OS Command Injection in Sympa - CVE-2020-26880

Vulnerability identifier: #VU47651

CSH Severity: Low

CVSS v4: 9.3 [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]

CVE-ID: CVE-2020-26880

CWE-ID: CWE-78

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Sympa
sympa (Debian package)
sympa
Fedora

Install updates from vendor's website.

Sympa - update to 6.2.57
sympa (Debian package) - update to 6.2.40~dfsg-1+deb10u1
sympa - addressed in versions 6.2.62-1.el7, 6.2.62-1.fc32, 6.2.62-1.fc33, 6.2.62-1.fc34

• 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

• Privilege escalation in Sympa
• Debian update for sympa
• Fedora EPEL 7 update for sympa
• Fedora 34 update for sympa
• Fedora 33 update for sympa
• Fedora 32 update for sympa