Phoenix mGuard up to 8.4.2 VPN Request resource consumption

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Phoenix mGuard up to 8.4.2. This issue affects some unknown processing of the component VPN Request Handler. The manipulation leads to resource consumption. This vulnerability is documented as CVE-2017-7935. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Phoenix mGuard up to 8.4.2. It has been rated as problematic. This issue affects an unknown functionality of the component VPN Request Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

A Resource Exhaustion issue was discovered in Phoenix Contact GmbH mGuard firmware versions 8.3.0 to 8.4.2. An attacker may compromise the device's availability by performing multiple initial VPN requests.

The bug was discovered 05/11/2017. The weakness was released 05/19/2017 (Website). The advisory is shared at ics-cert.us-cert.gov. The identification of this vulnerability is CVE-2017-7935 since 04/18/2017. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $0-$5k.

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

Entry connected to this vulnerability is available at VDB-101502. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Phoenix

Name

• mGuard

Version

• 8.4.0
• 8.4.1
• 8.4.2

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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