Web Scanning SonicWall for CVE-2021-20016 - Update
Scans for SonicWall increased by an order of magnitude over the last couple of weeks. Many of the attacks appear to originate from Global Host , a low-cost virtual hosting provider.
https://isc.sans.edu/diary/Web%20Scanning%20SonicWall%20for%20CVE-2021-20016%20-%20Update/31952
Google Update Patches Exploited Chrome Flaw
Google released an update for Chrome. The update fixes two specific flaws reported by external researchers, CVE-2025-4664 and CVE-2025-4609. The first flaw is already being exploited in the wild.
https://chromereleases.googleblog.com/2025/05/stable-channel-update-for-desktop_14.html
https://x.com/slonser_/status/1919439373986107814
RVTools Bumblebee Malware Attack
Zerodaylabs published its analysis of the RV-Tools Backdoor attack. It suggests that this may not be solely a search engine optimization campaign directing victims to the malicious installer, but that the RVTools distribution site was compromised.
https://zerodaylabs.net/rvtools-bumblebee-malware/
Operation RoundPress
ESET Security wrote up a report summarizing recent XSS attacks against open-source webmail systems
https://www.welivesecurity.com/en/eset-research/operation-roundpress/

Another day, another phishing campaign abusing google.com open redirects
Google s links from it s maps page to hotel listings do suffer from an open redirect vulnerability that is actively exploited to direct users to phishing pages.
https://isc.sans.edu/diary/Another%20day%2C%20another%20phishing%20campaign%20abusing%20google.com%20open%20redirects/31950
Adobe Patches
Adobe patched 12 different applications. Of particular interest is the update to ColdFusion, which fixes several arbitrary code execution and arbitrary file read problems.
https://helpx.adobe.com/security/security-bulletin.html
Samsung Patches magicInfo 9 Again
Samsung released a new patch for the already exploited magicInfo 9 CMS vulnerability. While the description is identical to the patch released last August, a new CVE number is used.
https://security.samsungtv.com/securityUpdates#SVP-MAY-2025
Ivanti Patches Critical Ivanti Neurons Flaw
Ivanti released a patch for Ivanti Neurons for ITSM (on-prem only) fixing a critical authentication bypass vulnerability. Ivanti also points to its guidance to secure the underlying IIS server to make exploitation of flaws like this more difficult

Microsoft Patch Tuesday
Microsoft patched 70-78 vulnerabilities (depending on how you count them). Five of these vulnerabilities are already being exploited. In particular, a remote code execution vulnerability in the scripting engine should be taken seriously. It requires the Microsoft Edge browser to run in Internet Explorer mode.
https://isc.sans.edu/diary/Microsoft%20Patch%20Tuesday%3A%20May%202025/31946
Security Advisory Ivanti Endpoint Manager Mobile (EPMM) May 2025 (CVE-2025-4427 and CVE-2025-4428)
Ivanti patched an authentication bypass vulnerability and a remote code execution vulnerability. The authentication bypass can exploit the remote code execution vulnerability without authenticating first.
https://forums.ivanti.com/s/article/Security-Advisory-Ivanti-Endpoint-Manager-Mobile-EPMM?language=en_US
Fortinet Patches Exploited Vulnerability in API (CVE-2025-32756)
Fortinet patched an already exploited stack-based buffer overflow vulnerability in the API of multiple Fortinet products. The vulnerability is exploited via crafted HTTP requests.
https://fortiguard.fortinet.com/psirt/FG-IR-25-254

Apple Updates Everything
Apple patched all of its operating systems. This update ports a patch for a recently exploited vulnerability to older versions of iOS and macOS.
https://isc.sans.edu/diary/31942
It Is 2025, And We Are Still Dealing With Default IoT Passwords And Stupid 2013 Router Vulnerabilities
Versions of the Mirai botnet are attacking devices made by Unipi Technology. These devices are using a specific username and password combination. In addition, this version of the Mirai botnet will also attempt exploits against an old Netgear vulnerability.
https://isc.sans.edu/diary/It%20Is%202025%2C%20And%20We%20Are%20Still%20Dealing%20With%20Default%20IoT%20Passwords%20And%20Stupid%202013%20Router%20Vulnerabilities/31940
Output Messenger Vulnerability
The internal messenger application Output Messenger is currently used in sophisticated attacks. Attackers are exploiting a path traversal vulnerability that has not been fixed.
https://www.outputmessenger.com/cve-2025-27920/
Commvault Correction
Commvault s patch indeed fixes the recent vulnerability. The Pioneer Release Will Dormann used to experiment will only offer patches after it has been registered, which leads to an error when assessing the patch s efficacy.
https://www.darkreading.com/application-security/commvault-patch-works-as-intended

Steganography Challenge
Didier revealed the solution to last weekend s cryptography challenge. The image used the same encoding scheme as Didier described before, but the columns and rows were transposed.
https://isc.sans.edu/forums/diary/Steganography%20Challenge%3A%20My%20Solution/31912/
FBI Warns of End-of-life routers
The FBI is tracking larger botnets taking advantage of unpatched routers. Many of these routers are end-of-life, and no patches are available for the exploited vulnerabilities. The attackers are turning the devices into proxies, which are resold for various criminal activities.
https://www.ic3.gov/PSA/2025/PSA250507
ASUS Driverhub Vulnerability
ASUS Driverhub software does not properly check the origin of HTTP requests, allowing a CSRF attack from any website leading to arbitrary code execution.
https://mrbruh.com/asusdriverhub/
RV-Tools SEO Poisoning
Varonis Threat Labs observed SEO poisoning being used to trick system administrators into installing a malicious version of RV Tools. The malicious version includes a remote access tool leading to the theft of credentials
https://www.varonis.com/blog/seo-poisoning#initial-access-and-persistence

