high
7.8
CWE
264
Advisory Published
Updated

CVE-2019-1593: Cisco NX-OS Software Bash Shell Role-Based Access Control Bypass Privilege Escalation Vulnerability

First published: Wed Mar 06 2019(Updated: )

A vulnerability in the Bash shell implementation for Cisco NX-OS Software could allow an authenticated, local attacker to escalate their privilege level by executing commands authorized to other user roles. The attacker must authenticate with valid user credentials. The vulnerability is due to the incorrect implementation of a Bash shell command that allows role-based access control (RBAC) to be bypassed. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the Bash prompt. A successful exploit could allow the attacker to escalate their privilege level by executing commands that should be restricted to other roles. For example, a dev-ops user could escalate their privilege level to admin with a successful exploit of this vulnerability.

Credit: ykramarz@cisco.com ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Nx-os>=7.0\(3\)i5<7.0\(3\)i7\(4\)
Cisco Nexus 3000
Cisco Nx-os>=7.0\(3\)i4<7.0\(3\)i4\(9\)
Cisco Nx-os>=7.0\(3\)<7.0\(3\)i7\(4\)
Cisco Nexus 3500
Cisco Nx-os>=7.0\(3\)<7.0\(3\)f3\(5\)
Cisco Nexus 3600
Cisco Nx-os>=8.1<8.2\(3\)
Cisco Nx-os>=8.3<8.3\(1\)
Cisco Nexus 7000
Cisco Nexus 7700
Cisco Nx-os<13.2\(4d\)
Cisco Nx-os>=14.0<14.0\(1h\)
Cisco Nexus 9000 In Aci Mode
Cisco Nexus 9000 In Standalone
Cisco Nexus 9500
All of
Cisco Nx-os>=7.0\(3\)i5<7.0\(3\)i7\(4\)
Cisco Nexus 3000
All of
Cisco Nx-os>=7.0\(3\)i4<7.0\(3\)i4\(9\)
Cisco Nexus 3000
All of
Cisco Nx-os>=7.0\(3\)<7.0\(3\)i7\(4\)
Cisco Nexus 3500
All of
Cisco Nx-os>=7.0\(3\)<7.0\(3\)f3\(5\)
Cisco Nexus 3600
All of
Any of
Cisco Nx-os>=8.1<8.2\(3\)
Cisco Nx-os>=8.3<8.3\(1\)
Any of
Cisco Nexus 7000
Cisco Nexus 7700
All of
Any of
Cisco Nx-os<13.2\(4d\)
Cisco Nx-os>=14.0<14.0\(1h\)
Cisco Nexus 9000 In Aci Mode
All of
Any of
Cisco Nx-os>=7.0\(3\)i4<7.0\(3\)i4\(9\)
Cisco Nx-os>=7.0\(3\)i5<7.0\(3\)i7\(4\)
Cisco Nexus 9000 In Standalone
All of
Cisco Nx-os>=7.0\(3\)<7.0\(3\)f3\(5\)
Cisco Nexus 9500

Remedy

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-bash-escal

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Reference Links

Frequently Asked Questions

  • What is CVE-2019-1593?

    CVE-2019-1593 is a vulnerability in the Bash shell implementation for Cisco NX-OS Software that allows an authenticated, local attacker to escalate their privilege level.

  • How does CVE-2019-1593 affect Cisco NX-OS Software?

    CVE-2019-1593 affects Cisco NX-OS Software versions 7.0(3)i5 to 7.0(3)i7(4) and versions 7.0(3)i4 to 7.0(3)i4(9).

  • What is the severity of CVE-2019-1593?

    The severity of CVE-2019-1593 is high, with a severity value of 7.8.

  • How can I fix CVE-2019-1593?

    To fix CVE-2019-1593, Cisco recommends upgrading Cisco NX-OS Software to a fixed version.

  • Where can I find more information about CVE-2019-1593?

    You can find more information about CVE-2019-1593 on the SecurityFocus website and the Cisco Security Advisory.

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