Multiple vulnerabilities have been discovered in Symantec Web Gateway, which can be exploited by malicious people to disclose potentially sensitive information, conduct cross-site scripting attacks, manipulate certain data, and compromise a vulnerable system.

1) Input passed via the "ip", "subnet", and "gateway" POST parameters to spywall/ipchange.php is not properly verified before being used in a call to "exec()". This can be exploited to inject arbitrary commands.

2) The ciu/uploadFile.php and ciu/remoteRepairs.php scripts allow the upload of files with arbitrary extensions to arbitrary locations. This can be exploited to execute arbitrary code by uploading a script file, but requires circumventing the .htaccess protection on ciu directory.

3) Input passed via the "d" parameter to spywall/download_file.php is not properly verified before being used to display and delete files. This can be exploited to disclose the contents of arbitrary files or delete arbitrary files via directory traversal sequences.

4) Certain unspecified input is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

5) Input passed via the "err" parameter to spywall/previewProxyError.php is not properly verified before being used to display files. This can be exploited to disclose the contents of arbitrary files via directory traversal sequences.

6) Input passed via the "relfile" parameter to spywall/releasenotes.php is not properly verified before being used to include files. This can be exploited to include arbitrary files from local resources via directory traversal attacks.

Successful exploitation of this vulnerability allows execution of arbitrary code.

7) Input passed via the "auto", "duplex", and "speed" POST parameters to spywall/network.php (when "name" is set to "lan", "wan", or "monitor") is not properly verified before being used in a call to "exec()". This can be exploited to inject arbitrary commands.

The vulnerabilities are reported in version 5.0.2.8 and confirmed in version 5.0.2. Other versions may also be affected.

Solution
Update to version 5.0.3.

Provided and/or discovered by
1-3, 7) Tenable Network Security via ZDI. The vendor also credits an anonymous person via SecuriTeam Secure Disclosure.
4) The vendor credits Ajay Pal Singh Atwal and an anonymous person.
5, 6) S2 Crew

Changelog
Further details available to Secunia VIM customers

Original Advisory
Symantec:
http://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=2012&suid=20120517_00

ZDI:
http://www.zerodayinitiative.com/advisories/ZDI-12-090/
http://www.zerodayinitiative.com/advisories/ZDI-12-091/

S2 Crew:
http://packetstormsecurity.org/files/114231/Symantec-Web-Gateway-5.0.28-LFI-Code-Execution.html

Deep Links
Links available to Secunia VIM customers