medium
6.7
CWE
347
Advisory Published
Updated

CVE-2019-1809: 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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Nx-os>=7.3<8.1\(1a\)
Cisco Nx-os>=8.2<8.3\(1\)
Cisco Mds 9706
Cisco Mds 9710
Cisco Mds 9718
Cisco Nx-os>=7.2<7.3\(3\)d1\(1\)
Cisco Nx-os>=8.0<8.2\(3\)
Cisco 7000 10-slot
Cisco 7000 18-slot
Cisco 7000 4-slot
Cisco 7000 9-slot
Cisco 7700 10-slot
Cisco 7700 18-slot
Cisco 7700 2-slot
Cisco 7700 6-slot
Cisco N77-f312ck-26
Cisco N77-f324fq-25
Cisco N77-f348xp-23
Cisco N77-f430cq-36
Cisco N77-m312cq-26l
Cisco N77-m324fq-25l
Cisco N77-m348xp-23l
Cisco N7k-f248xp-25e
Cisco N7k-f306ck-25
Cisco N7k-f312fq-25
Cisco N7k-m202cf-22l
Cisco N7k-m206fq-23l
Cisco N7k-m224xp-23l
Cisco N7k-m324fq-25l
Cisco N7k-m348xp-25l
Cisco Nexus 7000 Supervisor 1
Cisco Nexus 7000 Supervisor 2
Cisco Nexus 7000 Supervisor 2e
Cisco Nexus 7700 Supervisor 2e
Cisco Nexus 7700 Supervisor 3e
Cisco Nx-os>=3.1<3.2\(3k\)
Cisco Ucs 6248up
Cisco Ucs 6296up
Cisco Ucs 6324
Cisco Ucs 6332
Cisco Ucs 6332-16up

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Reference Links

Frequently Asked Questions

  • What is CVE-2019-1809?

    CVE-2019-1809 is a vulnerability in the Image Signature Verification feature of Cisco NX-OS Software that could allow an authenticated, local attacker with administrator-level credentials to install a malicious software patch on an affected device.

  • Which software is affected by CVE-2019-1809?

    Cisco NX-OS Software versions 7.3 to 8.1(1a) and versions 8.2 to 8.3(1) are affected by CVE-2019-1809.

  • What is the severity of CVE-2019-1809?

    CVE-2019-1809 has a severity score of 6.7 (medium).

  • How can I fix CVE-2019-1809?

    It is recommended to upgrade to a fixed version of Cisco NX-OS Software.

  • Where can I find more information about CVE-2019-1809?

    You can find more information about CVE-2019-1809 on the Cisco Security Advisory website and the SecurityFocus website.

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