Security

Highly Invasive Backdoors Hidden in Python Obfuscation Packages, Downloaded by 2,348 Developers (arstechnica.com) 50

The senior security editor at Ars Technica writes: Highly invasive malware targeting software developers is once again circulating in Trojanized code libraries, with the latest ones downloaded thousands of times in the last eight months, researchers said Wednesday.

Since January, eight separate developer tools have contained hidden payloads with various nefarious capabilities, security firm Checkmarx reported. The most recent one was released last month under the name "pyobfgood." Like the seven packages that preceded it, pyobfgood posed as a legitimate obfuscation tool that developers could use to deter reverse engineering and tampering with their code. Once executed, it installed a payload, giving the attacker almost complete control of the developerâ(TM)s machine. Capabilities include:


- Exfiltrate detailed host information
- Steal passwords from the Chrome web browser
- Set up a keylogger
- Download files from the victim's system
- Capture screenshots and record both screen and audio
- Render the computer inoperative by ramping up CPU usage, inserting a batch script in the startup directory to shut down the PC, or forcing a BSOD error with a Python script
- Encrypt files, potentially for ransom
- Deactivate Windows Defender and Task Manager
- Execute any command on the compromised host


In all, pyobfgood and the previous seven tools were installed 2,348 times. They targeted developers using the Python programming language... Downloads of the package came primarily from the US (62%), followed by China (12%) and Russia (6%)

Ars Technica concludes that "The never-ending stream of attacks should serve as a cautionary tale underscoring the importance of carefully scrutinizing a package before allowing it to run."
Security

NY AG Issues $450K Penalty To US Radiology After Unpatched Bug Led To Ransomware (therecord.media) 25

An anonymous reader quotes a report from The Record: One of the nation's largest private radiology companies agreed to pay a $450,000 fine after a 2021 ransomware attack led to the exposure of sensitive information from nearly 200,000 patients. In an agreement announced on Wednesday, New York Attorney General Letitia James said US Radiology failed to remediate a vulnerability announced by security company SonicWall in January 2021. US Radiology used the company's firewall to protect its network and provide managed services for many of its partner companies, including the Windsong Radiology Group, which has six facilities across Western New York.

The vulnerability highlighted by the attorney general -- CVE-2021-20016 -- was used by ransomware gangs in several attacks. US Radiology was unable to install the firmware patch for the zero-day because its SonicWall hardware was at an end-of-life stage and was no longer supported. The company planned to replace the hardware in July 2021, but the project was delayed "due to competing priorities and resource restraints." The vulnerability was never addressed, and the company was attacked by an unnamed ransomware gang on December 8, 2021.

An investigation determined that the hacker was able to gain access to files that included the names, dates of birth, patient IDs, dates of service, provider names, types of radiology exams, diagnoses and/or health insurance ID numbers of 198,260 patients. The data exposed during the incident also included driver's license numbers, passport numbers, and Social Security numbers for 82,478 New Yorkers. [...] In addition to the $450,000 penalty, the company will have to upgrade its IT network, hire someone to manage its data security program, encrypt all sensitive patient information and develop a penetration testing program. The company will have to delete patient data "when there is no reasonable business purpose to retain it" and submit compliance reports to the state for two years.
"When patients visit a medical facility, they deserve confidence in knowing that their personal information will not be compromised when they are receiving care," said Attorney General James. "US Radiology failed to protect New Yorkers' data and was vulnerable to attack because of outdated equipment. In the face of increasing cyberattacks and more sophisticated scams to steal private data, I urge all companies to make necessary upgrades and security fixes to their computer hardware and systems."
IT

How a Tiny Pacific Island Became the Global Capital of Cybercrime (technologyreview.com) 18

Despite having a population of just 1,400, until recently, Tokelau's .tk domain had more users than any other country. Here's why: Tokelau, a necklace of three isolated atolls strung out across the Pacific, is so remote that it was the last place on Earth to be connected to the telephone-- only in 1997. Just three years later, the islands received a fax with an unlikely business proposal that would change everything. It was from an early internet entrepreneur from Amsterdam, named Joost Zuurbier. He wanted to manage Tokelau's country-code top-level domain, or ccTLD -- the short string of characters that is tacked onto the end of a URL. Up until that moment, Tokelau, formally a territory of New Zealand, didn't even know it had been assigned a ccTLD. "We discovered the .tk," remembered Aukusitino Vitale, who at the time was general manager of Teletok, Tokelau's sole telecom operator.

