[German]In recent months, a number of vulnerabilities and attack mechanisms have become known that could be used to siphon off credentials (NTLM/Kerberos). Not all vulnerabilities are easily exploitable, not everything has been fully patched by Microsoft. ACROS Security has now decided to close all known and exploitable Windows NTLM/Kerberos vulnerabilities by means of micropatches. ACROS Security has also completed the DFSCoerce forced authentication issue micropatch.
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ACROS Security, the security provider of founder Mitja Kolsek, has been mentioned here on the blog often with its micropatches. They provide free and paid micropatches via the 0patch agent, which are loaded into memory at the runtime of an application and then render the vulnerabilities harmless. Notes on how the 0patch agent works, which loads the micropatches into memory at an application's runtime, can be found in blog posts (such as here).
I came across the above tweet from Mitja Kolsek where he comments on the issue. Due to numerous customer requests, ACROS Security has decided to fix all known exploitable credential sharing (NTLM/Kerberos) issues in Windows. This even applies to cases where the attacker needs credentials with low privileges (which can be assumed in any larger network). Kolsek then provides an overview of the current status on Twitter.
For example, a bug in the print spooler that allows privilege escalation is closed with a micropatch. Other micropatches address the following vulnerabilities:
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- "PetitPotam" (CVE-2021-36942)
- RemotePotato0 (unfixed)
On July 1, 2022, they released a micropatch for the "DFSCoerce" 0day vulnerability (described on Twitter and Github). Microsoft's code correctly checks whether the user has access, but still initiates authentication with the attacker's server.
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