cisco-sa-20190515-nxos-psvb: Cisco NX-OS Software Patch Signature Verification Bypass Vulnerability
First published: Wed May 15 2019(Updated: )
A vulnerability in the Image Signature Verification feature of Cisco NX-OS Software could allow an authenticated, local attacker with administrator-level credentials to install a malicious software patch on an affected device. The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by crafting an unsigned software patch to bypass signature checks and loading it on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco NX-OS Software | =8.1<8.1(1a)=7.3<8.1(1a) | 8.1(1a) 8.1(1a) |
| Cisco NX-OS Software | ||
| Cisco NX-OS Software | =3.2<3.2(3k)=3.1<3.2(3k) | 3.2(3k) 3.2(3k) |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for the Cisco NX-OS Software Patch Signature Verification Bypass vulnerability?
The vulnerability ID for the Cisco NX-OS Software Patch Signature Verification Bypass vulnerability is cisco-sa-20190515-nxos-psvb.
What is the severity of the Cisco NX-OS Software Patch Signature Verification Bypass vulnerability?
The severity of the Cisco NX-OS Software Patch Signature Verification Bypass vulnerability is medium with a CVSS score of 6.4.
How does the Cisco NX-OS Software Patch Signature Verification Bypass vulnerability allow an attacker to install a malicious software patch?
The Cisco NX-OS Software Patch Signature Verification Bypass vulnerability allows an authenticated, local attacker with administrator-level credentials to install a malicious software patch on an affected device.
Which versions of Cisco NX-OS Software are affected by the Patch Signature Verification Bypass vulnerability?
The following versions of Cisco NX-OS Software are affected by the Patch Signature Verification Bypass vulnerability: 8.1(1a), 7.3, and 3.2(3k).
Is there a remedy available for the Cisco NX-OS Software Patch Signature Verification Bypass vulnerability?
No, there is currently no available remedy for the Cisco NX-OS Software Patch Signature Verification Bypass vulnerability.
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- version/cisco nx-os software/3.1