|Check Point Reference:||SBP-2010-16|
|Date Published:||13 Apr 2010|
|Last Updated:||28 Jun 2017|
|Protection Provided by:||
|Who is Vulnerable?|
|Vulnerability Description||A denial of service vulnerability has been reported in the way that Microsoft Windows Simple Mail Transfer Protocol (SMTP) component handles specially crafted DNS Mail Exchanger (MX) resource records.The mail exchange (MX) resource record specifies a mail exchange server for a DNS domain name. A remote attacker may trigger this vulnerability via a specially crafted DNS request with a null prefix in the MX record.Successful exploitation of this issue could cause the affected system to stop accepting requests.Security Gateway: R70VPN-1 Power/UTM: NGX R65VPN-1 Power VSX: NGX R65|
This protection detects and blocks null prefix of DNS MX records.
In order for the protection to be activated, update your Security Gateway product to the latest IPS update.For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.
This protection's log will contain the following information:
Attack Name: DNS Enforcement Violation
Attack Information: DNS MX record null prefix