Debian Security Advisory

DLA-2625-1 courier-authlib -- LTS security update

Date Reported:
14 Apr 2021
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 984810.
In Mitre's CVE dictionary: CVE-2021-28374.
More information:

The Debian courier-authlib package before 0.71.1-2 for Courier Authentication Library creates a /run/courier/authdaemon directory with weak permissions, allowing an attacker to read user information. This may include a cleartext password in some configurations. In general, it includes the user's existence, uid and gids, home and/or Maildir directory, quota, and some type of password information (such as a hash).

For Debian 9 stretch, this problem has been fixed in version 0.66.4-9+deb9u1.

We recommend that you upgrade your courier-authlib packages.

For the detailed security status of courier-authlib please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: