Malicious scripts hidden in URLs can be executed.
A vulnerability has been discovered in Symantec Web Security. Symantec Web Security fails to check and parse HTML tags in URLs included in error or block page messages displayed to the client, in the event of a blocked page.
An attacker can potentially include malicious scripts in the URL, which the client executes in the context of the site specified in the URL, in the event that the page is blocked.
Symantec Web Security 2.5, 3.0.0, and 3.0.1
Symantec verified that this vulnerability exists in the currently supported versions of Symantec Web Security 3.0.1. This issue is fixed in the latest release of Symantec Web Security 3.0.1, build 62.
The Symantec Web Security default block pages can be modified to not return the offending URL to the client.
Symantec takes the security and proper functionality of its products seriously. Symantec appreciates the efforts of Oliver.Karow and Brian Soby of Raytheon who independently discovered this vulnerability. Their assistance in the resolution of this vulnerability was indispensable.
Symantec takes the security and proper functionality of our products very seriously. As founding members of the Organization for Internet Safety (OISafety), Symantec supports and follows the principles of responsible disclosure. Symantec also subscribes to the vulnerability disclosure guidelines outlined by the National Infrastructure Advisory Council (NIAC).
Please contact firstname.lastname@example.org if you feel you have discovered a security issue in a Symantec product. A Symantec Product Security team member will contact you regarding your submission. Symantec strongly recommends using encrypted email for reporting vulnerability information to email@example.com. The Symantec Product Security PGP key can be found at the end of this message.
Symantec has developed a Product Vulnerability Response document outlining the process we follow in addressing suspected vulnerabilities in our products. This document is available below.
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Last modified on: Monday, 25-Oct-04 15:20:41