CVE-2017-12336: Input Validation
First published: Thu Nov 30 2017(Updated: )
A vulnerability in the TCL scripting subsystem of Cisco NX-OS System Software could allow an authenticated, local attacker to escape the interactive TCL shell and gain unauthorized access to the underlying operating system of the device. The vulnerability exists due to insufficient input validation of user-supplied files passed to the interactive TCL shell of the affected device. An attacker could exploit this vulnerability to escape the scripting sandbox and execute arbitrary commands on the underlying operating system with the privileges of the authenticated user. To exploit this vulnerability, an attacker must have local access and be authenticated to the targeted device with administrative or tclsh execution privileges. This vulnerability affects the following products running Cisco NX-OS System Software: Multilayer Director Switches, Nexus 2000 Series Fabric Extenders, Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 5000 Series Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Switches in standalone NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules, Unified Computing System Manager. Cisco Bug IDs: CSCve93750, CSCve93762, CSCve93763, CSCvg04127.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Nx-os | =6.0\(2\)a8\(3\) | |
| Cisco Nx-os | =8.0\(1\) | |
| Cisco Nx-os | =8.1\(0\)bd\(0.20\) | |
| Cisco Nx-os | =8.1\(0.2\)s0 | |
| Cisco Nx-os | =8.1\(0.59\)s0 | |
| Cisco Nx-os | =8.1\(1\)s5 | |
| Cisco Unified Computing System | =7.0\(0\)hsk\(0.357\) |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is CVE-2017-12336?
CVE-2017-12336 is a vulnerability in the TCL scripting subsystem of Cisco NX-OS System Software that allows an authenticated, local attacker to gain unauthorized access to the underlying operating system of the device.
How does CVE-2017-12336 impact Cisco NX-OS System Software?
CVE-2017-12336 impacts Cisco NX-OS System Software by allowing an attacker to escape the interactive TCL shell and gain unauthorized access to the underlying operating system.
What is the severity of CVE-2017-12336?
The severity of CVE-2017-12336 is medium with a CVSS score of 4.2.
Which versions of Cisco NX-OS System Software are affected by CVE-2017-12336?
Cisco NX-OS System Software versions 6.0(2)a8(3), 8.0(1), 8.1(0)bd(0.20), 8.1(0.2)s0, 8.1(0.59)s0, 8.1(1)s5, and Cisco Unified Computing System version 7.0(0)hsk(0.357) are affected by CVE-2017-12336.
How can I mitigate CVE-2017-12336?
To mitigate CVE-2017-12336, Cisco recommends upgrading to a fixed software version.
- collector/nvd-index
- agent/references
- agent/event
- agent/weakness
- agent/severity
- agent/author
- agent/description
- agent/type
- agent/softwarecombine
- agent/last-modified-date
- agent/first-publish-date
- agent/tags
- collector/mitre-cve
- source/MITRE
- vendor/cisco
- canonical/cisco nx-os
- version/cisco nx-os/6.0\(2\)a8\(3\)
- version/cisco nx-os/8.0\(1\)
- version/cisco nx-os/8.1\(0\)bd\(0.20\)
- version/cisco nx-os/8.1\(0.2\)s0
- version/cisco nx-os/8.1\(0.59\)s0
- version/cisco nx-os/8.1\(1\)s5
- canonical/cisco unified computing system
- version/cisco unified computing system/7.0\(0\)hsk\(0.357\)