Mandriva Linux Security Advisory 2015-113 - Updated dovecot packages fix security vulnerability. Dovecot before 2.2.13 is vulnerable to a DoS attack against imap/pop3-login processes. If SSL/TLS handshake was started but wasn't finished, the login process attempted to eventually forcibly disconnect the client, but failed to do it correctly. This could have left the connections hanging around for a long time.
02bb0de3a8646cbeff42c1216386daf1423a1ee06013225762cc7befed905053Gentoo Linux Security Advisory 201412-3 - A vulnerability in Dovecot could allow a remote attacker to create a Denial of Service condition. Versions less than 2.2.13 are affected.
3d75dd34d40e4219d0c2b708283b8f3aac32e24327f5de51520a41dbd3e58729Red Hat Security Advisory 2014-0790-01 - Dovecot is an IMAP server, written with security primarily in mind, for Linux and other UNIX-like systems. It also contains a small POP3 server. It supports mail in both the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages. It was discovered that Dovecot did not properly discard connections trapped in the SSL/TLS handshake phase. A remote attacker could use this flaw to cause a denial of service on an IMAP/POP3 server by exhausting the pool of available connections and preventing further, legitimate connections to the IMAP/POP3 server to be made.
0e13ed0ca0865bb4148cdab7442ec2e3cbc2d65acb04cd37108d09f3f118e88cDebian Linux Security Advisory 2954-1 - It was discovered that the Dovecot email server is vulnerable to a denial of service attack against imap/pop3-login processes due to incorrect handling of the closure of inactive SSL/TLS connections.
f7b574186100faa3350fd62bea077a55c41e1162c8a545f104e6d1fc73023950Mandriva Linux Security Advisory 2014-099 - Dovecot 1.1 before 2.2.13 and dovecot-ee before 2.1.7.7 and 2.2.x before 2.2.12.12 does not properly close old connections, which allows remote attackers to cause a denial of service via an incomplete SSL/TLS handshake for an IMAP/POP3 connection. The updated packages have been patched to correct this issue.
b82ca56efd8853684a23112efde2dd54f66c4a5430e065066c7fe0aae9e7b563Ubuntu Security Notice 2213-1 - It was discovered that Dovecot incorrectly handled closing inactive SSL/TLS connections. A remote attacker could use this issue to cause Dovecot to stop responding to new connections, resulting in a denial of service.
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