CVE-2021-32804

NameCVE-2021-32804
DescriptionThe npm package "tar" (aka node-tar) before versions 6.1.1, 5.0.6, 4.4.14, and 3.3.2 has a arbitrary File Creation/Overwrite vulnerability due to insufficient absolute path sanitization. node-tar aims to prevent extraction of absolute file paths by turning absolute paths into relative paths when the `preservePaths` flag is not set to `true`. This is achieved by stripping the absolute path root from any absolute file paths contained in a tar file. For example `/home/user/.bashrc` would turn into `home/user/.bashrc`. This logic was insufficient when file paths contained repeated path roots such as `////home/user/.bashrc`. `node-tar` would only strip a single path root from such paths. When given an absolute file path with repeating path roots, the resulting path (e.g. `///home/user/.bashrc`) would still resolve to an absolute path, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.2, 4.4.14, 5.0.6 and 6.1.1. Users may work around this vulnerability without upgrading by creating a custom `onentry` method which sanitizes the `entry.path` or a `filter` method which removes entries with absolute paths. See referenced GitHub Advisory for details. Be aware of CVE-2021-32803 which fixes a similar bug in later versions of tar.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs992111

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
node-tar (PTS)stretch2.2.1-1fixed
buster4.4.6+ds1-3vulnerable
bullseye6.0.5+ds1+~cs11.3.9-1vulnerable
bookworm, sid6.1.11+~cs11.3.10-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
node-tarsourcestretch(not affected)
node-tarsource(unstable)6.1.7+~cs11.3.10-1992111

Notes

[bullseye] - node-tar <no-dsa> (Minor issue)
[buster] - node-tar <no-dsa> (Minor issue)
[stretch] - node-tar <not-affected> (Vulnerable code introduced later)
https://github.com/npm/node-tar/security/advisories/GHSA-3jfq-g458-7qm9
https://github.com/npm/node-tar/commit/1f036ca23f64a547bdd6c79c1a44bc62e8115da4

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