Zuurbier said "that he would pay Tokelau a certain amount of money and that Tokelau would allow the domain for his use," remembers Vitale. It was all a bit of a surprise -- but striking a deal with Zuurbier felt like a win-win for Tokelau, which lacked the resources to run its own domain. In the model pioneered by Zuurbier and his company, now named Freenom, users could register a free domain name for a year, in exchange for having advertisements hosted on their websites. If they wanted to get rid of ads, or to keep their website active in the long term, they could pay a fee.

In the succeeding years, tiny Tokelau became an unlikely internet giant -- but not in the way it may have hoped. Until recently, its .tk domain had more users than any other country's: a staggering 25 million. But there has been and still is only one website actually from Tokelau that is registered with the domain: the page for Teletok. Nearly all the others that have used .tk have been spammers, phishers, and cybercriminals. Everyone online has come across a .tk -- even if they didn't realize it. Because .tk addresses were offered for free, unlike most others, Tokelau quickly became the unwitting host to the dark underworld by providing a never-ending supply of domain names that could be weaponized against internet users. Scammers began using .tk websites to do everything from harvesting passwords and payment information to displaying pop-up ads or delivering malware.

IT

How SIM Swappers Straight-Up Rob T-Mobile Stores (404media.co) 70

An anonymous reader shares a report: A young man sits in a car, pointing a cellphone camera out of the window, seemingly trying to remain undetected. As he breathes heavily in anticipation, he peers at a T-Mobile store across the road from where he is parked.

Suddenly, there is some commotion inside. An accomplice grabs something off a table where a T-Mobile employee is sitting. The accomplice, dressed in a mask and black baseball cap, then bursts out of the store and clumsily sprints towards the car. The man in the vehicle starts laughing, then giggling uncontrollably like a child. The pair got what they came for: a T-Mobile employee's tablet, the sort workers use everyday when dealing with customer support issues or setting up a new phone.

To the people in the car, what this tablet is capable of is much more valuable than iPad hardware itself. The tablet lets them essentially become T-Mobile. It can grant them the ability to take over target phone numbers, and redirect any text messages or calls for the victim to the hacker's own device, as part of a hack called a SIM swap. From there, they can easily break into email, cryptocurrency, and social media accounts.

Microsoft

Microsoft Briefly Restricted Employee Access To OpenAI's ChatGPT, Citing Security Concerns (cnbc.com) 5

Microsoft has invested billions of dollars in OpenAI. But for a brief time on Thursday, employees of the software company weren't allowed to use the startup's most famous product, ChatGPT, CNBC reported. From a report: "Due to security and data concerns a number of AI tools are no longer available for employees to use," Microsoft said in an update on an internal website. "While it is true that Microsoft has invested in OpenAI, and that ChatGPT has built-in safeguards to prevent improper use, the website is nevertheless a third-party external service," Microsoft said. "That means you must exercise caution using it due to risks of privacy and security. This goes for any other external AI services, such as Midjourney or Replika, as well."

The company initially said it was banning ChatGPT and design software Canva, but later removed a line in the advisory that included those products. After initial publication of this story, Microsoft reinstated access to ChatGPT. In a statement to CNBC, Microsoft said the ChatGPT temporary blockage was a mistake resulting from a test of systems for large language models. "We were testing endpoint control systems for LLMs and inadvertently turned them on for all employees," a spokesperson said. "We restored service shortly after we identified our error. As we have said previously, we encourage employees and customers to use services like Bing Chat Enterprise and ChatGPT Enterprise that come with greater levels of privacy and security protections."

Security

Cyber Attack Forces World's Biggest Bank to Trade via USB Stick (time.com) 14

An anonymous reader shares a report: On Thursday, trades handled by the world's largest bank in the globe's biggest market traversed Manhattan on a USB stick. Industrial & Commercial Bank of China's U.S. unit had been hit by a cyberattack, rendering it unable to clear swathes of U.S. Treasury trades after entities responsible for settling the transactions swiftly disconnected from the stricken systems. That forced ICBC to send the required settlement details to those parties by a messenger carrying a thumb drive as the state-owned lender raced to limit the damage.

