SB2019042209 - Symlink attack in Mercurial
Published: April 22, 2019 Updated: June 25, 2020
Security Bulletin ID
SB2019042209
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) Symlink attack (CVE-ID: CVE-2019-3902)
CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following
CVSSv4: 2.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to escalate privileges on the system.
The vulnerability exists due to a symlink following issue. A remote user can create a specially crafted symbolic link to and write files outside a repository.
Remediation
Install update from vendor's website.