Cisco NX-OS CLI command injection

Summaryinfo

A vulnerability described as critical has been identified in Cisco NX-OS. Affected is an unknown function of the component CLI. Executing a manipulation can lead to command injection. This vulnerability is tracked as CVE-2019-1783. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability has been found in Cisco NX-OS (Router Operating System) (unknown version) and classified as critical. This vulnerability affects an unknown code block of the component CLI. The manipulation with an unknown input leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended 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 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 with elevated privileges. An attacker would need valid administrator credentials to exploit this vulnerability.

The bug was discovered 05/15/2019. The weakness was disclosed 05/15/2019 as cisco-sa-20190515-nxos-cmdinj- as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability was named CVE-2019-1783 since 12/06/2018. The attack needs to be approached locally. The requirement for exploitation is 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.

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

The entries VDB-135078, VDB-135101, VDB-135105 and VDB-135106 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• NX-OS

License

• commercial

Website

• Vendor: https://www.cisco.com/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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