Authentication bypass in Sympa

1) Improper Authentication

EUVDB-ID: #VU49168

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 - Improper Authentication

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:sympa_org:sympa:6.2.50:*:*:*:*:*:*:*
• cpe:2.3:a:sympa_org:sympa:6.2.52:*:*:*:*:*:*:*
• cpe:2.3:a:sympa_org:sympa:6.2.54:*:*:*:*:*:*:*

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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