Cisco NX-OS Remote Package Manager os command injection

Summaryinfo

A vulnerability was found in Cisco NX-OS and classified as critical. The impacted element is an unknown function of the component Remote Package Manager. Executing a manipulation can lead to os command injection. This vulnerability is handled as CVE-2019-1732. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Cisco NX-OS (Router Operating System) (the affected version is unknown) and classified as critical. This vulnerability affects an unknown code of the component Remote Package Manager. 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 Remote Package Manager (RPM) subsystem of Cisco NX-OS Software could allow an authenticated, local attacker with administrator credentials to leverage a time-of-check, time-of-use (TOCTOU) race condition to corrupt local variables, which could lead to arbitrary command injection. The vulnerability is due to the lack of a proper locking mechanism on critical variables that need to stay static until used. An attacker could exploit this vulnerability by authenticating to an affected device and issuing a set of RPM-related CLI commands. A successful exploit could allow the attacker to perform arbitrary command injection. The attacker would need administrator credentials for the targeted device.

The bug was discovered 05/15/2019. The weakness was released 05/15/2019 as cisco-sa-20190515-nxos-rpm-inj as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability was named CVE-2019-1732 since 12/06/2018. The attack needs to be approached locally. A single authentication is needed for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/19/2023). The MITRE ATT&CK project declares the attack technique as T1202.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 316464 (Cisco NX-OS Software Remote Package Manager Command Injection Vulnerability(cisco-sa-20190515-nxos-rpm-injec)).

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-135079, VDB-135078, VDB-135077 and VDB-135075. 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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