Microsoft today issued security updates to fix at least 56 vulnerabilities in its Windows operating systems and supported software, including two zero-day flaws that are being actively exploited.

All supported Windows operating systems will receive an update this month for a buffer overflow vulnerability that carries the catchy name CVE-2025-21418. This patch should be a priority for enterprises, as Microsoft says it is being exploited, has low attack complexity, and no requirements for user interaction.

Tenable senior staff research engineer Satnam Narang noted that since 2022, there have been nine elevation of privilege vulnerabilities in this same Windows component — three each year — including one in 2024 that was exploited in the wild as a zero day (CVE-2024-38193).

“CVE-2024-38193 was exploited by the North Korean APT group known as Lazarus Group to implant a new version of the FudModule rootkit in order to maintain persistence and stealth on compromised systems,” Narang said. “At this time, it is unclear if CVE-2025-21418 was also exploited by Lazarus Group.”

The other zero-day, CVE-2025-21391, is an elevation of privilege vulnerability in Windows Storage that could be used to delete files on a targeted system. Microsoft’s advisory on this bug references something called “CWE-59: Improper Link Resolution Before File Access,” says no user interaction is required, and that the attack complexity is low.

Adam Barnett, lead software engineer at Rapid7, said although the advisory provides scant detail, and even offers some vague reassurance that ‘an attacker would only be able to delete targeted files on a system,’ it would be a mistake to assume that the impact of deleting arbitrary files would be limited to data loss or denial of service.

“As long ago as 2022, ZDI researchers set out how a motivated attacker could parlay arbitrary file deletion into full SYSTEM access using techniques which also involve creative misuse of symbolic links,”Barnett wrote.

One vulnerability patched today that was publicly disclosed earlier is CVE-2025-21377, another weakness that could allow an attacker to elevate their privileges on a vulnerable Windows system. Specifically, this is yet another Windows flaw that can be used to steal NTLMv2 hashes — essentially allowing an attacker to authenticate as the targeted user without having to log in.

According to Microsoft, minimal user interaction with a malicious file is needed to exploit CVE-2025-21377, including selecting, inspecting or “performing an action other than opening or executing the file.”

“This trademark linguistic ducking and weaving may be Microsoft’s way of saying ‘if we told you any more, we’d give the game away,'” Barnett said. “Accordingly, Microsoft assesses exploitation as more likely.”

The SANS Internet Storm Center has a handy list of all the Microsoft patches released today, indexed by severity. Windows enterprise administrators would do well to keep an eye on askwoody.com, which often has the scoop on any patches causing problems.

It’s getting harder to buy Windows software that isn’t also bundled with Microsoft’s flagship Copilot artificial intelligence (AI) feature. Last month Microsoft started bundling Copilot with Microsoft Office 365, which Redmond has since rebranded as “Microsoft 365 Copilot.” Ostensibly to offset the costs of its substantial AI investments, Microsoft also jacked up prices from 22 percent to 30 percent for upcoming license renewals and new subscribers.

Office-watch.com writes that existing Office 365 users who are paying an annual cloud license do have the option of “Microsoft 365 Classic,” an AI-free subscription at a lower price, but that many customers are not offered the option until they attempt to cancel their existing Office subscription.

In other security patch news, Apple has shipped iOS 18.3.1, which fixes a zero day vulnerability (CVE-2025-24200) that is showing up in attacks.

Adobe has issued security updates that fix a total of 45 vulnerabilities across InDesign, Commerce, Substance 3D Stager, InCopy, Illustrator, Substance 3D Designer and Photoshop Elements.

Chris Goettl at Ivanti notes that Google Chrome is shipping an update today which will trigger updates for Chromium based browsers including Microsoft Edge, so be on the lookout for Chrome and Edge updates as we proceed through the week.

Image: Shutterstock, Dreamansions.

KrebsOnSecurity.com turns 15 years old today! Maybe it’s indelicate to celebrate the birthday of a cybercrime blog that mostly publishes bad news, but happily many of 2024’s most engrossing security stories were about bad things happening to bad guys. It’s also an occasion to note that despite my publishing fewer stories than ever this past year, we somehow managed to attract near record levels of readership (thank you!).

In case you missed any of them, here’s a recap of 2024’s most-read stories. In January, KrebsOnSecurity told the story of a Canadian man who was falsely charged with larceny and lost his job after becoming the victim of a complex e-commerce scam known as triangulation fraud. This can occur when you buy something online — from a seller on Amazon or eBay, for example — but the seller doesn’t actually own the item for sale. Instead, they purchase the item using stolen payment card data and your shipping address. In this scam, you receive what you ordered, and the only party left to dispute the transaction is the owner of the stolen payment card.

