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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.1755
        Cisco Nexus Operating System Devices Command Line Interface
                 Local Privilege Escalation Vulnerability
                                2 July 2015

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco NX-OS Software
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2015-4237  

Original Bulletin: 
   http://tools.cisco.com/security/center/viewAlert.x?alertId=39583

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Vulnerability Alert

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

Threat Type: CWE-264: Permissions, Privileges, and Access Control

IntelliShield ID: 39583

Version: 1

First Published: 2015 July 01 20:38 GMT

Last Published: 2015 July 01 20:38 GMT

Port: Not available

CVE: CVE-2015-4237

Urgency: Unlikely Use 

Credibility: Confirmed 

Severity: Mild Damage 

CVSS Base: 4.3 

CVSS Version 2.0

CVSS Temporal: 4.1

Version Summary: Cisco Nexus devices contain a vulnerability that could allow
an authenticated, local attacker to gain elevated privileges on a targeted 
system. Updates are not available.

Description

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.

Warning Indicators

At the time this alert was first published, Cisco Nexus devices running the 
following Cisco NX-OS Software releases were vulnerable:

Cisco NX-OS Software release 9.1(1)SV1(3.1.8)

Cisco NX-OS Software release 7.2(0)ZZ(99.1)

Cisco NX-OS Software release 7.2(0)ZZ(99.3)

Cisco NX-OS Software release 4.1(2)E1(1)

Cisco NX-OS Software release 6.2(12)

Cisco NX-OS Software release 6.2(11b)

Later releases of Cisco NX-OS Software may also be vulnerable.

IntelliShield Analysis

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.

Vendor Announcements

Cisco has released bug IDs CSCuv08491, CSCuv08443, CSCuv08480, CSCuv08448, 
CSCuu99291, CSCuv08434, and CSCuv08436 for registered users, which contains 
additional details and an up-to-date list of affected product versions.

Impact

An authenticated, local attacker could exploit this vulnerability to gain 
elevated privileges on an affected device. A successful exploit could be used
to conduct further attacks.

Technical Information

The vulnerability is due to insufficient validation of user input within 
filenames by an affected device.

An attacker could exploit this vulnerability by authenticating at the local 
shell on a targeted device and writing a file to disk with certain special 
characters. An exploit could allow the attacker to perform other privileged 
commands, which could be leveraged to conduct further attacks.

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 NX-OS Software for Nexus 3000 Series 7.2(0)ZZ(99.1) | for Nexus 
4000 Series 4.1(2)E1(1) | for Nexus 5000 Series 7.2(0)ZZ(99.1) | for Nexus 
7000 Series 6.2(12) | for Nexus 9000 Series 7.2(0)ZZ(99.3)

Cisco Cisco MDS 9000 NX-OS Software 6.2 (11b)

Cisco Cisco Nexus 1000V Switch 9.1(1)SV1(3.1.8) Base

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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