Vulnerability in Cisco Nx-Os
CVE-2017-12340
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.
EPSS: 0.003 (26.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Cisco Nx-os — versions 8.1\(0.70\)s0
- N/a Cisco Multilayer Director, Nexus 7000 Series, And 7700 Series Switches — versions Cisco Multilayer Director, Nexus 7000 Series, and Nexus 7700 Series Switches
Weakness classification (CWE)
References
- psirt@cisco.com (vdb-entry, x_refsource_BID)
- psirt@cisco.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2017-12340?
- CVE-2017-12340 is a medium-severity vulnerability in Cisco Nx-Os, classified under Improper Access Control. CVSS score: 4.2/10. Published 2017-11-30.
- How severe is CVE-2017-12340?
- Medium severity. CVSS v3 base score is 4.2 out of 10.