Attacks against Teltonika Networks SMS Gateways
Attackers are actively scanning for SMS Gateways. These attacks take advantage of default passwords and other commonly used passwords.
https://isc.sans.edu/diary/Attacks%20against%20Teltonika%20Networks%20SMS%20Gateways/31888
Commvault Vulnerability CVE-2205-34028
Commvault, about a week ago, published an advisory and a fix for a vulnerability in its backup software. watchTowr now released a detailed writeup and exploit for the vulnerability
https://labs.watchtowr.com/fire-in-the-hole-were-breaching-the-vault-commvault-remote-code-execution-cve-2025-34028/
Exploitation Trends Q1 2025
Vulncheck published a summary of exploitation trends, pointing out that about a quarter of vulnerabilities are exploited a day after a patch is made available.
https://vulncheck.com/blog/exploitation-trends-q1-2025
inetpub directory issues
The inetpub directory introduced by Microsoft in its April patch may lead to a denial of service against applying patches on Windows if an attacker can create a junction for that location pointing to an existing system binary like Notepad.
https://doublepulsar.com/microsofts-patch-for-cve-2025-21204-symlink-vulnerability-introduces-another-symlink-vulnerability-9ea085537741

Honeypot Iptables Maintenance and DShield-SIEM Logging
In this diary, Jesse is talking about some of the tasks to maintain a honeypot, like keeping filebeats up to date and adjusting configurations in case your dynamic IP address changes
https://isc.sans.edu/diary/Honeypot%20Iptables%20Maintenance%20and%20DShield-SIEM%20Logging/31876
XRPL.js Compromised
An unknown actor was able to push malicious updates of the XRPL.js library to NPM. The library is officially recommended for writing Riple (RPL) cryptocurrency code. The malicious library exfiltrated secret keys to the attacker
https://www.aikido.dev/blog/xrp-supplychain-attack-official-npm-package-infected-with-crypto-stealing-backdoor
https://github.com/XRPLF/xrpl.js/security/advisories/GHSA-33qr-m49q-rxfx
Cisco Equipment Affected by Erlang/OTP SSH Vulnerability
Cisco published an advisory explaining which of its products are affected by the critical Erlang/OTP SSH library vulnerability
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-erlang-otp-ssh-xyZZy

xorsearch.py: Ad Hoc YARA Rules
Adhoc YARA rules allow for easy searches using command line arguments without having to write complete YARA rules for simple use cases like string and regex searches
https://isc.sans.edu/diary/xorsearch.py%3A%20%22Ad%20Hoc%20YARA%20Rules%22/31856
Google Spoofed via DKIM Replay Attack
DKIM replay attacks are a known issue where the attacker re-uses a prior DKIM signature. This will work as long as the headers signed by the signature are unchanged. Recently, this attack has been successful against Google.
https://easydmarc.com/blog/google-spoofed-via-dkim-replay-attack-a-technical-breakdown/
SSL.com E-Mail Validation Bug
SSL.com did not properly verify which domain a particular email address is authorized to receive certificates for. This could have been exploited against webmail providers.
https://bugzilla.mozilla.org/show_bug.cgi?id=1961406

It's 2025, so why are malicious advertising URLs still going strong?
Phishing attacks continue to take advantage of Google s advertising services. Sadly, this is still the case for obviously malicious links, even after various anti-phishing services flag the URL.
https://isc.sans.edu/diary/It%27s%202025...%20so%20why%20are%20obviously%20malicious%20advertising%20URLs%20still%20going%20strong%3F/31880
ChatGPT Fingerprinting Documents via Unicode
ChatGPT apparently started leaving fingerprints in texts, which it creates by adding invisible Unicode characters like non-breaking spaces.
https://www.rumidocs.com/newsroom/new-chatgpt-models-seem-to-leave-watermarks-on-text
Asus AI Cloud Security Advisory
Asus warns of a remote code execution vulnerability in its routers. The vulnerability is related to the AI Cloud feature. If your router is EoL, disabling the feature will mitigate the vulnerability
https://www.asus.com/content/asus-product-security-advisory/
PyTorch Vulnerability
PyTorch fixed a remote code execution vulnerability exploitable if a malicious model was loaded. This issue was exploitable even with the weight_only=True" setting selected
https://github.com/pytorch/pytorch/security/advisories/GHSA-53q9-r3pm-6pq6

Microsoft Entra User Lockout
Multiple organizations reported widespread alerts and account lockouts this weekend from Microsoft Entra. The issue is caused by a new feature Microsoft enabled. This feature will lock accounts if Microsoft believes that the password for the account was compromised.
https://www.bleepingcomputer.com/news/microsoft/widespread-microsoft-entra-lockouts-tied-to-new-security-feature-rollout/
https://learn.microsoft.com/en-us/entra/identity/authentication/feature-availability
Erlang/OTP SSH Exploit
An exploit was published for the Erlang/OTP SSH vulnerability. The vulnerability is easy to exploit, and the exploit and a Metasploit module allow for easy remote code execution.
https://github.com/exa-offsec/ssh_erlangotp_rce/blob/main/ssh_erlangotp_rce.rb
Sonicwall Exploited
An older command injection vulnerability is now exploited on Sonicwall devices after initially gaining access by brute-forcing credentials.
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022
Unpatched Vulnerability in Bubble.io
An unpatched vulnerability in the no-code platform bubble.io can be used to access any project hosted on the site.
https://github.com/demon-i386/pop_n_bubble

