TITLE:
Cyber Web Filter IP Address Restriction Security Bypass

SECUNIA ADVISORY ID:
SA13024

VERIFY ADVISORY:
http://secunia.com/advisories/13024/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From local network

SOFTWARE:
Cyber Web Filter 2.x
http://secunia.com/product/4188/

DESCRIPTION:
Ziv Kamir has discovered a vulnerability in Cyber Web Filter, which
can be exploited by malicious people to bypass certain security
restrictions.

The web filter can be configured to restrict access based on the
destination IP address of a website. The vulnerability is caused due
to insufficient validation of IP addresses in client requests, which
can be exploited to bypass some access rules by using octal numbers
in the IP address.

The vulnerability has been confirmed in version 2.00. Other versions
may also be affected.

SOLUTION:
Carefully use regular expressions to restrict access.

Use another product.

PROVIDED AND/OR DISCOVERED BY:
Ziv Kamir

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