Dovecot is prone to a remote denial-of-service vulnerability. Attackers can exploit this issue to crash the affected application, denying service to legitimate users. Dovecot versions 2.3.9 and 2.3.9.1 are vulnerable.
Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.
Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to detect and block attacks and anomalous activity such as requests containing suspicious URI sequences. Since the webserver may log such requests, review its logs regularly.
Updates are available. Please see the references or vendor advisory for more information.
CPE | Name | Operator | Version |
---|---|---|---|
dovecot dovecot | eq | 2.3.9.1 | |
dovecot dovecot | eq | 2.3.9 |
www.dovecot.org/
bugzilla.redhat.com/show_bug.cgi?id=1782785
dovecot.org/list/dovecot-news/2019-December/000428.html
dovecot.org/pipermail/dovecot-news/2019-December/000425.html
dovecot.org/pipermail/dovecot-news/2019-December/000426.html
github.com/dovecot/core/commit/1307766b6f5d97341a47376657d342bcefd10f1b
github.com/dovecot/core/commit/393a8cabf4dad893bf2ec60bf96cfde7a0c58432
github.com/dovecot/core/commit/82c948db496cdc2d25b40eb8613c1eaa5c622384
github.com/dovecot/core/compare/393a8cabf4dad893bf2ec60bf96cfde7a0c58432%5E..1307766b6f5d97341a47376657d342bcefd10f1b.patch