Cisco NX-OS on Nexus 9000 Trusted Platform information disclosure

Summaryinfo

A vulnerability has been found in Cisco NX-OS on Nexus 9000 and classified as problematic. Affected by this issue is some unknown functionality of the component Trusted Platform Module. The manipulation leads to information disclosure. This vulnerability is listed as CVE-2019-1589. It is possible to launch the attack on the physical device. There is no available exploit.

Detailsinfo

A vulnerability was found in Cisco NX-OS on Nexus 9000 (Router Operating System) (the affected version unknown). It has been rated as problematic. This issue affects an unknown part of the component Trusted Platform Module. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

A vulnerability in the Trusted Platform Module (TPM) functionality of software for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, local attacker with physical access to view sensitive information on an affected device. The vulnerability is due to a lack of proper data-protection mechanisms for disk encryption keys that are used within the partitions on an affected device hard drive. An attacker could exploit this vulnerability by obtaining physical access to the affected device to view certain cleartext keys. A successful exploit could allow the attacker to execute a custom boot process or conduct further attacks on an affected device.

The bug was discovered 05/01/2019. The weakness was presented 05/03/2019 as cisco-sa-20190501-aci-unmeasur as confirmed advisory (Website). The advisory is shared at tools.cisco.com. The identification of this vulnerability is CVE-2019-1589 since 12/06/2018. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

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 $0-$5k. 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†). See VDB-134332 for similar entry. If you want to get the best quality for vulnerability data then you always have to consider 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 the best quality for vulnerability data then you always have to consider VulDB.

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