SB2019043013 - Insecure link following in node-tar
Published: April 30, 2019 Updated: January 30, 2023
Security Bulletin ID
SB2019043013
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Link following (CVE-ID: CVE-2018-20834)
CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insecure following of hardlinks inside a tarball. A remote attacker can pass a specially crafted archive to the application and overwrite arbitrary files on the system.
Remediation
Install update from vendor's website.
References
- https://access.redhat.com/errata/RHSA-2019:1821
- https://github.com/npm/node-tar/commit/7ecef07da6a9e72cc0c4d0c9c6a8e85b6b52395d
- https://github.com/npm/node-tar/commit/b0c58433c22f5e7fe8b1c76373f27e3f81dcd4c8
- https://github.com/npm/node-tar/commits/v2.2.2
- https://github.com/npm/node-tar/compare/58a8d43...a5f7779
- https://hackerone.com/reports/344595