CVE-2021-32803

Name
CVE-2021-32803
Description
The npm package "tar" (aka node-tar) before versions 6.1.2, 5.0.7, 4.4.15, and 3.2.3 has an arbitrary File Creation/Overwrite vulnerability via insufficient symlink protection. `node-tar` aims to guarantee that any file whose location would be modified by a symbolic link is not extracted. This is, in part, achieved by ensuring that extracted directories are not symlinks. Additionally, in order to prevent unnecessary `stat` calls to determine whether a given path is a directory, paths are cached when directories are created. This logic was insufficient when extracting tar files that contained both a directory and a symlink with the same name as the directory. This order of operations resulted in the directory being created and added to the `node-tar` directory cache. When a directory is present in the directory cache, subsequent calls to mkdir for that directory are skipped. However, this is also where `node-tar` checks for symlinks occur. By first creating a directory, and then replacing that directory with a symlink, it was thus possible to bypass `node-tar` symlink checks on directories, essentially allowing an untrusted tar file to symlink into an arbitrary location and subsequently extracting arbitrary files into that location, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.3, 4.4.15, 5.0.7 and 6.1.2.
NVD Severity
high
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
MISC https://www.npmjs.com/advisories/1771
CONFIRM https://github.com/npm/node-tar/security/advisories/GHSA-r628-mhmh-qjhw
MISC https://github.com/npm/node-tar/commit/9dbdeb6df8e9dbd96fa9e84341b9d74734be6c20
MISC https://www.npmjs.com/package/tar
MISC https://www.oracle.com/security-alerts/cpuoct2021.html

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:tar_project:tar:*:*:*:*:*:node.js:*:* tar >= None < 3.2.3
cpe:2.3:a:tar_project:tar:*:*:*:*:*:node.js:*:* tar >= 4.0.0 < 4.4.15
cpe:2.3:a:tar_project:tar:*:*:*:*:*:node.js:*:* tar >= 5.0.0 < 5.0.7
cpe:2.3:a:tar_project:tar:*:*:*:*:*:node.js:*:* tar >= 6.0.0 < 6.1.2

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
tar edge-main 1.34-r0 Carlo Landmeter <clandmeter@alpinelinux.org> possibly vulnerable
tar 3.14-main 1.34-r0 Carlo Landmeter <clandmeter@alpinelinux.org> possibly vulnerable
tar 3.13-main 1.34-r0 Carlo Landmeter <clandmeter@alpinelinux.org> possibly vulnerable
tar 3.12-main 1.32-r2 Carlo Landmeter <clandmeter@gmail.com> possibly vulnerable
tar 3.11-main 1.32-r2 Carlo Landmeter <clandmeter@gmail.com> possibly vulnerable