[Security Issue]
IBM i Access Client Solutions (ACS) is vulnerable to remote credential theft when NT LAN Manager (NTLM) is enabled on Windows workstations.
Attackers can create UNC capable paths within ACS 5250 display terminal configuration ".HOD" or ".WS" files to point to a hostile server.
If NTLM is enabled and the user opens an attacker supplied file the Windows operating system will try to authenticate using the current user's session.
The attacker controlled server could then capture the NTLM hash information to obtain the user's credentials.
[Disclosure Timeline]
Vendor Notification: December 14, 2023
Vendor Addresses Issue: February 7, 2024
February 8, 2024 : Public Disclosure
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Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit
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or exploits by the author or elsewhere. All content (c).
hyp3rlinx
Ibm i access client solutions v1.1.2 1.1.4, v1.1.4.3 1.1.9.4 remote credential theft