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AUSCERT External Security Bulletin Redistribution
Cisco Nexus Devices Python Subsystem Local Privilege
1 July 2015
AusCERT Security Bulletin Summary
Product: Cisco NX-OS Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
CVE Names: CVE-2015-4234
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Cisco Nexus Devices Python Subsystem Local Privilege Escalation
Threat Type: CWE-264: Permissions, Privileges, and Access Control
IntelliShield ID: 39571
First Published: 2015 June 30 22:03 GMT
Last Published: 2015 June 30 22:03 GMT
Port: Not available
Urgency: Unlikely Use
Severity: Mild Damage
CVSS Base: 6.8
CVSS Version 2.0
CVSS Temporal: 6.5
Version Summary: Cisco Nexus devices contain multiple vulnerabilities that
could allow an authenticated, local attacker to gain elevated privileges on a
targeted system. Updates are not available.
Multiple privilege escalation vulnerabilities in the Python subsystem of Cisco
Nexus devices running Cisco NX-OS Software could allow an authenticated, local
attacker to gain elevated privileges.
The vulnerabilities are due to insufficient hardening of the operating system
on which NX-OS is based. An attacker who has sufficient privileges to execute
arbitrary Python scripts on an affected device could use this access to obtain
Cisco has confirmed the vulnerability; however, software updates are not
At the time this alert was first published, Cisco Nexus devices running Cisco
NX-OS Software releases 6.0(2) and 6.2(2) were vulnerable. Later releases of
Cisco NX-OS Software may also be vulnerable.
To exploit these vulnerabilities, an attacker must have local access and
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
Cisco has released bug IDs CSCun02887, CSCur00115, and CSCur00127 for
registered users, which contains additional details and an up-to-date list of
affected product versions.
An authenticated, local attacker could exploit these vulnerabilities to gain
root privileges on an affected device. A successful exploit could result in a
complete system compromise.
The vulnerabilities are due to insufficient hardening of the underlying
operating system on a Cisco Nexus device running an affected version of Cisco
An authenticated, local attacker who has sufficient privileges to execute
arbitrary Python scripts on a targeted device could use this access to obtain
root privileges. A successful exploit could result in a complete system
Administrators are advised to contact the vendor regarding future updates and
Administrators are advised to allow only trusted users to access local
Administrators are advised to allow only privileged users to access
administration or management systems.
Administrators are advised to monitor affected systems.
Software updates are not available.
The security vulnerability applies to the following combinations of products.
Cisco Cisco MDS 9000 NX-OS Software 6.2 (2) | 6.0 (2)
Cisco Cisco MDS SAN-OS Software 6.0 (2) | 6.2 (2)
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The urgency and severity ratings of this alert are not tailored to individual
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THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF
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TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES
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