Cisco NX-OS CLI input validation

Summaryinfo

A vulnerability described as critical has been identified in Cisco NX-OS. Affected by this vulnerability is an unknown functionality of the component CLI. Such manipulation leads to input validation. This vulnerability is documented as CVE-2017-12338. The attack needs to be performed locally. There is not any exploit available.

Detailsinfo

A vulnerability was found in Cisco NX-OS (Router Operating System) (unknown version) and classified as critical. Affected by this issue is an unknown code block of the component CLI. The manipulation with an unknown input 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 CLI of Cisco NX-OS System Software could allow an authenticated, local attacker to read the contents of arbitrary files. The vulnerability is due to insufficient input validation for a specific CLI command. An attacker could exploit this vulnerability by issuing a crafted command on the CLI. An exploit could allow the attacker unauthorized access to read arbitrary files on the underlying local file system. On products that support multiple virtual device contexts (VDCs), this vulnerability could allow an attacker to read files from any VDC. This vulnerability affects the following products running Cisco NX-OS System Software: Multilayer Director Switches, Nexus 2000 Series Fabric Extenders, Nexus 3000 Series Switches, Nexus 5000 Series Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode, Nexus 9000 Series Switches in standalone NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules, Unified Computing System Manager. Cisco Bug IDs: CSCve51707, CSCve93961, CSCve93964, CSCve93965, CSCve93968, CSCve93974, CSCve93976.

The bug was discovered 11/29/2017. The weakness was released 11/30/2017 as cisco-sa-20171129-nxos6 as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability is handled as CVE-2017-12338 since 08/03/2017. Local access is required to approach this attack. The requirement for exploitation is a simple authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 01/25/2021).

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316200 (Cisco NX-OS System Software CLI Arbitrary File Read Vulnerability (cisco-sa-20171129-nxos6)).

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

Entries connected to this vulnerability are available at VDB-110070, VDB-110069, VDB-110068 and VDB-110067. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• NX-OS

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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