Microsoft Patch Tuesday
Microsoft today released patches for 67 vulnerabilities. 10 of these vulnerabilities are rated critical. One vulnerability has already been exploited and another vulnerability has been publicly disclosed before today.
https://isc.sans.edu/diary/Microsoft%20Patch%20Tuesday%20June%202025/32032
Adobe Vulnerabilities
Adobe released patches for 7 different applications. Two significant ones are Adobe Commerce and Adobe Acrobat Reader. All vulnerabilities patched for Adobe Commerce can only be exploited by an authenticated user. The Adobe Acrobat Reader vulnerabilities are exploited by a user opening a crafted PDF, and the exploit may execute arbitrary code.
https://helpx.adobe.com/security/Home.html

OctoSQL & Vulnerability Data
OctoSQL is a neat tool to query files in different formats using SQL. This can, for example, be used to query the JSON vulnerability files from CISA or NVD and create interesting joins between different files.
https://isc.sans.edu/diary/OctoSQL+Vulnerability+Data/32026
Mirai vs. Wazuh
The Mirai botnet has now been observed exploiting a vulnerability in the open-source EDR tool Wazuh.
https://www.akamai.com/blog/security-research/botnets-flaw-mirai-spreads-through-wazuh-vulnerability
DNS4EU
The European Union created its own public recursive resolver to offer a public resolver compliant with European privacy laws. This resolver is currently operated by ENISA, but the intent is to have a commercial entity operate and support it by a commercial entity.
https://www.joindns4.eu/
WordPress FAIR Package Manager
Recent legal issues around different WordPress-related entities have made it more difficult to maintain diverse sources of WordPress plugins. With WordPress plugins usually being responsible for many of the security issues, the Linux Foundation has come forward to support the FAIR Package Manager, a tool intended to simplify the management of WordPress packages.
https://github.com/fairpm

Extracting With pngdump.py
Didier extended his pngdump.py script to make it easier to extract additional data appended to the end of the image file.
https://isc.sans.edu/diary/Extracting%20With%20pngdump.py/32022
16 React Native Packages for GlueStack Backdoored Overnight
16 npm packages with over a million weekly downloads between them were compromised. The compromised packages include a remote admin tool that was seen before in similar attacks.
https://www.aikido.dev/blog/supply-chain-attack-on-react-native-aria-ecosystem
Atomic MacOS Stealer Exploits Clickfix
MacOS users are now also targeted by fake captchas, tricking users into running exploit code.
https://www.cloudsek.com/blog/amos-variant-distributed-via-clickfix-in-spectrum-themed-dynamic-delivery-campaign-by-russian-speaking-hackers
Microsoft INETPUB Script
Microsoft published a simple PowerShell script to restore the inetpub folder in case you removed it by mistake.
https://www.powershellgallery.com/packages/Set-InetpubFolderAcl/1.0

Be Careful With Fake Zoom Client Downloads
Miscreants are tricking victims into downloading fake Zoom clients (and likely other meeting software) by first sending them fake meeting invites that direct victims to a page that offers malware for download as an update to the Zoom client.
https://isc.sans.edu/diary/Be%20Careful%20With%20Fake%20Zoom%20Client%20Downloads/32014
Python tarfile Vulnerability
Recently, the Python tarfile module introduced a filter option to help mitigate some of the insecure behavior common to software unpacking archives. This filter is, however, not working quite as well as it should.
https://mail.python.org/archives/list/[email protected]/thread/MAXIJJCUUMCL7ATZNDVEGGHUMQMUUKLG/
Hewlett Packard Enterprise Insight Remote Support processAttachmentDataStream Directory Traversal Remote Code Execution Vulnerability
HP fixed, among other vulnerabilities, a critical remote code execution vulnerability in Insight Remote Support (IRS)
https://www.zerodayinitiative.com/advisories/ZDI-25-325/

Phishing e-mail that hides malicious links from Outlook users
Jan found a phishing email that hides the malicious link from Outlook users. The email uses specific HTML comment clauses Outlook interprets to render or not render specific parts of the email s HTML code. Jan suggests that the phishing email is intented to not expose users of
https://isc.sans.edu/diary/Phishing%20e-mail%20that%20hides%20malicious%20link%20from%20Outlook%20users/32010
Amazon changing default logging from blocking to non-blocking
Amazon will change the default logging mode from blocking to non-blocking. Non-blocking logging will not stop the application if logging fails, but may result in a loss of logs.
https://aws.amazon.com/blogs/containers/preventing-log-loss-with-non-blocking-mode-in-the-awslogs-container-log-driver/
Cisco Removes Backdoor
Cisco fixed a Cisco Identity Services Engine on Cloud Platforms Static Credential Vulnerability.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-aws-static-cred-FPMjUcm7
Infoblox Vulnerability Details disclosed
Details regarding several vulnerabilities recently patched in Infoblox s NetMRI have been made public. In particular an unauthenticated remote code execution issue should be considered critical.
https://rhinosecuritylabs.com/research/infoblox-multiple-cves/

vBulletin Exploits CVE-2025-48827, CVE-2025-48828
We do see exploit attempts for the vBulletin flaw disclosed about a week ago. The flaw is only exploitable if vBulltin is run on PHP 8.1, and was patched over a year ago. However, vBulltin never disclosed the type of vulnerability that was patched.
https://isc.sans.edu/diary/vBulletin%20Exploits%20%28CVE-2025-48827%2C%20CVE-2025-48828%29/32006
Google Chrome 0-Day Patched
Google released a security update for Google Chrome patching three flaws. One of these is already being exploited.
https://chromereleases.googleblog.com/
Roundcube Update
Roundcube patched a vulnerability that allows any authenticated user to execute arbitrary code.
https://roundcube.net/news/2025/06/01/security-updates-1.6.11-and-1.5.10
HP Vulnerabilities in StoreOnce
HP patched multiple vulnerabilities in StoreOnce. These issues could lead to remote code execution
https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbst04847en_us&docLocale=en_US

