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, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-4751-1
NVD severitylow
Debian Bugs968934

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
squid (PTS)buster, buster (security)4.6-1+deb10u4fixed
bullseye, sid4.13-1fixed
squid3 (PTS)stretch3.5.23-5+deb9u1vulnerable
stretch (security)3.5.23-5+deb9u4vulnerable

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
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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