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. 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-20190306-nx-os-bash-escal This advisory is part of the March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 26 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.
Affected Software | Affected Version | How to fix |
---|---|---|
Cisco NX-OS | ||
Cisco NX-OS | =7.0(3)<7.0(3)F3(3c)1 | 7.0(3)F3(3c)1 |
Cisco NX-OS | =14.0<14.0(1h)=13.2<13.2(4d)=13.1<13.2(4d)=Prior to 13.1<13.2(4d) | 14.0(1h) 13.2(4d) 13.2(4d) 13.2(4d) |
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
The cisco-sa-20190306-nx-os-bash-escal vulnerability is classified as a privilege escalation issue.
To fix cisco-sa-20190306-nx-os-bash-escal, upgrade the NX-OS Software to the recommended versions provided in Cisco's advisory.
Authenticated local attackers with valid user credentials are affected by cisco-sa-20190306-nx-os-bash-escal.
The CVSS score for cisco-sa-20190306-nx-os-bash-escal reflects its potential impact on affected systems.
Cisco NX-OS Software versions prior to 14.0(1h) and specific builds of 7.0(3) are vulnerable to cisco-sa-20190306-nx-os-bash-escal.