|Race 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.
|CVE (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.
|sid, trixie, bookworm
The information below is based on the following data on fixed versions.
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.