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.
*CVSS:
| Base Score: | 7.5 |
| Access Vector: | Network |
| Access Complexity: | Low |
| Authentication: | None |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | Partial |
| Temporal Score: | 6.2 |
| Exploitability: | Functional |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
Upgrade to the latest version of Dovecot (1.0.13 or later), available from the Dovecot Download Web site. See References.
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.
- Dovecot Download Web site: Secure IMAP server.
- 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
Platforms Affected:
- Canonical Ubuntu 6.06 LTS
- Canonical Ubuntu 6.10
- Canonical Ubuntu 7.04
- Canonical Ubuntu 7.10
- Debian Debian Linux 4.0
- Dovecot Dovecot prior to 1.0.13
- Dovecot Dovecot prior to 1.1rc3
- Gentoo Linux
Reported:
Mar 09, 2008
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.