A vulnerability has been found in Darren Reed IPFilter 3.4.25 and classified as problematic. Affected by this vulnerability is an unknown function of the component TTL Handler. The manipulation with an unknown input leads to a information disclosure vulnerability (Filter). The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

IPFilter 3.4.25 and earlier sets a different TTL when a port is being filtered than when it is not being filtered, which allows remote attackers to identify filtered ports by comparing TTLs.

The weakness was released 08/12/2002 by Meder Kydyraliev (Website). It is possible to read the advisory at securityfocus.com. This vulnerability is known as CVE-2002-0515. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (8738) and SecurityFocus (BID 4403†). Entry connected to this vulnerability is available at VDB-18570. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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• Darren Reed

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• IPFilter

Version

• 3.4.25

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