CVE-2018-20102

NameCVE-2018-20102
DescriptionAn out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might be able read the 16 bytes corresponding to an AAAA record from the non-initialized part of the buffer, possibly accessing anything that was left on the stack, or even past the end of the 8193-byte buffer, depending on the value of accepted_payload_size.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3034-1
Debian Bugs916308

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, trixie2.9.11-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
haproxysourcejessie(not affected)
haproxysourcestretch1.7.5-2+deb9u1DLA-3034-1
haproxysource(unstable)1.8.15-1916308

Notes

[jessie] - haproxy <not-affected> (Vulnerable code not present)
http://git.haproxy.org/?p=haproxy.git;a=commit;h=efbbdf72992cd20458259962346044cafd9331c0

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