DescriptionRace condition in bzip2 1.0.2 and earlier allows local users to modify permissions of arbitrary files via a hard link attack on a file while it is being decompressed, whose permissions are changed by bzip2 after the decompression is complete.
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
bzip2 (PTS)buster1.0.6-9.2~deb10u1fixed
buster (security)1.0.6-9.2~deb10u2fixed
sid, trixie, bookworm1.0.8-5fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


This "vulnerability" is only exploitable under rarest circumstances: A (local)
attacker would have to exploit the minimal time span between uncompressing
the file and chmodding it to delete the file and place a hardlink to another
file of the "attacked" user. Additionally the attacker needs write permissions
to the directory where the file is being uncompressed, ruling out /~ etc.

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