Category: SANS Full Feed

Walking my dog earlier, I came across the sign on the right. Having just looked at yet another middleware/HTTP header issue (the Next.js problem that became public this weekend) [1], I figured I should write something about HTTP headers. We all know HTTP headers. But it appears some do not know them well enough.  Let’s…

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Our API (https://isc.sans.edu/api) continues to be quite popular. One query we see a lot is lookups for individual IP addresses. Running many queries as you go through a log may cause you to get locked out by our rate limit. To help with that, we now offer additional “summary feeds” that include all data recently…

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In September, Cisco published an advisory noting two vulnerabilities [1]: CVE-2024-20439: Cisco Smart Licensing Utility Static Credential Vulnerability CVE-2024-20440: Cisco Smart Licensing Utility Information Disclosure Vulnerability These two vulnerabilities are somewhat connected. The first one is one of the many backdoors Cisco likes to equip its products with. A simple fixed password that can be…

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One of my hunting rules triggered some suspicious Python code, and, diving deeper, I found an interesting example of DLL side-loading. This technique involves placing a malicious DLL with the same name and export structure as a legitimate DLL in a location the application checks first, causing the application to load the malicious DLL instead of…

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I wanted to figure out how to statically decode the GUID encoded shellcode Xavier wrote about in his diary entry “Shellcode Encoded in UUIDs“. Here is the complete Python script: I use re-search.py to select the GUIDs: I then decode the hexadecimal data with my tool hex-to-bin.py. Option -H is needed to ignore all non-hexadecimal…

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