Triangulation fraud. Image: eBay Enterprise.

March featured several investigations into the history of various people-search data broker services. One story exposed how the Belarusian CEO of the privacy and data removal service OneRep had actually founded dozens of people-search services, including many that OneRep was offering to remove people from for a fee. That story quickly prompted Mozilla to terminate its partnership with OneRep, which Mozilla had bundled as a privacy option for Firefox users.

A story digging into the consumer data broker Radaris found its CEO was a fabricated identity, and that the company’s founders were Russian brothers in Massachusetts who operated multiple Russian language dating services and affiliate programs, in addition to a dizzying array of people-search websites.

Radaris repeatedly threatened to sue KrebsOnSecurity unless that publication was retracted in full, alleging that it was replete with errors both factual and malicious. Instead, we doubled down and published all of the supporting evidence that wasn’t included in the original story, leaving little room for doubt about its conclusions. Fittingly, Radaris now pimps OneRep as a service when consumers request that their personal information be removed from the data broker’s website.

Easily the longest story this year was an investigation into Stark Industries Solutions, a large, mysterious new Internet hosting firm that materialized when Russia invaded Ukraine. That piece revealed how Stark was being used as a global proxy network to conceal the true source of cyberattacks and disinformation campaigns against enemies of Russia.

The homepage of Stark Industries Solutions.

Much of my summer was spent reporting a story about how advertising and marketing firms have created a global free-for-all where anyone can track the daily movements and associations of hundreds of millions of mobile devices, thanks to the ubiquity of mobile location data that is broadly and cheaply available.

Research published in September explored the dark nexus between harm groups and cybercrime communities consumed with perpetrating financial fraud. That analysis found an increasing number of young, Western cybercriminals are also members of fast-growing online groups that exist solely to bully, stalk, harass and extort vulnerable teens into physically harming themselves and others.

One focus of that story was a Canadian cybercriminal who used the nickname Judische. Identified by the Mandiant as one of the most consequential threat actors of 2024, Judische was responsible for a hacking rampage that exposed private information on hundreds of millions of Americans.  That story withheld Judische’s real name, but the reporting came in handy in late October when a 25-year-old Canadian man named Connor Riley Moucka was arrested and charged with 20 criminal counts connected to the Snowflake data extortions.

A surveillance photo of Connor Riley Moucka, a.k.a. “Judische” and “Waifu,” dated Oct 21, 2024, 9 days before Moucka’s arrest. This image was included in an affidavit filed by an investigator with the Royal Canadian Mounted Police (RCMP).

In November, KrebsOnSecurity published a profile of Judische’s accomplice — a hacker known as Kiberphant0m — detailing how Kiberphant0m had left a trail of clues strongly suggesting that they are or recently were a U.S. Army soldier stationed in South Korea.

My reporting in December was mainly split between two investigations. The first profiled Cryptomus, a dodgy cryptocurrency exchange allegedly based in Canada that has become a major payment processor and sanctions evasion platform for dozens of Russian exchanges and cybercrime services online.

How to Lose a Fortune with Just One Bad Click told the sad tales of two cryptocurrency heist victims who were scammed out of six and seven figures after falling for complex social engineering schemes over the phone. In these attacks, the phishers abused at least four different Google services to trick targets into believing they were speaking with a Google representative, and into giving thieves control over their account with a single click. Look for a story here in early 2025 that will explore the internal operations of these ruthless and ephemeral voice phishing gangs.

Before signing off for 2024, allow me to remind readers that the reporting we’re able to provide here is made possible primarily by the ads you may see at the top of this website. If you currently don’t see any ads when you load this website, please consider enabling an exception in your ad blocker for KrebsOnSecurity.com. There is zero third-party content on this website, apart from the occasional Youtube video embedded as part of a story. More importantly, all of our ads are static images or GIFs that are vetted by me and served in-house directly.

Fundamentally, my work is supported and improved by your readership, tips, encouragement and, yes, criticism. So thank you for that, and keep it coming, please.

Here’s to a happy, healthy, wealthy and wary 2025. Hope to see you all again in the New Year!

A 10-year-old boy's parents said he is fighting hard in recovery after he was injured during Friday's plane crash in Northeast Philadelphia.

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