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Dovecot User Authentication Denial of Service Vulnerability
Information
Severity
Severity
Medium
Family
Family
Denial of Service
CVSSv2 Base
CVSSv2 Base
5.0
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Solution Type
Solution Type
Vendor Patch
Created
Created
5 years ago
Modified
Modified
5 years ago
Summary
Dovecot is prone to a Denial of Service vulnerability within the user authentication.
Insight
Insight
When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client is sent through var_expand() to perform %variable expansion. Sending specially crafed %variable fields can result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.
Affected Software
Affected Software
Dovecot versions 2.2.26 through 2.2.28.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 2.2.29.