CVE-2023-0836

NameCVE-2023-0836
DescriptionAn information leak vulnerability was discovered in HAProxy 2.1, 2.2 before 2.2.27, 2.3, 2.4 before 2.4.21, 2.5 before 2.5.11, 2.6 before 2.6.8, 2.7 before 2.7.1. There are 5 bytes left uninitialized in the connection buffer when encoding the FCGI_BEGIN_REQUEST record. Sensitive data may be disclosed to configured FastCGI backends in an unexpected way.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-5388-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
haproxy (PTS)jessie, jessie (lts)1.5.8-3+deb8u4fixed
stretch (security)1.7.5-2+deb9u1fixed
stretch (lts), stretch1.7.5-2+deb9u2fixed
buster (security), buster, buster (lts)1.8.19-1+deb10u5fixed
bullseye (security), bullseye2.2.9-2+deb11u6fixed
bookworm (security), bookworm2.6.12-1+deb12u1fixed
sid, trixie2.9.12-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
haproxysourcejessie(not affected)
haproxysourcestretch(not affected)
haproxysourcebuster(not affected)
haproxysourcebullseye2.2.9-2+deb11u5DSA-5388-1
haproxysource(unstable)2.6.8-1

Notes

[buster] - haproxy <not-affected> (Vulnerable code introduced later)
https://git.haproxy.org/?p=haproxy.git;a=commit;h=2e6bf0a2722866ae0128a4392fa2375bd1f03ff8
https://git.haproxy.org/?p=haproxy-2.6.git;a=commit;h=f988992d16f45ef03d5bbb024a1042ed8123e4c5 (v2.6.8)
https://git.haproxy.org/?p=haproxy-2.2.git;a=commit;h=18575ba4e5057afdb80cc06135272889ae1fa2d1 (v2.2.27)
Introduced by: https://git.haproxy.org/?p=haproxy.git;a=commitdiff;h=63bbf284a131de362ad5b60d64ff3b1eff830553 (v2.1-dev2)
[stretch] - haproxy <not-affected> (Vulnerable code introduced later)
[jessie] - haproxy <not-affected> (Vulnerable code introduced later)

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