The workaround -- described by market participants -- followed the attack by suspected perpetrator Lockbit, a prolific criminal gang with ties to Russia that has also been linked to hits on Boeing, ION Trading U.K. and the U.K.'s Royal Mail. The strike caused immediate disruption as market-makers, brokerages and banks were forced to reroute trades, with many uncertain when access would resume. The incident spotlights a danger that bank leaders concede keeps them up at night -- the prospect of a cyber attack that could someday cripple a key piece of the financial system's wiring, setting off a cascade of disruptions. Even brief episodes prompt bank leaders and their government overseers to call for more vigilance.

Encryption

Signal Messaging App Now Testing Usernames (pcmag.com) 52

Michael Kan reports via PCMag: Encrypted messaging service Signal is now testing usernames, which will offer people a more private way to share their contact details on the app. Signal kicked off the public test today through a new beta build available in its community forums. "After rounds of internal testing, we have hit the point where we think the community that powers these forums can help us test even further before public launch," says Signal VP of Engineering Jim O'Leary.

The development is a big deal since Signal -- an end-to-end encrypted messaging app -- has long required users to sign up with a phone number. That same number also needs to be shared in order to message other users on the app. This can be problematic since sharing your phone number exposes you to privacy and hacking risks. For example, a contact on Signal could choose to call and message your number over an unencrypted cellular network or pass off the number to someone else.

Security

Maine Government Says Data Breach Affects 1.3 Million Residents (techcrunch.com) 40

An anonymous reader quotes a report from TechCrunch: The government of Maine has confirmed over a million state residents had personal information stolen in a data breach earlier this year by a Russia-linked ransomware gang. In a statement published Thursday, the Maine government said hackers exploited a vulnerability in its MOVEit file-transfer system, which stored sensitive data on state residents. The hackers used the vulnerability to access and download files belonging to certain state agencies between May 28 and May 29, the statement read. The Maine government said it was disclosing the incident and notifying affected residents as its assessment of the impacted files "was recently completed."

Maine said that the stolen information may include a person's name, date of birth, Social Security number, driver's license and other state or taxpayer identification numbers. Some individuals had medical and health insurance information taken. The statement said the state holds information about residents "for various reasons, such as residency, employment, or interaction with a state agency," and that the data it holds varies by person. According to the state's breakdown of which agencies are affected, more than half of the stolen data relates to Maine's Department of Health and Human Services, with up to about a third of the data affecting the Maine's Department of Education. The remaining data affects various other agencies, including Maine's Bureau of Motor Vehicles and Maine's Department of Corrections, though the government notes that the breakdown of information is subject to change. More than 1.3 million people live in the state of Maine, according to the U.S. Census Bureau.

Security

Mortgage Giant Mr. Cooper Shuts Down Systems Following Cyberattack (securityweek.com) 30

An anonymous reader quotes a report from SecurityWeek: Mortgage giant Mr. Cooper on Thursday announced that it has shut down certain systems after falling victim to a cyberattack, which resulted in its operations being suspended. The attack occurred on October 31 and prompted an immediate response, including containment measures that involved taking down some systems. The shutdown, the company says in an incident notice on its website, prevents it from processing customer payments temporarily, but such operations will resume as soon as systems are restored. Mr. Cooper says it is currently investigating the potential compromise of customer data, and that it will notify all those whose data might have been impacted by the attack. Headquartered in the Dallas, Texas, area, Mr. Cooper is one of the largest mortgage servicers in the US, with approximately 4.3 million customers. While it remains unclear what kind of cyberattack hit Mr. Cooper's systems, the mortgage and loan giant did confirm that customer data was compromised. However, banking information does not appear to be impacted. "Mr. Cooper does not store banking information related to mortgage payments on our systems. This information is hosted with a third-party provider and, based on the information we have to date, we do not believe it was affected by this incident," the company added.

According to TechCrunch, citing a filing with the U.S. Securities and Exchange Commission, Mr. Cooper said it "expects to incur up to $10 million in additional vendor costs during its fiscal fourth quarter, adding that it does not expect a material impact to its business."
AMD

AMD Begins Polaris and Vega GPU Retirement Process, Reduces Ongoing Driver Support (anandtech.com) 19

As AMD is now well into their third generation of RDNA architecture GPUs, the sun has been slowly setting on AMD's remaining Graphics Core Next (GCN) designs, better known by the architecture names of Polaris and Vega. From a report: In recent weeks the company dropped support for those GPU architectures in their open source Vulkan Linux driver, AMDVLK, and now we have confirmation that the company is slowly winding down support for these architectures in their Windows drivers as well. Under AMD's extended driver support schedule for Polaris and Vega, the drivers for these architectures will no longer be kept at feature parity with the RDNA architectures. And while AMD will continue to support Polaris and Vega for some time to come, that support is being reduced to security updates and "functionality updates as available."

