Cisco NX-OS CLI os command injection

Summaryinfo

A vulnerability classified as critical was found in Cisco NX-OS. This impacts an unknown function of the component CLI. Executing a manipulation can lead to os command injection. This vulnerability is registered as CVE-2019-1769. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in Cisco NX-OS (Router Operating System) (version unknown). This vulnerability affects an unknown function of the component CLI. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated, local attacker with administrator credentials to execute arbitrary commands on the underlying Linux operating system of an attached line card with the privilege level of root. The vulnerability is due to insufficient validation of arguments passed to a specific CLI command on the affected device. An attacker could exploit this vulnerability by including malicious input as the argument of an affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying Linux operating system of an attached line card with elevated privileges. An attacker would need valid administrator credentials to exploit this vulnerability.

The bug was discovered 05/15/2019. The weakness was published 05/15/2019 as cisco-sa-20190515-nxos-linecar as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability was named CVE-2019-1769 since 12/06/2018. The attack needs to be approached locally. The successful exploitation requires a single 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 09/21/2023). The MITRE ATT&CK project declares the attack technique as T1202.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 316466 (Cisco NX-OS Software Line Card Command Injection Vulnerability (CVE-2019-1769)(cisco-sa-20190515-nxos-linecardinj-1769)).

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

Similar entry is available at VDB-135101. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• NX-OS

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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