A vulnerability was found in CUJO Smart Firewall 7003 (Firewall Software). It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component mdnscap. The manipulation as part of a mDNS Packet leads to a integer underflow vulnerability. The CWE definition for the vulnerability is CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. As an impact it is known to affect availability. The summary by CVE is:

An exploitable integer underflow vulnerability exists in the mdnscap binary of the CUJO Smart Firewall, version 7003. When parsing SRV records in an mDNS packet, the "RDLENGTH" value is handled incorrectly, leading to an out-of-bounds access that crashes the mdnscap process. An unauthenticated attacker can send an mDNS message to trigger this vulnerability.

The bug was discovered 03/19/2019. The weakness was presented 03/21/2019. This vulnerability is known as CVE-2018-4011 since 01/02/2018. 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 vulnerability was handled as a non-public zero-day exploit for at least 2 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.

Productinfo

Type

• Firewall Software

Vendor

• CUJO

Name

• Smart Firewall

Version

• 7003

CPE 2.3info

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CPE 2.2info

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