Multiple vulnerabilities in GNU Mailman

Published: 2021-11-24 | Updated: 2021-12-06

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-42096 CVE-2021-42097
CWE-ID	CWE-338 CWE-352
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Mailman Web applications / Webmail solutions
Vendor	GNU

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

EUVDB-ID: #VU58348

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-42096

CWE-ID: CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Exploit availability: No

Description

The vulnerability allows a remote attacker to brute-force the administrative password.

The vulnerability exists due to a certain csrf_token value is derived from the admin password. A remote attacker can conduct a brute-force attack against that password and gain unauthorized access to the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mailman: 2.0 - 2.1b1

External links

http://mail.python.org/archives/list/mailman-announce@python.org/thread/IKCO6JU755AP5G5TKMBJL6IEZQTTNPDQ/
http://bugs.launchpad.net/mailman/+bug/1947639
http://www.openwall.com/lists/oss-security/2021/10/21/4

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Cross-site request forgery

EUVDB-ID: #VU58347

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-42097

CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin. A remote attacker can trick the victim to visit a specially crafted web page and take over the admin account, as the csrf_token value is not specific to a single user account.