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Vulnerability Alert

Cisco AsyncOS Software SLBL Code Execution Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:33309
Version:1
First Published:2014 March 19 16:14 GMT
Last Published:2014 March 19 16:14 GMT
Port: Not available
CVE:CVE-2014-2119
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:8.5 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.0
Related Resources:
View related Security AdvisoryView related IPS Signature
 
 
Version Summary:Cisco AsyncOS Software for Cisco Email Security Appliance and Cisco Content Security Management Appliance contains a vulnerability that could allow an authenticated, remote attacker to execute arbitrary code. Updates are available.
 
 
Description
A vulnerability in the End User Safelist/Blocklist (SLBL) function of Cisco AsyncOS Software for Cisco Email Security Appliance and Cisco Content Security Management Appliance could allow an authenticated, remote attacker to execute arbitrary code on an affected system.

The vulnerability is due to insufficient validation of the SLBL database file. An attacker could exploit this vulnerability by substituting a valid SLBL database file with a tampered file. The tampered file could contain shell code that would be executed by the affected system when a specific event is triggered (for example, when a new email is received that triggers the SLBL check). To exploit this vulnerability, the attacker must have the FTP and SLBL services enabled, at least temporarily, and have valid credentials to upload the tampered SLBL database file via FTP.

An exploit could allow the attacker to execute arbitrary code on the affected system with the privileges of the root user.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco AsyncOS Software running on the following Cisco products are affected:
  • Cisco Email Security Appliance versions prior to 8.0.1-023
  • Cisco Content Security Management Appliance  versions prior to 8.1.1-013
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must authenticate to a targeted device. This access requirement reduces the likelihood of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug IDs CSCug79377 and CSCug80118 at the following link: cisco-sa-20140319-asyncos
 
Impact
An authenticated, remote attacker could exploit this vulnerability to execute arbitrary code with root-level privileges. A successful exploit could result in a complete system compromise.
 
Technical Information
The vulnerability is due to insufficient validation of the SLBL database file by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by substituting a valid SLBL database file with a malicious SLBL file containing shell code. After the affected system triggers a specific event, the attacker could execute the shell code from the malicious SLBL file with the privileges of the root user, which could result in a complete system compromise.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

Once a valid SLBL file has been loaded on a system, administrators may consider disabling the FTP and SLBL services to reduce the exposure of this vulnerability by preventing the replacement of the valid SLBL file with a malicious SLBL file.

Administrators are advised to monitor critical systems.
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. 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.

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
3889/0Cisco AsyncOS Software Code ExecutionS7782014 Mar 19 
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco Email Security Appliance (ESA) 7.1 .0, .1, .2, .3, .4, .5 | 7.3 .0, .1, .2 | 7.5 .0, .1, .2 | 7.6 .0, .1, .2 | 7.8 Base | 8.0 Base
CiscoCisco Content Security Management Appliance (SMA) 7.2 .0, .1, .2 | 7.7 .0, .1 | 7.8 Base | 8.0 .0 | 8.1 .0

Associated Products:
N/A




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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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