DescriptionGSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, memory corruption can be triggered when decoding UTF16 strings. The variable `outlen` was not initialized and could cause writing a zero to an arbitrary place in memory if `ntlm_str_convert()` were to fail, which would leave `outlen` uninitialized. This can lead to a denial of service if the write hits unmapped memory or randomly corrupts a byte in the application memory space. This vulnerability can trigger an out-of-bounds write, leading to memory corruption. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point. This issue is fixed in version 1.2.0.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1031369

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
gss-ntlmssp (PTS)buster, bullseye0.7.0-4fixed
sid, trixie, bookworm1.2.0-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
gss-ntlmsspsourcebuster(not affected)
gss-ntlmsspsourcebullseye(not affected)


[bullseye] - gss-ntlmssp <not-affected> (Vulnerable code not present)
[buster] - gss-ntlmssp <not-affected> (Vulnerable code not present) (v1.2.0)

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