Symantec Web Gateway fails to properly validate/sanitize certain external input, allowing the potential for reflected cross-site scripting attempts. These attempts may come from authorized, but non-privileged network users or, in some instances, from unauthorized external individuals who are able to entice an actively logged-in web console user to click on a maliciously-crafted HTML link. Successful targeting of these issues could result in an authorized Symantec Web Gateway user’s management console session with associated privileges being hijacked.
Cross-site scripting is a trust exploitation that requires enticing a previously authenticated user to click on a malicious HTML link. An external attacker would need to successfully entice an authorized, privileged Symantec Web Gateway management console user to visit a malicious web site or click on a malicious HTML link in an email in any attempt to take advantage of this issue. In a normal installation, the Symantec Web Gateway management console should not be accessible external to the network environment.
Symantec engineers validated these issues. A Symantec Web Gateway update, version 5.2.7, has been released to address them. Symantec Web Gateway's latest release is currently available to customers through normal support locations.
Symantec is not aware of exploitation of or adverse customer impact from these issues.
Customers should ensure they are on the latest release of Symantec Web Gateway, currently 5.2.7, and running the latest database update. To confirm customers are running the latest updates check the “Current Software Version -> Current Version” on the Administration->Updates page. Alternatively, customers can click the “Check for Updates” button on the Administration->Updates page to verify that they are running the latest software version.
Symantec will be releasing the following IPS signature to detect/prevent attempts against CVE-2016-9096 in Symantec Web Gateway. Detections will be available through normal Symantec security update channels.
26812 - Web Attack: Symantec Web Gateway XSS
Symantec recommends the following measures to reduce risk of attack:
Restrict access to administrative or management systems to authorized privileged users.
Restrict remote access to trusted/authorized systems only.
Run under the principle of least privilege, where possible, to limit the impact of potential exploit.
Keep all operating systems and applications current with vendor patches.
Follow a multi-layered approach to security. At a minimum, run both firewall and anti-malware applications to provide multiple points of detection and protection to both inbound and outbound threats.
Deploy network and host-based intrusion detection systems to monitor network traffic for signs of anomalous or suspicious activity. This may aid in the detection of attacks or malicious activity related to the exploitation of latent vulnerabilities.
Sanehdeep Singh, saneh447 at gmail.com (CVE-2016-9096)
This is machine translated content
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