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AUSCERT External Security Bulletin Redistribution
ESB-2015.1743
Cisco Nexus Devices Python Subsystem Local Privilege
Escalation Vulnerabilities
1 July 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco NX-OS Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2015-4234
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=39571
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Vulnerability Alert
Cisco Nexus Devices Python Subsystem Local Privilege Escalation
Vulnerabilities
Threat Type: CWE-264: Permissions, Privileges, and Access Control
IntelliShield ID: 39571
Version: 1
First Published: 2015 June 30 22:03 GMT
Last Published: 2015 June 30 22:03 GMT
Port: Not available
CVE: CVE-2015-4234
Urgency: Unlikely Use
Credibility: Confirmed
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.
Description
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
root privileges.
Cisco has confirmed the vulnerability; however, software updates are not
available.
Warning Indicators
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.
IntelliShield Analysis
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
vulnerability.
Vendor Announcements
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.
Impact
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.
Technical Information
The vulnerabilities are due to insufficient hardening of the underlying
operating system on a Cisco Nexus device running an affected version of Cisco
NX-OS Software.
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
compromise.
Safeguards
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.
Patches/Software
Software updates are not available.
Alert History
Initial Release
Product Sets
The security vulnerability applies to the following combinations of products.
Primary 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)
Associated Products:
N/A
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are
highlighted by analysts in the Cisco Threat Operations Center and represent a
subset of the comprehensive content that is available through Cisco Security
IntelliShield Alert Manager Service. This customizable threat and
vulnerability alert service provides security staff with access to timely,
accurate, and credible information about threats and vulnerabilities that may
affect their environment.
LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual
users; users may value alerts differently based upon their network
configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED
THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED
THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION
IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE
TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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