Vulnerability identifier: #VU27366

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mailman
Web applications / Webmail solutions

Vendor: GNU

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

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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

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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.