Description
Argument injection vulnerability in Dovecot 1.0.x before 1.0.13, and 1.1.x before 1.1.rc3, when using blocking passdbs, allows remote attackers to bypass the password check via a password containing TAB characters, which are treated as argument delimiters that enable the skip_password_check field to be specified.
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 | 1:1.0.13-1 | — |
| Debian 13 | dovecot | 1:1.0.13-1 | — |
| Debian 12 | dovecot | 1:1.0.13-1 | — |
| Debian 4.0 | dovecot | 1.0.rc15-2etch4 | DSA-1516-1 |
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 IMAP 1.0.10 < 1.1rc2 - Remote Email Disclosure EDB-5257 · remote · Mar 14, 2008 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- DSA-1516-1 dovecot - privilege escalation Debian Security (DSA / DLA) · Mar 9, 2026
References
- GLSA-200803-25 vendor-advisory
- 29295 third-party-advisory
- dovecot-tab-authentication-bypass(41085) vdb-entry
- 5257 exploit
- 29557 third-party-advisory
- DSA-1516 vendor-advisory
- http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0108
- USN-593-1 vendor-advisory
- FEDORA-2008-2475 vendor-advisory
- 29364 third-party-advisory
- SUSE-SR:2008:020 vendor-advisory
- https://issues.rpath.com/browse/RPL-2341
- [Dovecot-news] 20080309 Security hole #6: Some passdbs allowed users to log in without a valid password mailing-list
- [Dovecot-news] 20080309 v1.0.13 and v1.1.rc3 released mailing-list
- 29226 third-party-advisory
- 20080312 rPSA-2008-0108-1 dovecot mailing-list
- 32151 third-party-advisory
- 29385 third-party-advisory
- FEDORA-2008-2464 vendor-advisory
- 28181 vdb-entry
- 29396 third-party-advisory