CVE-2023-4255

NameCVE-2023-4255
DescriptionAn out-of-bounds write issue has been discovered in the backspace handling of the checkType() function in etc.c within the W3M application. This vulnerability is triggered by supplying a specially crafted HTML file to the w3m binary. Exploitation of this flaw could lead to application crashes, resulting in a denial of service condition.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1059265

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
w3m (PTS)bullseye0.5.3+git20210102-6+deb11u1vulnerable
bookworm0.5.3+git20230121-2vulnerable
forky, sid, trixie0.5.3+git20230121-2.1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
w3msource(unstable)0.5.3+git20230121-2.11059265

Notes

[bookworm] - w3m <no-dsa> (Minor issue)
[bullseye] - w3m <no-dsa> (Minor issue)
[buster] - w3m <no-dsa> (Minor issue)
https://github.com/tats/w3m/commit/edc602651c506aeeb60544b55534dd1722a340d3
https://github.com/tats/w3m/issues/268
https://github.com/tats/w3m/pull/273
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