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CVE-2019-17455

Description

Libntlm through 1.5 relies on a fixed buffer size for tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and tSmbNtlmAuthResponse read and write operations, as demonstrated by a stack-based buffer over-read in buildSmbNtlmAuthRequest in smbutil.c for a crafted NTLM request.

POC

Reference

- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=942145

- https://gitlab.com/jas/libntlm/issues/2

Github

- https://github.com/jas4711/libntlm