CVE-2020-15810

NameCVE-2020-15810
DescriptionAn issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Smuggling attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the proxy cache and any downstream caches with content from an arbitrary source. When configured for relaxed header parsing (the default), Squid relays headers containing whitespace characters to upstream servers. When this occurs as a prefix to a Content-Length header, the frame length specified will be ignored by Squid (allowing for a conflicting length to be used from another Content-Length header) but relayed upstream.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2394-1, DSA-4751-1
Debian Bugs968934

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
squid (PTS)bullseye (security), bullseye4.13-10+deb11u3fixed
bookworm, bookworm (security)5.7-2+deb12u2fixed
sid, trixie6.10-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
squidsourcebuster4.6-1+deb10u4DSA-4751-1
squidsource(unstable)4.13-1968934
squid3sourcestretch3.5.23-5+deb9u5DLA-2394-1
squid3source(unstable)(unfixed)

Notes

https://github.com/squid-cache/squid/security/advisories/GHSA-3365-q9qx-f98m
Squid 4: http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_10.patch

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