There is a heap corruption vulnerability in multiple Symantec firewall products in which attempts to process a specially crafted NetBIOS Name Service (NBNS) response packet could allow an unauthenticated, remote attacker to execute arbitrary code with kernel privileges.
Symantec offers a suite of corporate and consumer security products including a firewall application. The firewall application includes a SYMDNS.SYS driver, which is responsible for validating NBNS and DNS responses. There is a vulnerability in the routine responsible for processing incoming NBNS responses which could result in heap memory corruption. This routine fails to perform adequate bounds checking on the NBNS response packets. By supplying a specially crafted NBNS packet, an attacker could potentially overwrite arbitrary locations in memory.
According to the Symantec Advisory, the following products are affected:
An unauthenticated, remote attacker could cause a denial of service condition or potentially execute arbitrary code with kernel privileges on a vulnerable system. According to the eEye Digital Security Advisory, in order for this vulnerability to be exploited, the firewall must be configured to allow NetBIOS Name Service (NBNS) traffic. This configuration is not present by default.
Symantec recommends that clients running corporate versions of the affected products apply patches obtained through their appropriate support channels.
This vulnerability was reported by eEye Digital Security.
This document was written by Damon Morda and based on information contained in the eEye Digital Security Advisory.
|Date First Published:||2004-05-13|
|Date Last Updated:||2004-05-13 17:38 UTC|