CVE-2020-8517

NameCVE-2020-8517
DescriptionAn issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
squid (PTS)buster, buster (security)4.6-1+deb10u3vulnerable
bullseye, sid4.12-1fixed
squid3 (PTS)stretch3.5.23-5+deb9u1vulnerable
stretch (security)3.5.23-5+deb9u2vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
squidsource(unstable)4.10-1unimportant
squid3source(unstable)(unfixed)unimportant

Notes

http://www.squid-cache.org/Advisories/SQUID-2020_3.txt
Squid 3.5: http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-c62d2b43ad4962ea44aa0c5edb4cc99cb83a413d.patch
Squid 4: http://www.squid-cache.org/Versions/v4/changesets/squid-4-6982f1187a26557e582172965e266f544ea562a5.patch
Debian binary packages are not build with --enable-external-acl-helpers="[...]LM_group[...".

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