Kerio MailServer SYN flood denial of service
| kerio-mailserver-syn-dos (9904) |  Low Risk |
Description:
Kerio MailServer is vulnerable to a denial of service attack in multiple mail services. If a remote attacker sends multiple SYN packets to either the POP3, SMTP, Internet Message Access Protocol (IMAP), Secure IMAP, POP3S, Webmail, or Secure Webmail service, the attacker could cause the targeted service to stop responding. The service resumes normal functionality after a short period of time.
Platforms Affected:
- Kerio, Kerio MailServer 5.0
Remedy:
Upgrade to Kerio MailServer 5.1.7 or later, released October 22, 2002 from the Kerio Technologies, Inc. Web site. See References.
If you cannot upgrade immediately, filter all mail services to restrict access to only trusted sources from within the network.
Consequences:
Denial of Service
References:
- BugTraq Mailing List, Tue Aug 27 2002 - 10:44:30 CDT, Re: Kerio Mail Server Multiple Security Vulnerabilities at http://archives.neohapsis.com/archives/bugtraq/2002-08/0299.html.
- BugTraq Mailing List, Wed Aug 28 2002 - 19:35:56 CDT, Re: Kerio Mail Server Multiple Security vulnerabilities at http://archives.neohapsis.com/archives/bugtraq/2002-08/0312.html.
- Kerio Technologies, Inc. Web site, Kerio MailServer - secure mailserver at http://www.kerio.com/us/kms_home.html.
- BID-5505: Kerio MailServer Multiple SYN Packet Denial Of Service Vulnerability
- CVE-2002-1433: Kerio MailServer 5.0 allows remote attackers to cause a denial of service (hang) via SYN packets to the supported network services.
Reported:
Aug 19, 2002
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