Sitecore "thumbnailsaccesstoken" Deserialization Scans (and some new reports) CVE-2025-27218
Our honeypots detected a deserialization attack against the CMS Sitecore using a thumnailaccesstoken header. The underlying vulnerability was patched in January, and security firm Searchlight Cyber revealed details about this vulnerability a couple of weeks ago.
https://isc.sans.edu/diary/Sitecore%20%22thumbnailsaccesstoken%22%20Deserialization%20Scans%20%28and%20some%20new%20reports%29%20CVE-2025-27218/31806
Blasting Past Webp
Google s Project Zero revealed details how the NSO BLASTPASS exploit took advantage of a Webp image parsing vulnerability in iOS. This zero-click attack was employed in targeted attack back in 2023 and Apple patched the underlying vulnerability in September 2023. But this is the first byte by byte description showing how the attack worked.
https://googleprojectzero.blogspot.com/2025/03/blasting-past-webp.html
Splunk Vulnerabilities
Splunk patched about a dozen of vulnerabilities. None of them are rated critical, but a vulnerability rated High allows authenticated users to execute arbitrary code.
https://advisory.splunk.com/
Firefox 0-day Patched
Mozilla patched a sandbox escape vulnerability that is already being exploited.
https://www.mozilla.org/en-US/security/advisories/mfsa2025-19/

Leveraging CNNs and Entropy-Based Feature Selection to Identify Potential Malware Artifacts of Interest
This diary explores a novel methodology for classifying malware by integrating entropy-driven feature selection with a specialized Convolutional Neural Network (CNN). Motivated by the increasing obfuscation tactics used by modern malware authors, we will focus on capturing high-entropy segments within files, regions most likely to harbor malicious functionality, and feeding these distinct byte patterns into our model.
https://isc.sans.edu/diary/%5BGuest%20Diary%5D%20Leveraging%20CNNs%20and%20Entropy-Based%20Feature%20Selection%20to%20Identify%20Potential%20Malware%20Artifacts%20of%20Interest/31790

Malware found on npm infecting local package with reverse shell
Researchers at Reversinglabs found two malicious NPM packages, ethers-provider2, and ethers-providerz that patch the well known (and not malicious) ethers package to add a reverse shell and downloader.
https://www.reversinglabs.com/blog/malicious-npm-patch-delivers-reverse-shell
Google Patched Google Chrome 0-day
Google patched a vulnerability in Chrome that was already exploited in attacks against media and educational organizations in Russia
https://chromereleases.googleblog.com/2025/03/stable-channel-update-for-desktop_25.html

XWiki Search Vulnerablity Exploit Attempts (CVE-2024-3721)
Our honeypot detected an increase in exploit attempts for an XWiki command injection vulnerablity. The vulnerability was patched last April, but appears to be exploited more these last couple days. The vulnerability affects the search feature and allows the attacker to inject Groovy code templates.
https://isc.sans.edu/diary/X-Wiki%20Search%20Vulnerability%20exploit%20attempts%20%28CVE-2024-3721%29/31800
Correction: FBI Image Converter Warning
The FBI's Denver office warned of online file converters, not downloadable conversion tools
https://www.fbi.gov/contact-us/field-offices/denver/news/fbi-denver-warns-of-online-file-converter-scam
VMWare Vulnerability
Broadcom released a fix for a VMWare Tools vulnerability. The vulnerability allows users of a Windows virtual machine to escalate privileges within the machine.
https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/25518
Draytek Reboots
Over the weekend, users started reporting Draytek routers rebooting and getting stuck in a reboot loop. Draytek now published advise as to how to fix the problem.
https://faq.draytek.com.au/docs/draytek-routers-rebooting-how-to-solve-this-issue/
Microsoft Managemnt Console Exploit CVE-2025-26633
TrendMicro released details showing how the MMC vulnerability Microsoft patched as part of its patch tuesday this month was exploited.
https://www.trendmicro.com/en_us/research/25/c/cve-2025-26633-water-gamayun.html

Privacy Aware Bots
A botnet is using privacy as well as CSRF prevention headers to better blend in with normal browsers. However, in the process they may make it actually easier to spot them.
https://isc.sans.edu/diary/Privacy%20Aware%20Bots/31796
Critical Ingress Nightmare Vulnerability
ingress-nginx fixed four new vulnerabilities, one of which may lead to a Kubernetes cluster compromise. Note that at the time I am making this live, not all of the URLs below are available yet, but I hope they will be available shortly after publishing this podcast
https://www.darkreading.com/application-security/critical-ingressnightmare-vulns-kubernetes-environments
https://www.wiz.io/blog/ingress-nginx-kubernetes-vulnerabilities
https://kubernetes.io/blog/
FBI Warns of File Converter Scams
File converters may include malicious ad ons. Be careful where you get your software from.
https://www.fbi.gov/contact-us/field-offices/denver/news/fbi-denver-warns-of-online-file-converter-scam
VSCode Extension Includes Ransomware
https://x.com/ReversingLabs/status/1902355043065500145

Critical Next.js Vulnerability CVE-2025-29927
A critical vulnerability in how the x-middleware-subrequest header is verified may lead to bypassing authorization in Next.js applications.
https://zhero-web-sec.github.io/research-and-things/nextjs-and-the-corrupt-middleware
https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw
https://www.runzero.com/blog/next-js/
Microsoft Trust Signing Service Abused
Attackers abut the Microsoft Trust Signing Service, a service meant to help developers create signed software, to obtain short lived signatures for malware.
https://www.bleepingcomputer.com/news/security/microsoft-trust-signing-service-abused-to-code-sign-malware/

