Title: SquidGuard NULL URL Character Unauthorized Access Vulnerability
Severity: HIGH
Description:
SquidGuard is an application that acts as a filter, redirector and access controller for Squid. It is freely available under the GNU Public License and can be run on Unix and Unix like platforms. Squid is a freely available, open source web proxy software package.
Reportedly SquidGaurd is prone to a remote NULL URL character unauthorized access vulnerability. This issue is due to a failure of the application to properly filter out invalid URIs.
The problem presents itself when a URI that is designed to access a specific location with a supplied username, contains '%00' characters. These characters will be interpreted as a NULL due to UTF-8 encoding. This sequence may be placed as part of the username value prior to the @ symbol in the malicious URI.
Successful exploitation of this issue may allow a remote attacker to bypass access controls resulting in unauthorized access to attacker-specified resources. This may allow the attacker to gain unauthorized access to sensitive resources.
Although it has not been confirmed, this issue may be related to the issue defined in BID 9778.
Affected Products:
- squidGuard squidGuard 1.0.0.0
- squidGuard squidGuard 1.1.0.0
- squidGuard squidGuard 1.1.1
- squidGuard squidGuard 1.1.2
- squidGuard squidGuard 1.1.3
- squidGuard squidGuard 1.1.4
- squidGuard squidGuard 1.1.5
- squidGuard squidGuard 1.2.0.0
References:
- squidGuard: Product Home Page
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