Description
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).
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | courier-authlib | 0.71.1-2 | — |
| Debian 13 | courier-authlib | 0.71.1-2 | — |
| Debian 12 | courier-authlib | 0.71.1-2 | — |
| Debian 9 | courier-authlib | 0.66.4-9+deb9u1 | DLA-2625-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | courier-authlib | No fix yet | — |
| Ubuntu 20.04 LTS | courier-authlib | No fix yet | — |
| Ubuntu 18.04 LTS | courier-authlib | No fix yet | — |
| Ubuntu 16.04 LTS | courier-authlib | No fix yet | — |
Advisories 1
- DLA-2625-1 courier-authlib - security update Debian Security (DSA / DLA) · Mar 9, 2026