#VU47651 OS Command Injection in Sympa - CVE-2020-26880

Vulnerability identifier: #VU47651

Vulnerability risk: Low

CVSSv4.0: 7.4 [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

Exploit availability: No

Vulnerable software:
Sympa
Server applications / Mail servers

Vendor: sympa.org

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Sympa: 0.001 - 6.2.56

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External links
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

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.