CVE-2021-32804

Common vulnerabilities & exposures (CVE)

CVE database CVE database blogpost Release & EoL database

Published at: - 03-08-2021 09:15

Last modified: - 25-04-2022 09:12

Total changes: - 7

Description

The 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.

Common Vulnerability Scoring System (CVSS)

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

Low

Attack complexity

Network

Attack vector

High

Availability

None

Confidentiality

High

Integrity

None

Privileges required

Unchanged

Scope

Required

User interaction

8.1

Base score

2.8

5.2

Exploitability score

Impact score

Verification logic

vendor=tar_project AND product=tar AND target_software=node.js AND versionEndExcluding=3.2.2

vendor=tar_project AND product=tar AND target_software=node.js AND versionStartIncluding=4.0.0 AND versionEndExcluding=4.4.14

vendor=tar_project AND product=tar AND target_software=node.js AND versionStartIncluding=5.0.0 AND versionEndExcluding=5.0.6

vendor=tar_project AND product=tar AND target_software=node.js AND versionStartIncluding=6.0.0 AND versionEndExcluding=6.1.1

vendor=oracle AND product=graalvm AND version=20.3.3 AND software_edition=enterprise

vendor=oracle AND product=graalvm AND version=21.2.0 AND software_edition=enterprise

vendor=siemens AND product=sinec_infrastructure_network_services AND versionEndExcluding=1.0.1.1

Reference

Keywords

CVE-2021-32804

Common vulnerabilities & exposures (CVE)

Description

Common Vulnerability Scoring System (CVSS)

Verification logic

Reference

NVD

CVE-2021-32804

CVE

Common vulnerabilities & exposures

CVSS

Common vulnerability scoring system

Security

Vulnerabilities

Exposures