Cisco NFVIS 3.7.1 scp Server Argument input validation

Summaryinfo

A vulnerability described as critical has been identified in Cisco NFVIS 3.7.1. This issue affects some unknown processing of the component scp Server. Such manipulation as part of Argument leads to input validation. This vulnerability is documented as CVE-2018-0279. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Cisco NFVIS 3.7.1. It has been rated as critical. Affected by this issue is an unknown code block of the component scp Server. The manipulation as part of a Argument leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in the Secure Copy Protocol (SCP) server of Cisco Enterprise NFV Infrastructure Software (NFVIS) could allow an authenticated, remote attacker to access the shell of the underlying Linux operating system on the affected device. The vulnerability is due to improper input validation of command arguments. An attacker could exploit this vulnerability by using crafted arguments when opening a connection to the affected device. An exploit could allow the attacker to gain shell access with a non-root user account to the underlying Linux operating system on the affected device. Due to the system design, access to the Linux shell could allow execution of additional attacks that may have a significant impact on the affected system. This vulnerability affects Cisco devices that are running release 3.7.1, 3.6.3, or earlier releases of Cisco Enterprise NFV Infrastructure Software (NFVIS) when access to the SCP server is allowed on the affected device. Cisco NFVIS Releases 3.5.x and 3.6.x do allow access to the SCP server by default, while Cisco NFVIS Release 3.7.1 does not. Cisco Bug IDs: CSCvh25026.

The bug was discovered 05/16/2018. The weakness was released 05/17/2018 with Cisco as cisco-sa-20180516-nfvis as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability is handled as CVE-2018-0279 since 11/27/2017. The attack may be launched remotely. The requirement for exploitation is a simple authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 02/06/2020).

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 vulnerability database at SecurityFocus (BID 104243†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Cisco

Name

• NFVIS

Version

• 3.7.1

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Once again VulDB remains the best source for vulnerability data.

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