Description
Courier sqwebmail before 0.40.0 does not quickly drop privileges after startup in certain cases, which could allow local users to read arbitrary files.
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 | 0.40.0-1 | — |
| Debian 13 | courier | 0.40.0-1 | — |
| Debian 12 | courier | 0.40.0-1 | — |
| Debian 3.0 | courier | 0.37.3-2.3 | DSA-197 |
Advisories 1
- DSA-197 courier - buffer overflow Debian Security (DSA / DLA) · Mar 9, 2026
References
- courier-mta-insecure-permissions(10643) vdb-entry
- 6189 vdb-entry
- DSA-197 vendor-advisory
- 20021119 GLSA: courier mailing-list