Description
The message parsing feature in Dovecot 1.1.4 and 1.1.5, when using the FETCH ENVELOPE command in the IMAP client, allows remote attackers to cause a denial of service (persistent crash) via an email with a malformed From address, which triggers an assertion error, aka "invalid message address parsing bug."
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 | dovecot | 1:1.1.7-1 | — |
| Debian 13 | dovecot | 1:1.1.7-1 | — |
| Debian 12 | dovecot | 1:1.1.7-1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Dovecot 1.1.x - Invalid Message Address Parsing Denial of Service EDB-32551 · dos · Oct 30, 2008 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- [Dovecot-news] 20081030 v1.1.6 released mailing-list
- 33149 third-party-advisory
- dovecot-mail-header-dos(46227) vdb-entry
- USN-666-1 vendor-advisory
- 31997 vdb-entry
- GLSA-200812-16 vendor-advisory
- 32677 third-party-advisory
- 32479 third-party-advisory