For AMD users keeping a close eye on their driver releases, they'll likely recognize that AMD already began this process back in September -- though AMD hasn't officially documented the change until now. As of AMD's September Adrenaline 23.9 driver series, AMD split up the RDNA and GCN driver packages, and with that they have also split the driver branches between the two architectures. As a result, only RDNA cards are receiving new features and updates as part of AMD's mainline driver branch (currently 23.20), while the GCN cards have been parked on a maintenance driver branch - 23.19.

Cloud

Microsoft Won't Let You Close OneDrive on Windows Until You Explain Yourself (theverge.com) 245

Microsoft now wants you to explain exactly why you're attempting to close its OneDrive for Windows app before it allows you to do so. From a report: Neowin has spotted that the latest update to OneDrive now includes an annoying dialog box that asks you to select the reason why you're closing the app every single time you attempt to close OneDrive from the taskbar. Closing OneDrive is already buried away and not a simple task, with Microsoft hiding it under a "pause syncing" option when you right-click on OneDrive in the taskbar. But now, the quit option is grayed out until you select a reason for quitting OneDrive from a drop-down box. Here are the options:
1. I don't want OneDrive running all the time
2. I don't know what OneDrive is
3. I don't use OneDrive
4. I'm trying to fix a problem with OneDrive
5. I'm trying to speed up my computer
6. I get too many notifications
7. Other

Android

Google-led App Defense Alliance Joins Linux Foundation (techcrunch.com) 17

The App Defense Alliance (ADA), an initiative set up by Google back in 2019 to combat malicious Android apps infiltrating the Play app store, has joined the Joint Development Foundation (JDF), a Linux Foundation project focused on helping organizations working on technical specifications, standards, and related efforts. From a report: The App Defense Alliance had, in fact, already expanded beyond its original Android malware detection roots, covering areas such as malware mitigation, mobile app security assessments (MASA), and cloud app security assessments (CASA). And while its founding members included mobile security firms such as ESET, Lookout and Zimperium, it has ushered in new members through the years including Trend Micro and McAfee. Today's news, effectively, sees ADA join an independent foundation, a move designed to open up the appeal to other big tech companies, such as Facebook parent Meta and Microsoft, both of which are now joining the ADA's steering committee. The ultimate goal is to "improve app security" through fostering greater "collaborative implementation of industry standards," according to a joint statement today.
Chrome

Google Search and Chrome Are Getting New Tools To Help Users Find Discounts (techcrunch.com) 17

Google is coming for Honey and other deal-finding tools by introducing new features on Search and Chrome to help users find discounts. From a report: The tech giant announced on Tuesday that it's adding a designated page for deals on Search, while Chrome is getting features that proactively look for discount codes and provide users with price insights. The new deals search results page on Search is designed to help users find products that are on sale from across the web in one designated spot. The page will display deals in categories like apparel, electronics, toys and beauty. You'll also find deals from different types of merchants, including big box stores, DTC brands, luxury multi-brand retailers, designer labels and local stores.

Users can scroll through deals by category and also see popular stores that have deals on what you're looking for. If you see something you're interested in, you can click on the product or visit the merchant site to learn more. Google says that if you're signed into your Google account, the page will take into account what you usually like to shop. To access the new deals page, you need to search "shop deals." Or, if you're looking for something specific, you can search for categories like "shop sneaker deals."

United Kingdom

Tech Groups Fear New Powers Will Allow UK To Block Encryption (ft.com) 40

Tech groups have called on ministers to clarify the extent of proposed powers that they fear would allow the UK government to intervene and block the rollout of new privacy features for messaging apps. FT: The Investigatory Powers Amendment Bill, which was set out in the King's Speech on Tuesday, would oblige companies to inform the Home Office in advance about any security or privacy features they want to add to their platforms, including encryption. At present, the government has the power to force telecoms companies and messaging platforms to supply data on national security grounds and to help with criminal investigations.

