Privilege escalation in Cisco Systems, Inc products - CVE-2017-12336

Vulnerability identifier: #VU9483

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2017-12336

CWE-ID: CWE-77

Exploitation vector: Local access

Exploit availability: No public exploit available

Vendor: Cisco Systems, Inc

Affected software:
Nexus 9500 R-Series Line Cards and Fabric Modules
Nexus 7700 Series Switches
Nexus 7000 Series Switches
Nexus 6000 Series Switches
Nexus 5600 Platform Switches
Nexus 5500 Platform Switches
Nexus 5000 Series Switches
Nexus 2000 Series Fabric Extenders
Multilayer Director Switches
Nexus 3500 Series Switches

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists in the TCL scripting subsystem of Cisco NX-OS System Software due to insufficient input validation of user-supplied files passed to the interactive TCL shell. A local attacker with administrative or tclsh execution privileges can escape the interactive TCL shell, gain unauthorized access to the underlying operating system and execute arbitrary commands with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Install update from vendor's website.

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171129-nxos5