Dovecot TAB characters authentication bypass
| dovecot-tab-authentication-bypass (41085) |  Medium Risk |
Description:
Dovecot could allow a remote attacker to bypass the authentication process, caused by an error during the processing of passwords. By sending a specially-crafted password containing TAB characters, a remote attacker could bypass the authentication process to login without valid credentials and set the values for new internal fields.
Platforms Affected:
- Canonical, Ubuntu 6.06 LTS
- Canonical, Ubuntu 6.10
- Canonical, Ubuntu 7.04
- Canonical, Ubuntu 7.10
- Debian, Debian Linux 4.0
- Gentoo, Linux
- Timo Sirainen, Dovecot prior to 1.0.13
- Timo Sirainen, Dovecot prior to 1.1rc3
Remedy:
Upgrade to the latest version of Dovecot (1.0.13 or later), available from the Dovecot Download Web site. See References.
Consequences:
Bypass Security
References:
- Dovecot Changelog, Sun Mar 9 13:09:44 EET 2008, Security hole #6: Some passdbs allowed users to log in without a valid password at http://dovecot.org/list/dovecot-news/2008-March/000064.html.
- Dovecot Download Web site, Secure IMAP server at http://dovecot.org/download.html.
- BID-28181: Dovecot 'Tab' Character Password Check Security Bypass Vulnerability
- CVE-2008-1218: 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.
- DSA-1516: dovecot -- privilege escalation
- GLSA-200803-25: Dovecot: Multiple vulnerabilities
- SA29295: Dovecot Authentication Bypass Vulnerability
- SUSE-SR:2008:020: SUSE Security Summary Report
- USN-593-1: Dovecot vulnerabilities
Reported:
Mar 09, 2008
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