The new legislation was designed to "recalibrate" those powers to respond to risks posed to public safety by multinational tech companies rolling out new services that "preclude lawful access to data," the government said. But Meredith Whittaker, president of private messaging group Signal, urged ministers to provide more clarity on what she described as a "bellicose" proposal amid fears that, if enacted, the new legislation would allow ministers and officials to veto the introduction of new safety features. "We will need to see the details, but what is being described suggests an astonishing level of technically confused government over-reach that will make it nearly impossible for any service, homegrown or foreign, to operate with integrity in the UK," she told the Financial Times.

Bug

Apple Delays Work on Next Year's iPhone, Mac Software To Fix Bugs (bloomberg.com) 74

In a rare move, Apple hit pause on development of next year's software updates for the iPhone, iPad, Mac and other devices so that it could root out glitches in the code. From a report: The delay, announced internally to employees last week, was meant to help maintain quality control after a proliferation of bugs in early versions, according to people with knowledge of the decision. Rather than adding new features, company engineers were tasked with fixing the flaws and improving the performance of the software, said the people, who asked not to be identified because the matter is private.

Apple's software -- famous for its clean interfaces, easy-to-use controls and focus on privacy -- is one of its biggest selling points. That makes quality control imperative. But the company has to balance a desire to add new features with making sure its operating systems run as smoothly as possible. [...] When looking at new operating systems due for release next year, the software engineering management team found too many "escapes" -- an industry term for bugs missed during internal testing. So the division took the unusual step of halting all new feature development for one week to work on fixing the bugs. With thousands of different Apple employees working on a range of operating systems and devices -- that need to work together seamlessly -- it's easy for glitches to crop up.

Crime

'Encryption King' Arrested In Turkey (404media.co) 31

An anonymous reader quotes a report from 404 Media: Hakan Ayik, an infamous drug trafficker who also popularized the use of certain brands of encrypted phones around the world, was arrested during a series of dramatic raids in Turkey last week. At one point a group of heavily armed Turkish tactical officers in brown and gray camouflage piled outside an apartment and banged on the door repeatedly. They then smashed the door down and moved inside with a riot shield, according to a video tweeted by Turkey's Minister of the Interior. The video then showed a photograph of Ayik, shirtless and on his knees while staring straight ahead, surrounded by multiple officers.

It was a moment that capped off the arrest of Australia's most wanted man, and a sign that Turkey is no longer a safe haven to organized criminals. But it was also something of a closing act on Anom, a brand of encrypted phone that the FBI secretly took over and managed for years after inserting a backdoor into the product, allowing agents to read tens of millions of messages sent across it. Ayik unknowingly helped the FBI gain that piercing insight into organized crime by selling the devices to other criminal associates. Given Ayik's position as a trusted authority on what communications tools drug traffickers should use, one associate even referred to him as the 'encryption king' in an Anom message I've seen.
According to the Sydney Morning Herald, Ayik will not be extradited to Australia. Instead, Australian police are encouraging Turkish authorities to investigate and prosecute him as a Turkish citizen.
Encryption

Scientist Claims Quantum RSA-2048 Encryption Cracking Breakthrough (tomshardware.com) 129

Mark Tyson reports via Tom's Hardware: A commercial smartphone or Linux computer can be used to crack RSA-2048 encryption, according to a prominent research scientist. Dr Ed Gerck is preparing a research paper with the details but couldn't hold off from bragging about his incredible quantum computing achievement (if true) on his LinkedIn profile. Let us be clear: the claims seem spurious, but it should be recognized that the world isn't ready for an off-the-shelf system that can crack RSA-2048, as major firms, organizations, and governments haven't yet transitioned to encryption tech that is secured for the post-quantum era.

In his social media post, Gerck states that a humble device like a smartphone can crack the strongest RSA encryption keys in use today due to a mathematical technique that "has been hidden for about 2,500 years -- since Pythagoras." He went on to make clear that no cryogenics or special materials were used in the RSA-2048 key-cracking feat. BankInfoSecurity reached out to Gerck in search of some more detailed information about his claimed RSA-2048 breakthrough and in the hope of some evidence that what is claimed is possible and practical. Gerck shared an abstract of his upcoming paper. This appears to show that instead of using Shor's algorithm to crack the keys, a system based on quantum mechanics was used, and it can run on a smartphone or PC.

