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Vulnerability Alert

Cisco Unified Communications Manager Privilege Escalation Vulnerability

 
Threat Type:CWE-264: Permissions, Privileges, and Access Control
IntelliShield ID:30042
Version:1
First Published:2013 July 17 16:17 GMT
Last Published:2013 July 17 16:17 GMT
Port: Not available
CVE:CVE-2013-3403
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.5
Related Resources:
View related Security Advisory
 
 
Version Summary:Cisco Unified Communications Manager contains a vulnerability that could allow an authenticated, local attacker to elevate privileges on a targeted device. Updates are available.
 
 
Description
A vulnerability in Cisco Unified Communications Manager (Unified CM) could allow an authenticated, local attacker to elevate privileges on the system.

The vulnerability is due to improper file permissions, environment variables, and relative paths in a privileged system script. An attacker could exploit this vulnerability by modifying a system script, which could allow the attacker to gain complete control of the affected system.

Proof-of-concept code that demonstrates an exploit of this vulnerability is publicly available.

Cisco has confirmed the vulnerability in a security advisory and has released a temporary fix.
 
Warning Indicators
Cisco Unified CM versions 9.1(1a) and prior are vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker requires authenticated access to the targeted system. Authenticated access may require the attacker to access trusted, internal networks. These access requirements could limit the likelihood of a successful exploit.

Cisco Unified CM version 8.0 reached the End of Software Maintenance on October 23, 2012. Customers using Cisco Unified CM 8.0(x) versions should contact their Cisco support team for assistance in upgrading to a supported version of Cisco Unified CM.

Cisco UCM is the only product confirmed to be vulnerable.  Additional voice products may be affected by one or more of the individual vulnerabilities that are described in the advisory. The following products are being investigated but have not yet been confirmed as vulnerable:
  • Cisco Emergency Responder
  • Cisco Unified Contact Center Express
  • Cisco Unified Customer Voice Portal
  • Cisco Unified Presence Server/Cisco IM and Presence Service
  • Cisco Unity Connection
 
Vendor Announcements
Cisco has released a security advisory for bug IDs CSCuh73454 and CSCuh87042 at the following link: cisco-sa-20130717-cucm
 
Impact
An authenticated, local attacker could exploit this vulnerability to completely compromise the targeted device.
 
Technical Information
The vulnerability is due to improper file permissions, environment variables, and relative paths in a privileged system script used by the affected software.

An authenticated, local attacker could exploit this vulnerability by modifying a privileged system script, which executes with elevated privileges, and inserting crafted commands. When the affected software executes the malicious commands, the attacker could completely compromise the targeted device.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: Identifying and Mitigating Exploitation of the Multiple Vulnerabilities in Cisco Unified Communications Manager

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.

A Cisco Options Package (COP) file, cmterm-CSCuh01051-2.cop.sgn, has been released to the software downloads page in the Utilities section for the affected software. The COP file for 9.1(x) versions would be located by navigating the following path on the software downloads page:

Products > Voice and Unified Communications > IP Telephony > Unified Communications Platform > Cisco Unified Communications manager > Cisco Unified Communications Manager Version 9.1 > Unified Communications Manager/CallManager/Cisco Unity Connection Utilities-COP-Files
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco Unified Communications Manager 7.1 (3), (5), (5b)

Associated Products:
N/A




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