OS Command Injection in Sympa - CVE-2020-26880

Vulnerability identifier: #VU47651

CSH Severity: Low

CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Clear

CVE-ID: CVE-2020-26880

CWE-ID: CWE-78

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerable software:
Sympa

Software vendor:
sympa.org

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to incorrect default permissions for the sympa.conf configuration file. A local user with access to modify the file (e.g. the sympa user account) can injection and execute arbitrary OS commands in the system with root privileges via the setuid sympa_newaliases-wrapper executable by parsing the modified sympa.conf file.

Install updates from vendor's website.

• https://github.com/sympa-community/sympa/issues/1009
• https://github.com/sympa-community/sympa/issues/943#issuecomment-704779420
• https://github.com/sympa-community/sympa/issues/943#issuecomment-704842235