No Internet Access: SSH to the Rescue
If faced with restrictive outbound network access policies, a single inbound SSH connection can quickly be turned into a tunnel or a full-blown VPN
https://isc.sans.edu/diary/No%20Internet%20Access%3F%20SSH%20to%20the%20Rescue!/31932
SAMSUNG magicINFO 9 Server Flaw Still exploitable
The SAMSUNG magicINFO 9 Server Vulnerability we found being exploited last week is apparently still not completely patched, and current versions are vulnerable to the exploit observed in the wild.
https://www.huntress.com/blog/rapid-response-samsung-magicinfo9-server-flaw
Bring Your Own Installer: Bypassing SentinelOne Through Agent Version Change Interruption
SentinelOne s installer is vulnerable to an exploit allowing attackers to shut down the end point protection software
https://www.aon.com/en/insights/cyber-labs/bring-your-own-installer-bypassing-sentinelone
Commvault Still Exploitable
A recent patch for Commvault is apparently ineffective and the PoC exploit published by watchTowr is still working against up to date patched systems
https://infosec.exchange/@wdormann/114458913006792356

Example of Modular Malware
Xavier analyzes modular malware that downloads DLLs from GitHub if specific features are required. In particular, the webcam module is inspected in detail.
https://isc.sans.edu/diary/Example%20of%20%22Modular%22%20Malware/31928
Sysaid XXE Vulnerabilities
IT Service Management Software Sysaid patched a number of XXE vulnerabilities. Without authentication, an attacker is able to obtain confidential data and completely compromise the system. watchTowr published a detailed analysis of the flaws including exploit code.
https://labs.watchtowr.com/sysowned-your-friendly-rce-support-ticket/
Cisco IOS XE Wireless Controller Software Arbitrary File Upload Vulnerability
Cisco Patched a vulnerability in its wireless controller software that may be used to not only upload files but also execute code as root without authentication.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-file-uplpd-rHZG9UfC
Unifi Protect Camera Vulnerability
Ubiquity patched a vulnerability in its Protect camera firmware fixing a buffer overflow flaw.
https://community.ui.com/releases/Security-Advisory-Bulletin-047-047/cef86c37-7421-44fd-b251-84e76475a5bc

Python InfoStealer with Embedded Phishing Webserver
Didier found an interesting infostealer that, in addition to implementing typical infostealer functionality, includes a web server suitable to create local phishing sites.
https://isc.sans.edu/diary/Python%20InfoStealer%20with%20Embedded%20Phishing%20Webserver/31924
Android Update Fixes Freetype 0-Day
Google released its monthly Android update. As part of the update, it patched a vulnerability in Freetype that is already being exploited. Android is not alone in using Freetype. Freetype is a very commonly used library to parse fonts like Truetype fonts.
https://source.android.com/docs/security/bulletin/2025-05-01
CISA Warns of Unsophistacted Cyber Actors
CISA released an interesting title report warning operators of operational technology networks of ubiquitous attacks by unsophisticated actors. It emphasizes how important it is to not forget basic security measures to defend against these attacks.
https://www.cisa.gov/news-events/alerts/2025/05/06/unsophisticated-cyber-actors-targeting-operational-technology

Mirai Now Exploits Samsung MagicINFO CMS CVE-2024-7399
The Mirai botnet added a new vulnerability to its arsenal. This vulnerability, a file upload and remote code execution vulnerability in Samsung s MagicInfo 9 CMS, was patched last August but attracted new attention last week after being mostly ignored so far.
https://isc.sans.edu/diary/Mirai+Now+Exploits+Samsung+MagicINFO+CMS+CVE20247399/31920
New Kali Linux Signing Key
The Kali Linux maintainers lost access to the secret key used to sign packages. Users must install a new key that will be used going forward.
https://www.kali.org/blog/new-kali-archive-signing-key/
The Risk of Default Configuration: How Out-of-the-Box Helm Charts Can Breach Your Cluster
Many out-of-the-box Helm charts for Kubernetes applications deploy vulnerable configurations with exposed ports and no authentication
https://techcommunity.microsoft.com/blog/microsoftdefendercloudblog/the-risk-of-default-configuration-how-out-of-the-box-helm-charts-can-breach-your/4409560

Steganography Challenge
Didier published a fun steganography challenge. A solution will be offered on Saturday.
https://isc.sans.edu/diary/Steganography+Challenge/31910
Microsoft Makes Passkeys Default Authentication Method
Microsoft is now encouraging new users to use Passkeys as the default and only login method, further moving away from passwords
https://www.microsoft.com/en-us/security/blog/2025/05/01/pushing-passkeys-forward-microsofts-latest-updates-for-simpler-safer-sign-ins/
Microsoft Authenticator Autofill Changes
Microsoft will no longer support the use of Microsoft authenticator as a password safe. Instead, it will move users to the password prefill feature built into Microsoft Edge. This change will start in June and should be completed in August at which point you must have moved your credentials out of Microsoft Authenticator
https://support.microsoft.com/en-gb/account-billing/changes-to-microsoft-authenticator-autofill-09fd75df-dc04-4477-9619-811510805ab6
Backdoor found in popular e-commerce components
SANSEC identified several backdoored Magento e-commerce components. These backdoors were installed as far back as 2019 but only recently activated, at which point they became known. Affected vendors dispute any compromise at this point.
https://sansec.io/research/license-backdoor