SB20260918294 - Multiple vulnerabilities in Gss-ntlmssp

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Main Vulnerability Database SB20260918294

SB20260918294 - Multiple vulnerabilities in Gss-ntlmssp

Published: September 18, 2026

Security Bulletin ID SB20260918294
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Out-of-bounds read (CVE-ID: N/A)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the NTLMv1 client-challenge extraction in gssntlm_srv_auth() when processing a Type-3 AUTHENTICATE message with an LM response shorter than eight bytes. A remote attacker can send a specially crafted authentication message to cause a denial of service.

The vulnerable path requires NTLMv1 with extended session security negotiated and an NT response of exactly 24 bytes.


2) NULL pointer dereference (CVE-ID: N/A)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a null pointer dereference in the NTLMv1 client-challenge extraction in gssntlm_srv_auth() when processing a Type-3 AUTHENTICATE message with a zero-length LM response. A remote attacker can send a specially crafted authentication message to cause a denial of service.

The vulnerable path requires NTLMv1 with extended session security negotiated and an NT response of exactly 24 bytes.


Remediation

Install update from vendor's website.

References