VULNERABILITY INTELLIGENCE

CVE-2017-12340

CVSS score4.2 MEDIUM
EPSS probability0.34%
CISA KEVNot currently listed
Published2017-11-30
Last modified2026-06-17
CVSS vectorCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L

Description

A vulnerability in Cisco NX-OS System Software running on Cisco MDS Multilayer Director Switches, Cisco Nexus 7000 Series Switches, and Cisco Nexus 7700 Series Switches could allow an authenticated, local attacker to access the Bash shell of an affected device's operating system, even if the Bash shell is disabled on the system. The vulnerability is due to insufficient sanitization of user-supplied parameters that are passed to certain functions of the Python scripting sandbox of the affected system. An attacker could exploit this vulnerability to escape the scripting sandbox and enter the Bash shell of the operating system with the privileges of the authenticated user for the affected system. To exploit this vulnerability, the attacker must have local access to the affected system and be authenticated to the affected system with administrative or Python execution privileges. Cisco Bug IDs: CSCvd86513.

Weakness classification

  • CWE-116: Improper Encoding or Escaping of Output
  • CWE-284: Improper Access Control

Primary references