#VU59879 Input validation error in Cyrus IMAP Server - CVE-2021-33582
Published: January 20, 2022
Vulnerability identifier: #VU59879
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-33582
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Cyrus IMAP Server
Cyrus IMAP Server
Software vendor:
Carnegie Mellon University
Carnegie Mellon University
Description
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.
External links
- 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