Stored XSS in GNU Mailman

1) Stored cross-site scripting

EUVDB-ID: #VU27366

Risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-12137

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to mailman uses the .obj extension for scrubbed application/octet-stream MIME parts. A remote attacker can send a specially crafted attachment to the list, trick the victim to open the email in the list archive and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mailman: 2.0.1 - 2.1.29

External links

http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS
http://www.openwall.com/lists/oss-security/2020/04/24/3
http://www.openwall.com/lists/oss-security/2020/02/24/2
http://www.openwall.com/lists/oss-security/2020/02/24/3

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.