DescriptionLibarchive through 3.6.2 can cause directories to have world-writable permissions. The umask() call inside archive_write_disk_posix.c changes the umask of the whole process for a very short period of time; a race condition with another thread can lead to a permanent umask 0 setting. Such a race condition could lead to implicit directory creation with permissions 0777 (without the sticky bit), which means that any low-privileged local user can delete and rename files inside those directories.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1037093

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libarchive (PTS)buster3.3.3-4+deb10u1vulnerable
buster (security)3.3.3-4+deb10u3vulnerable
sid, trixie, bookworm3.6.2-1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[bookworm] - libarchive <no-dsa> (Minor issue)
[bullseye] - libarchive <no-dsa> (Minor issue)
[buster] - libarchive <no-dsa> (Minor issue)

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