#VU49168 Improper Authentication in Sympa - CVE-2020-29668

Vulnerability identifier: #VU49168

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-29668

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Sympa
Server applications / Mail servers

Vendor: sympa.org

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests. A remote attacker can bypass authentication process and obtain full SOAP API access by sending any arbitrary string (except one from an expired cookie) as the cookie value to authenticateAndRun.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Sympa: 6.2.50 - 6.2.59b.1

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External links
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=976020
https://github.com/sympa-community/sympa/blob/6.2.59b.2/NEWS.md
https://github.com/sympa-community/sympa/issues/1041
https://github.com/sympa-community/sympa/pull/1044
https://lists.debian.org/debian-lts-announce/2020/12/msg00026.html
https://www.debian.org/security/2020/dsa-4818

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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