Cross-site scripting in Mailman - CVE-2021-43331

Vulnerability identifier: #VU58349

CSH Severity: Low

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]

CVE-ID: CVE-2021-43331

CWE-ID: CWE-79

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to insufficient sanitization of user-supplied data in Cgi/options.py. A remote attacker can trick the victim to follow a specially crafted link 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.

Mailman
HPE Helion Openstack
SUSE OpenStack Cloud
SUSE OpenStack Cloud Crowbar
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
Ubuntu
openEuler
mailman
mailman-debuginfo
mailman-debugsource
mailman (Ubuntu package)

Install updates from vendor's website.

Mailman - update to 2.1.36
mailman - update to 2.1.17-3.26.1
mailman-debuginfo - update to 2.1.17-3.26.1
mailman-debugsource - update to 2.1.17-3.26.1
mailman (Ubuntu package) - addressed in versions 1:2.1.26-1ubuntu0.5, 1:2.1.29-1ubuntu3.1
mailman - addressed in versions 2.1.36-1, 2.1.36-2
mailman-debuginfo - addressed in versions 2.1.36-1, 2.1.36-2
mailman-debugsource - addressed in versions 2.1.36-1, 2.1.36-2

• https://bugs.launchpad.net/mailman/+bug/1949401
• https://mail.python.org/archives/list/mailman-announce@python.org/message/I2X7PSFXIEPLM3UMKZMGOEO3UFYETGRL/

• Multiple vulnerabilities in GNU Mailman
• Ubuntu update for mailman
• SUSE update for mailman
• openEuler update for mailman
• openEuler 20.03 LTS SP3 update for mailman