Simple SSH Backdoor
Xavier came across a simple SSH backdoor taking advantage of the ssh client preinstalled on recent Windows systems. The backdoor is implemented via an SSH configuration file that instructs the SSH client to connect to a remote system and forward a shell on a random port. This will make the shell accessible to anybody able to connect to the C2 host.
https://isc.sans.edu/diary/Simple%20SSH%20Backdoor/32000
Google Chrome to Distrust CAs
Google Chrome will remove the Chunghwa Telecom and Netlock certificate authorities from its list of trusted CAs. Any certificates issued after July 31st will not be trusted. Certificates issued before the deadline will be trusted until they expire.
https://security.googleblog.com/2025/05/sustaining-digital-certificate-security-chrome-root-store-changes.html
Microsoft Emergency Update to Fix Crashes Caused by May Patch
Microsoft released an emergency update for a bug caused by one of the patches released in May. Due to the bug, systems may not restart after the patch is applied. This affects, first of all, virtual systems running in Azure and HyperV but apparently has also affected some physical systems.
https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-23h2#kb5058405-might-fail-to-install-with-recovery-error-0xc0000098-in-acpi-sys
Qualcomm Adreno Graphics Processing Unit Patch (Exploited!)
Qualcomm released an update for the driver for its Adreno GPU. The patched vulnerability is already being exploited against Android devices.
https://docs.qualcomm.com/product/publicresources/securitybulletin/june-2025-bulletin.html

A PNG Image With an Embedded Gift
Xavier shows how Python code attached to a PNG image can be used to implement a command and control channel or a complete remote admin kit.
https://isc.sans.edu/diary/A+PNG+Image+With+an+Embedded+Gift/31998
Cisco IOS XE WLC Arbitrary File Upload Vulnerability (CVE-2025-20188) Analysis
Horizon3 analyzed a recently patched flaw in Cisco Wireless Controllers. This arbitrary file upload flaw can easily be used to execute arbitrary code.
https://horizon3.ai/attack-research/attack-blogs/cisco-ios-xe-wlc-arbitrary-file-upload-vulnerability-cve-2025-20188-analysis/
Don't Call That "Protected" Method: Dissecting an N-Day vBulletin RCE
A change in PHP 8.1 can expose methods previously expected to be safe . vBulletin fixed a related flaw about a year ago without explicitly highlighting the security impact of the fix. A blog post now exposed the flaw and provided exploit examples. We have seen exploit attempts against honeypots starting May 25th, two days after the blog was published.
https://karmainsecurity.com/dont-call-that-protected-method-vbulletin-rce

Alternate Data Streams: Adversary Defense Evasion and Detection
Good Primer of alternate data streams and how they are abused, as well as how to detect and defend against ADS abuse.
https://isc.sans.edu/diary/Alternate%20Data%20Streams%20%3F%20Adversary%20Defense%20Evasion%20and%20Detection%20%5BGuest%20Diary%5D/31990
Connectwise Breach Affects ScreenConnect Customers
Connectwise s ScreenConnect solution was compromised, leading to attacks against a small number of customers. This is yet another example of how attackers are taking advantage of remote access solutions.
https://www.connectwise.com/company/trust/advisories
Mark Your Calendar: APT41 Innovative Tactics
Google detected attacks leveraging Google s calendar solution as a command and control channel.
https://cloud.google.com/blog/topics/threat-intelligence/apt41-innovative-tactics
Webs of Deception: Using the SANS ICS Kill Chain to Flip the Advantage to the Defender
Defending a small Industrial Control System (ICS) against sophisticated threats can seem futile. The resource disparity between small ICS defenders and sophisticated attackers poses a significant security challenge.
https://www.sans.edu/cyber-research/webs-deception-using-sans-ics-kill-chain-flip-advantage-defender/

Exploring a Use Case of Artificial Intelligence Assistance with Understanding an Attack
Jennifer Wilson took a weird string found in a recent honeypot sample and worked with ChatGPT to figure out what it is all about.
https://isc.sans.edu/diary/%5BGuest%20Diary%5D%20Exploring%20a%20Use%20Case%20of%20Artificial%20Intelligence%20Assistance%20with%20Understanding%20an%20Attack/31980
Ransomware Deployed via SimpleHelp Vulnerabilities
Ransomware actors are using vulnerabilities in SimpleHelp to gain access to victim s networks via MSPs. The exploited vulnerabilities were patched in January.
https://news.sophos.com/en-us/2025/05/27/dragonforce-actors-target-simplehelp-vulnerabilities-to-attack-msp-customers/
OS Command Injection in Everetz Equipment
Broadcast equipment manufactured by Everetz is susceptible to an OS command injection vulnerability. Everetz has not responded to researchers reporting the vulnerability so far and there is no patch available.
https://www.onekey.com/resource/security-advisory-remote-code-execution-on-evertz-svdn-cve-2025-4009