RedTail: Remnux and Malware Management
A description showing how to set up a malware analysis in the cloud with Remnux and Kasm. RedTail is a sample to illustrate how the environment can be used.
https://isc.sans.edu/diary/RedTail%2C%20Remnux%20and%20Malware%20Management%20%5BGuest%20Diary%5D/31868
Critical Erlang/OTP SSH Vulnerability
Researchers identified a critical vulnerability in the Erlang/OTP SSH library. Due to this vulnerability, SSH servers written in Erlang/OTP allow arbitrary remote code execution without prior authentication
https://www.openwall.com/lists/oss-security/2025/04/16/2
Brickstorm Analysis
An analysis of a recent instance of the Brickstorm backdoor. This backdoor used to be more known for infecting Linux systems, but now it also infects Windows.
https://www.nviso.eu/blog/nviso-analyzes-brickstorm-espionage-backdoor
https://blog.nviso.eu/wp-content/uploads/2025/04/NVISO-BRICKSTORM-Report.pdf
OpenAI GPT 4.1 Controversy
OpenAI released its latest model, GPT 4.1, without a safety report and guardrails to prevent malware creation.
https://opentools.ai/news/openai-stirs-controversy-with-gpt-41-release-lacking-safety-report

Apple Updates
Apple released updates for iOS, iPadOS, macOS, and VisionOS. The updates fix two vulnerabilities which had already been exploited against iOS.
https://isc.sans.edu/diary/Apple%20Patches%20Exploited%20Vulnerability/31866
Oracle Updates
Oracle released it quarterly critical patch update. The update addresses 378 security vulnerabilities. Many of the critical updates are already known vulnerabilities in open-source software like Apache and Nginx ingress.
https://www.oracle.com/security-alerts/cpuapr2025.html
Oracle Breach Guidance
CISA released guidance for users affected by the recent Oracle cloud breach. The guidance focuses on the likely loss of passwords.
https://www.cisa.gov/news-events/alerts/2025/04/16/cisa-releases-guidance-credential-risks-associated-potential-legacy-oracle-cloud-compromise
Google Chrome Update
A Google Chrome update released today fixes two security vulnerabilities. One of the vulnerabilities is rated as critical.
https://chromereleases.googleblog.com/2025/04/stable-channel-update-for-desktop_15.html
CVE Updates
CISA extended MITRE s funding to operate the CVE numbering scheme. However, a number of other organizations announced that they may start alternative vulnerability registers.
https://euvd.enisa.europa.eu/
https://gcve.eu/
https://www.thecvefoundation.org/

Online Services Again Abused to Exfiltrate Data
Attackers like to abuse free online services that can be used to exfiltrate data. From the originals , like pastebin,
to past favorites like anonfiles.com. The latest example is gofile.io. As a defender, it is important to track these services to detect exfiltration early
https://isc.sans.edu/diary/Online%20Services%20Again%20Abused%20to%20Exfiltrate%20Data/31862
OpenSSH 10.0 Released
OpenSSH 10.0 was released. This release adds quantum-safe ciphers and the separation of authentication services into a separate binary to reduce the authentication attack surface.
https://www.openssh.com/releasenotes.html#10.0p1
Apache Roller Vulnerability
Apache Roller addressed a vulnerability. Its CVSS score of 10.0 appears inflated, but it is still a vulnerability you probably want to address.
https://lists.apache.org/thread/4j906k16v21kdx8hk87gl7663sw7lg7f
CVE Funding Changes
Mitre s government contract to operate the CVE system may run out tomorrow. This could lead to a temporary disruption of services, but the system is backed by a diverse board of directors representing many large companies. It is possible that non-government funding sources may keep the system afloat for now.
https://www.cve.org/

xorsearch Update
Diedier updated his "xorsearch" tool. It is now a python script, not a compiled binary, and supports Yara signatures. With Yara support also comes support for regular expressions.
https://isc.sans.edu/diary/xorsearch.py%3A%20Searching%20With%20Regexes/31854
Shorter Lived Certificates
The CA/Brower Forum passed an update to reduce the maximum livetime of
certificates. The reduction will be implemented over the next four years. EFF also released an update to certbot introducing profiles that can be used to request shorter lived certificates.
https://www.eff.org/deeplinks/2025/04/certbot-40-long-live-short-lived-certs
https://groups.google.com/a/groups.cabforum.org/g/servercert-wg/c/bvWh5RN6tYI
New Malware Harvesting Data from USB drives and infecting them.
Kaspersky is reporting that they identified new malware that not only harvests data from USB drives, but also spread via USB drives by replacing existing documents with malicious files.
https://securelist.com/goffee-apt-new-attacks/116139/

Exploit Attempts for Recent Langflow AI Vulnerability (CVE-2025-3248)
After spotting individaul attempts to exploit the recent Langflow vulnerability late last weeks, we now see more systematic internet wide scans attempting to verify the vulnerability.
https://isc.sans.edu/forums/diary/Exploit+Attempts+for+Recent+Langflow+AI+Vulnerability+CVE20253248/31850/
Fortinet Analysis of Threat Actor Activity
Fortinet oberved recent vulnerablities in its devices being used to add a symlink to ease future compromise. The symlink is not removed by prior patches, and Fortinet released additional updates to detect and remove this attack artifact.
https://www.fortinet.com/blog/psirt-blogs/analysis-of-threat-actor-activity
MSFT Inetpub
Microsoft clarrified that its April patches created the inetpub directory on purpose. Users should not remove it.
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21204#exploitability
SANSFIRE
https://isc.sans.edu/j/sansfire