CVE-2021-32803

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.
Path Traversal
Link Following
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
8.2 HIGH
LOCAL
LOW
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
GitHub_MCNA
8.2 HIGH
LOCAL
LOW
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CVEADP
---
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Base Score
CVSS 3.x
EPSS Score
Percentile: 43%
VendorProductVersion
tar_projecttar
𝑥
< 3.2.3
tar_projecttar
4.0.0 ≤
𝑥
< 4.4.15
tar_projecttar
5.0.0 ≤
𝑥
< 5.0.7
tar_projecttar
6.0.0 ≤
𝑥
< 6.1.2
oraclegraalvm
20.3.3
oraclegraalvm
21.2.0
siemenssinec_infrastructure_network_services
𝑥
< 1.0.1.1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
node-tar
bullseye (security)
6.0.5+ds1+~cs11.3.9-1+deb11u2
fixed
bullseye
6.0.5+ds1+~cs11.3.9-1+deb11u2
fixed
stretch
not-affected
bookworm
6.1.13+~cs7.0.5-1
fixed
sid
6.2.1+~cs7.0.8-1
fixed
trixie
6.2.1+~cs7.0.8-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
node-tar
noble
not-affected
mantic
not-affected
lunar
not-affected
kinetic
not-affected
jammy
not-affected
impish
not-affected
hirsute
ignored
focal
Fixed 4.4.10+ds1-2ubuntu1+esm1
released
bionic
not-affected
xenial
not-affected
trusty
needs-triage