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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

4 years ago

Modified

Modified

4 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.

Common Vulnerabilities and Exposures (CVE)