In some ways, it is good that the claimed breakthrough doesn't claim to use Shor's algorithm. Alan Woodward, a professor of computer science at the University of Surrey, told BankInfoSecurity that no quantum computer in existence has enough gates to implement Shor's algorithm and break RSA-2048. So at least this part of Gerck's explanation checks out. However, the abstract of Gerck's paper looks like it is "all theory proving various conjectures - and those proofs are definitely in question," according to Woodward. The BankInfoSecurity report on Gerck's "QC Algorithms: Faster Calculation of Prime Numbers" paper quotes other skeptics, most of whom are waiting for more information and proofs before they organize a standing ovation for Gerck.

The Military

US Military Members' Personal Data Being Sold By Online Brokers, Report Finds 32

Jacob Knutson reports via Axios: Sensitive, highly detailed personal data for thousands of active-duty and veteran U.S. military members can be purchased for as little as one cent per name through data broker websites, according to a new study (PDF) published on Monday by Duke University researchers. [...] The data about military personnel purchased as part of the study included full names, physical and email addresses, health and financial information and details about their ethnicity, religious practices and political affiliation. In some cases, the information also included whether the person owned or rented a home, was married or had children. The children's ages and sexes were accessible, too.

The researchers bought data on up to around 45,000 military personnel for between $0.12 to $0.32 per record. They also bought data belonging to 5,000 friends and family members of military personnel. Larger data purchases of over 1.5 million service members were available for as little as $0.01 per record from at least one broker the researchers contacted. The researchers called on Congress to pass a comprehensive privacy law and for regulatory agencies like the Federal Trade Commission to develop rules to govern military personnel data purchases.
China

Huawei and Tencent Spearhead China's Hold on Cybersecurity Patents (nikkei.com) 28

China's presence is growing in cybersecurity technology, with companies such as Huawei and Tencent accounting for six of the top 10 global patent holdings in the sector as of August. From a report: Chinese companies have made headway in technological fields that affect economic security, according to industry insiders, as they focus on fostering their own tech amid the growing standoff between the U.S. and China. The rankings, compiled by Nikkei in cooperation with U.S. information services provider LexisNexis, are based on patents registered in 95 countries and regions, including Japan, the U.S., China and the European Union. Patent registrations were screened for the cybersecurity field using such factors as the international patent classification, with filings of the same patent in multiple countries counted as a single patent.

As of August, IBM led the rankings with 6,363 patents. Huawei Technologies came in second with 5,735 patents and Tencent Holdings placed third with 4,803. Other Chinese companies in the top 10 included financial services provider Ant Group in sixth with 3,922 patents, followed by power transmission company State Grid Corp. of China with 3,696, Alibaba Group Holding with 3,122 and sovereign wealth fund China Investment with 3,042. Patent applications filed by Chinese companies have increased since around 2018, when the U.S. began to impose full-scale export controls on Chinese high-tech companies. Compared with 10 years ago, IBM's patent holdings increased by a factor of 1.5. In contrast, holdings for Huawei and Tencent were 2.3 times and 13 times higher, respectively.

Microsoft

Microsoft Disputes Severity of Four Zero-Day Vulnerabilities Found in Exchange by Trend Micro (bleepingcomputer.com) 26

"Microsoft Exchange is impacted by four zero-day vulnerabilities that attackers can exploit remotely to execute arbitrary code or disclose sensitive information on affected installations," reports Bleeping Computer, citing disclosures Thursday from Trend Micro's Zero Day Initiative, who reported them to Microsoft on September 7th and 8th, 2023.

In an email to the site, a Microsoft spokesperson said customers who applied the August Security Updates are already protected from the first vulnerability, while the other three require attackers to have prior access to email credentials. (And for two of them no evidence was presented that it can be leveraged to gain elevation of privilege.)

"We've reviewed these reports and have found that they have either already been addressed, or do not meet the bar for immediate servicing under our severity classification guidelines and we will evaluate addressing them in future product versions and updates as appropriate."

From Bleeping Computer's report: ZDI disagreed with this response and decided to publish the flaws under its own tracking IDs to warn Exchange admins about the security risks... All these vulnerabilities require authentication for exploitation, which reduces their severity CVSS rating to between 7.1 and 7.5... It should be noted, though, that cybercriminals have many ways to obtain Exchange credentials, including brute-forcing weak passwords, performing phishing attacks, purchasing them, or acquiring them from info-stealer logs...

ZDI suggests that the only salient mitigation strategy is to restrict interaction with Exchange apps. However, this can be unacceptably disruptive for many businesses and organizations using the product. We also suggest implementing multi-factor authentication to prevent cybercriminals from accessing Exchange instances even when account credentials have been compromised.

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