Cisco Remote PHY Software IPv4 Fragment resource management

Summaryinfo

A vulnerability has been found in Cisco Remote PHY Software and classified as critical. This vulnerability affects unknown code of the component IPv4 Fragment Handler. This manipulation causes resource management. This vulnerability is tracked as CVE-2018-15391. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Cisco Remote PHY Software (the affected version unknown) and classified as critical. Affected by this vulnerability is an unknown part of the component IPv4 Fragment Handler. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in certain IPv4 fragment-processing functions of Cisco Remote PHY Software could allow an unauthenticated, remote attacker to impact traffic passing through a device, potentially causing a denial of service (DoS) condition. The vulnerability is due to the affected software not validating and calculating certain numerical values in IPv4 packets that are sent to an affected device. An attacker could exploit this vulnerability by sending malformed IPv4 traffic to an affected device. A successful exploit could allow the attacker to disrupt the flow of certain IPv4 traffic passing through an affected device, which could result in a DoS condition.

The bug was discovered 10/03/2018. The weakness was disclosed 10/05/2018 as cisco-sa-20181003-phy-ipv4-dos as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is known as CVE-2018-15391 since 08/17/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/30/2020).

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 $5k-$25k.

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Cisco

Name

• Remote PHY Software

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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