Cisco NX-OS on Nexus 9000 ACI Mode resource management

Summaryinfo

A vulnerability, which was classified as problematic, was found in Cisco NX-OS on Nexus 9000. Affected by this vulnerability is an unknown functionality of the component ACI Mode. Executing a manipulation can lead to resource management. This vulnerability is tracked as CVE-2019-1587. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Cisco NX-OS on Nexus 9000 (Router Operating System) (affected version not known). It has been declared as problematic. This vulnerability affects some unknown functionality of the component ACI Mode. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect confidentiality. CVE summarizes:

A vulnerability in Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an authenticated, remote attacker to access sensitive information. The vulnerability occurs because the affected software does not properly validate user-supplied input. An attacker could exploit this vulnerability by issuing certain commands with filtered query results on the device. This action may cause returned messages to display confidential system information. A successful exploit could allow the attacker to read sensitive information on the device.

The bug was discovered 05/01/2019. The weakness was disclosed 05/03/2019 as cisco-sa-20190501-aci-filter-q as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability was named CVE-2019-1587 since 12/06/2018. The attack can be initiated remotely. A single authentication is required 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 09/12/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 2 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 316438 (Cisco Nexus 9000 Series Fabric Switches Application Centric Infrastructure Mode Multiple Vulnerabilities(cisco-sa-20190501-aci-filter-query,cisco-sa-20190501-aci-unmeasured-boot)).

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 108175†). The entry VDB-134333 is pretty similar. 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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