CVE-2021-32803

high
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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.

References

https://www.npmjs.com/advisories/1771

https://github.com/npm/node-tar/security/advisories/GHSA-r628-mhmh-qjhw

https://github.com/npm/node-tar/commit/9dbdeb6df8e9dbd96fa9e84341b9d74734be6c20

https://www.npmjs.com/package/tar

https://www.oracle.com/security-alerts/cpuoct2021.html

Details

Source: MITRE

Published: 2021-08-03

Updated: 2021-12-10

Type: CWE-22

Risk Information

CVSS v2

Base Score: 5.8

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:P

Impact Score: 4.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 8.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Impact Score: 5.2

Exploitability Score: 2.8

Severity: HIGH

Tenable Plugins

View all (11 total)

IDNameProductFamilySeverity
153819FreeBSD : Node.js -- August 2021 Security Releases (2) (7062bce0-1b17-11ec-9d9d-0022489ad614)NessusFreeBSD Local Security Checks
high
153765Oracle Linux 8 : nodejs:14 (ELSA-2021-3666)NessusOracle Linux Local Security Checks
critical
153764RHEL 8 : nodejs:14 (RHSA-2021:3666)NessusRed Hat Local Security Checks
critical
153763CentOS 8 : nodejs:14 (CESA-2021:3666)NessusCentOS Local Security Checks
critical
153566Oracle Linux 8 : nodejs:12 (ELSA-2021-3623)NessusOracle Linux Local Security Checks
critical
153553RHEL 8 : nodejs:12 (RHSA-2021:3639)NessusRed Hat Local Security Checks
critical
153552RHEL 8 : nodejs:12 (RHSA-2021:3638)NessusRed Hat Local Security Checks
critical
153532CentOS 8 : nodejs:12 (CESA-2021:3623)NessusCentOS Local Security Checks
critical
153524RHEL 8 : nodejs:12 (RHSA-2021:3623)NessusRed Hat Local Security Checks
critical
152863RHEL 7 : rh-nodejs14-nodejs and rh-nodejs14-nodejs-nodemon (RHSA-2021:3280)NessusRed Hat Local Security Checks
critical
152862RHEL 7 : rh-nodejs12-nodejs and rh-nodejs12-nodejs-nodemon (RHSA-2021:3281)NessusRed Hat Local Security Checks
critical