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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200409-04] Squid: Denial of service when using NTLM authentication

Vulnerability Assessment Details

[GLSA-200409-04] Squid: Denial of service when using NTLM authentication

Vulnerability Assessment Summary
Squid: Denial of service when using NTLM authentication

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200409-04
(Squid: Denial of service when using NTLM authentication)

Squid 2.5.x versions contain a bug in the functions ntlm_fetch_string() and
ntlm_get_string() which lack checking the int32_t offset "o" for
negative values.

Impact

A remote attacker could cause a denial of service situation by sending
certain malformed NTLMSSP packets if NTLM authentication is enabled.

Workaround

Disable NTLM authentication by removing any "auth_param ntlm program
..." directives from squid.conf or use ntlm_auth from Samba-3.x.

References:
http://www1.uk.squid-cache.org/squid/Versions/v2/2.5/bugs/#squid-2.5.STABLE6-ntlm_fetch_string

Solution:
All Squid users should upgrade to the latest stable version:
# emerge sync
# emerge -pv ">=net-www/squid-2.5.6-r2"
# emerge ">=net-www/squid-2.5.6-r2"

Network Security Threat Level: Medium

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

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