Resource exhaustion in Dovecot - CVE-2017-2669
Published: April 10, 2017 / Updated: November 28, 2018
Vulnerability identifier: #VU16153
CSH Severity: Low
CVSS v4.0: 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:Clear
CVE-ID: CVE-2017-2669
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Dovecot
Affected software:
Dovecot
Dovecot
Detailed vulnerability description
The vulnerability allows a remote attacker to perform denial of service (DoS)M attack.
The vulnerability exists due to the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion when 'dict' passdb and userdb were used for user authentication. A remote attacker can send specially crafted %variable fields, use excessive memory and cause the process to crash.
How to mitigate CVE-2017-2669
Update to version 2.2.29.