SB2021090136 - Denial of service in Cyrus IMAP
Published: September 1, 2021 Updated: January 20, 2022
Security Bulletin ID
SB2021090136
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2021-33582)
The vulnerability allows remote attackers to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input that is mishandled during hash-table interaction. A remote attacker can cause a denial of service (multiple-minute daemon hang) via input that is mishandled during hash-table interaction. Because there are many insertions into a single bucket, strcmp becomes slow.
Remediation
Install update from vendor's website.
References
- https://www.cyrusimap.org/imap/download/release-notes/index.html
- https://github.com/cyrusimap/cyrus-imapd/commits/master
- https://cyrus.topicbox.com/groups/announce/T3dde0a2352462975-M1386fc44adf967e072f8df13/cyrus-imap-3-4-2-3-2-8-and-3-0-16-released
- https://github.com/cyrusimap/cyrus-imapd/security/advisories