CVE-2021-33193

NameCVE-2021-33193
DescriptionA crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3351-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
apache2 (PTS)bullseye2.4.62-1~deb11u1fixed
bullseye (security)2.4.62-1~deb11u2fixed
bookworm, bookworm (security)2.4.62-1~deb12u2fixed
sid, trixie2.4.62-3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
apache2sourcebuster2.4.38-3+deb10u9DLA-3351-1
apache2sourcebullseye2.4.48-3.1+deb11u1
apache2source(unstable)2.4.48-4

Notes

[stretch] - apache2 <postponed> (Revisit when a suitable backport is available for 2.4.25)
https://portswigger.net/research/http2
https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c (2.4.49)
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2021-33193
https://git.centos.org/rpms/httpd/blob/c496dea5e0b6e82a9f503e973fc5d5ea93a94180/f/SOURCES/httpd-2.4.37-CVE-2021-33193.patch (2.4.37)
http://launchpadlibrarian.net/559974735/apache2_2.4.29-1ubuntu4.16_2.4.29-1ubuntu4.17.diff.gz (2.4.29)

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