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Cisco Nexus Operating System Devices Command Line Interface Local Privilege Escalation Vulnerability

Cisco-SA-20150701-CVE-2015-4237 · Medium · Published · Updated

A vulnerability in the Command Line Interface (CLI) parser of Cisco Nexus Operating System (NX-OS) devices could allow an authenticated, local attacker to perform a privilege escalation.   The vulnerability is due to improper input validation of special characters within filenames. An attacker could exploit this vulnerability by authenticating at the local shell and writing a file to disk with certain special characters. The attacker could then use that file with other CLI commands to obtain a shell prompt at their current privilege level. An exploit could allow the attacker to read and write files and perform other privileged commands. Cisco has confirmed the vulnerability; however, software updates are not available. To exploit this vulnerability, an attacker must have local access and be able to authenticate to the targeted device. These requirements could limit the possibility of a successful exploit. Cisco would like to thank Jens Krabbenhoeft for discovering and reporting this vulnerability.

Cisco advisory ·CSAF JSON

Workarounds

Administrators are advised to contact the vendor regarding future updates and releases.

Administrators are advised to allow only trusted users to access local systems.

Administrators are advised to allow only privileged users to access administration or management systems.

Administrators are advised to monitor affected systems.

CVEsCVE-2015-4237
Cisco Bug IDsCSCuu99291, CSCuv08434, CSCuv08436, CSCuv08443, CSCuv08448, CSCuv08480, CSCuv08491
CVSS ScoreBase 4.3
Base 4.3 AV:L/AC:L/Au:S/C:P/I:P/A:P/E:F/RL:U/RC:C
Product Names From Source
Cisco Nexus 1000V Switch, Cisco NX-OS Software 4.1(2)E1(1), Cisco NX-OS Software 6.2(12), Cisco NX-OS Software 7.2(0)ZZ(99.1), Cisco NX-OS Software

CSAF Product Statuses

Product Status Source CVE Rows
4.1(2)E1(1) known_affected cisco_csaf CVE-2015-4237 1
6.2(12) known_affected cisco_csaf CVE-2015-4237 1
7.2(0)ZZ(99.1) known_affected cisco_csaf CVE-2015-4237 1
Cisco Nexus 1000V Switch known_affected cisco_csaf CVE-2015-4237 1

Related Products

Product CVE Evidence
Cisco Nexus 1000V Switch CVE-2015-4237 Cisco OpenVuln
Cisco NX-OS Software CVE-2015-4237 Cisco OpenVuln
Cisco Nexus 1000V for KVM and Microsoft Hyper-V CVE-2015-4237 Cisco OpenVuln