Improper access control in Postorius - CVE-2021-40347
Published: September 12, 2021
Vulnerability identifier: #VU56454
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-40347
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions in views/list.py. A remote user logged in into any account can send a specially crafted HTTP POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.
Affected software
Postorius
postorius (Debian package)
postorius (Debian package)
How to mitigate CVE-2021-40347
Install updates from vendor's website.
Postorius - update to 1.3.5
postorius (Debian package) - addressed in versions 1.2.4-1+deb10u1, 1.3.4-2+deb11u1
postorius (Debian package) - addressed in versions 1.2.4-1+deb10u1, 1.3.4-2+deb11u1
External References
- https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b
- https://gitlab.com/mailman/postorius/-/tags
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746
- https://gitlab.com/mailman/postorius/-/issues/531
- https://phabricator.wikimedia.org/T289798
- https://www.debian.org/security/2021/dsa-4970