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Vulnerability of Outpost Firewall: denial of service of SandBox

Synthesis of the vulnerability 

A local attacker can send malicious data to the Sandbox driver in order to stop Outpost Firewall.
Vulnerable software: Outpost Firewall.
Severity of this announce: 1/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 02/11/2006.
Revision date: 16/11/2006.
Références of this computer vulnerability: BID-20860, BID-21097, CVE-2006-5721, CVE-2006-7160, VIGILANCE-VUL-6271.

Description of the vulnerability 

The Outpost firewall has a sandbox to simulate the execution of programs. It is reachable via \Device\SandBox. This Sandbox uses the SSDT (System Service Descriptor Table) to hook (redirect) functions.

However, hooks for NtAssignProcessToJobObject, NtCreateKey, NtCreateThread, NtDeleteFile, NtLoadDriver, NtOpenProcess, NtProtectVirtualMemory, NtReplaceKey, NtTerminateProcess, NtTerminateThread, NtUnloadDriver and NtWriteVirtualMemory functions do not correctly check their parameters.

A local attacker can therefore create a program using these functions with malicious parameters, in order to stop the firewall.
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This vulnerability impacts software or systems such as Outpost Firewall.

Our Vigil@nce team determined that the severity of this security announce is low.

The trust level is of type confirmed by a trusted third party, with an origin of user shell.

This bulletin is about 2 vulnerabilities.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this computer vulnerability note.

Solutions for this threat 

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