Some New Data Feeds and Little Incident
We started offering additional data feeds, and an SEO spamer attempted to make us change a link from an old podcast episode.
https://isc.sans.edu/diary/Some%20new%20Data%20Feeds%2C%20and%20a%20little%20%22incident%22./31786
Veeam Deserialization Vulnerability
Veeam released details regarding the latest vulnerablity in Veeam, pointing out the insufficient patch applied to a prior deserialization vulnerability.
https://labs.watchtowr.com/by-executive-order-we-are-banning-blacklists-domain-level-rce-in-veeam-backup-replication-cve-2025-23120/
IBM AIX Vulnerablity
The AIX NIM service is vulnerable to an unauthenticated remote code execution vulnerability
https://www.ibm.com/support/pages/node/7186621
thanks Chris Mosby for Spotify comment

Exploit Attempts for Cisco Smart Licensing Utility CVE-2024-20439 CVE-2024-20440
Attackers added last September's Cisco Smart Licensing Utility vulnerability to their toolset. These attacks orginate most likely from botnets and the same attackers are scanning for a wide range of additional vulnerabilities. The vulnerability is a static credential issue and trivial to exploit after the credentials were published last fall.
https://isc.sans.edu/diary/Exploit%20Attempts%20for%20Cisco%20Smart%20Licensing%20Utility%20CVE-2024-20439%20and%20CVE-2024-20440/31782
Legacy Driver Exploitation Through Bypassing Certificate Verification
Ahnlab documented a new type of "bring your own vulnerable driver" vulnerability. In this case, an old driver used by an anit-malware and anti-rootkit system can be used to shut down arbitrary processeses, including security related processeses.
https://asec.ahnlab.com/en/86881/
Synology Vulnerability Updates
Synology updates some security advisories it release last year adding addition details and vulnerable systems.
https://www.synology.com/en-global/security/advisory/Synology_SA_24_20
https://www.synology.com/en-global/security/advisory/Synology_SA_24_24

Python Bot Delivered Through DLL Side-Loading
A "normal", but vulnerable to DLL side-loading PDF reader may be used to launch additional exploit code
https://isc.sans.edu/diary/Python%20Bot%20Delivered%20Through%20DLL%20Side-Loading/31778
Tomcat RCE Correction
To exploit the Tomcat RCE I mentioned yesterday, two non-default configuration options must be selected by the victim.
https://x.com/dkx02668274/status/1901893656316969308
SAML Roulette: The Hacker Always Wins
This Portswigger blog explains in detail how to exploit the ruby-saml vulnerablity against GitLab.
https://portswigger.net/research/saml-roulette-the-hacker-always-wins
Windows Shortcut Zero Day Exploit
Attackers are currently taking advantage of an unpatched vulnerability in how Windows displays Shortcut (.lnk file) details. Trendmicro explains how the attack works and provides PoC code. Microsoft is not planning to fix this issue
https://www.trendmicro.com/en_us/research/25/c/windows-shortcut-zero-day-exploit.html

Static Analysis of GUID Encoded Shellcode
Didier explains how to decode shell code embeded as GUIDs in malware, and how to feed the result to his tool 1768.py which will extract Cobal Strike configuration information from the code.
https://isc.sans.edu/diary/Static%20Analysis%20of%20GUID%20Encoded%20Shellcode/31774
SAMLStorm: Critical Authentication Bypass in xml-crypto and Node.js libraries
xml-crypto, a library use in Node.js applications to decode XML and support SAML, has found to parse comments incorrectly leading to several SAML vulnerabilities.
https://workos.com/blog/samlstorm
One PUT Request to Own Tomcat: CVE-2025-24813 RCE is in the Wild
A just made public deserialization vulnerablity in Tomcat is already being exploited. Contributing to the rapid exploit release is the similarity of this vulnerability to other Java deserializtion vulnerabilities.
https://lab.wallarm.com/one-put-request-to-own-tomcat-cve-2025-24813-rce-is-in-the-wild/ CVE-2025-24813
CSS Abuse for Evasion and Tracking
Attackers are using cascading stylesheets to evade detection and enable more stealthy tracking of users
https://blog.talosintelligence.com/css-abuse-for-evasion-and-tracking/

Mirai Bot Now Incorporating Malformed DrayTek Vigor Router Exploits
One of the many versions of the Mirai botnet added some new exploit strings attempting to take advantage of an old DrayTek Vigor Router vulnerability, but they got the URL wrong.
https://isc.sans.edu/diary/Mirai%20Bot%20now%20incroporating%20%28malformed%3F%29%20DrayTek%20Vigor%20Router%20Exploits/31770
Compromised GitHub Action
The popular GitHub action tj-actions/changed-files was compromised and leaks credentials via the action logs
https://www.stepsecurity.io/blog/harden-runner-detection-tj-actions-changed-files-action-is-compromised
ruby-saml authentication bypass
A confusion in how to parse SAML messages between two XML parsers used by Ruby leads to an authentication bypass in saml-ruby.
https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials/
GitHub Fake Security Alerts
Fake GitHub security alerts are used to trick package maintainers into adding OAUTH privileges to malicious apps.
https://www.bleepingcomputer.com/news/security/fake-security-alert-issues-on-github-use-oauth-app-to-hijack-accounts/