An issue was discovered in Prevx v3.0.5.220 allowing attackers to cause a denial of service via sending IOCTL code 0x22E044 to the pxscan.sys driver. Any processes listed under registry key HKEY_LOCAL_MACHINESystemCurrentControlSetServicespxscanFiles will be terminated.
The product does not properly control the allocation and maintenance of a limited resource.
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.