CVE-2024-29069

NameCVE-2024-29069
DescriptionIn snapd versions prior to 2.62, snapd failed to properly check the destination of symbolic links when extracting a snap. The snap format is a squashfs file-system image and so can contain symbolic links and other file types. Various file entries within the snap squashfs image (such as icons and desktop files etc) are directly read by snapd when it is extracted. An attacker who could convince a user to install a malicious snap which contained symbolic links at these paths could then cause snapd to write out the contents of the symbolic link destination into a world-readable directory. This in-turn could allow an unprivileged user to gain access to privileged information.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
snapd (PTS)stretch (security)2.21-2+deb9u1vulnerable
stretch (lts), stretch2.21-2+deb9u3vulnerable
buster (security), buster, buster (lts)2.37.4-1+deb10u3vulnerable
bullseye (security), bullseye2.49-1+deb11u2vulnerable
bookworm2.57.6-1vulnerable
trixie2.65.3-1fixed
sid2.66.1-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
snapdsourcestretch(unfixed)end-of-life
snapdsource(unstable)2.62-1

Notes

[bookworm] - snapd <no-dsa> (Minor issue)
[bullseye] - snapd <no-dsa> (Minor issue)
https://github.com/snapcore/snapd/pull/13682
[buster] - snapd <postponed> (Minor issue)

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