Vulnerability Alert

Apple Remote Desktop Username Format String Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-134: Format String Vulnerability
IntelliShield ID:31443
Version:2
First Published:2013 October 23 19:34 GMT
Last Published:2013 October 24 18:30 GMT
Port: Not available
CVE:CVE-2013-5135
BugTraq ID:63284
Urgency:Possible use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:10.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.4
 
Version Summary:IntelliShield has updated this alert to include additional information regarding the Apple Remote Desktop username format string arbitrary code execution vulnerability.
 
 
Description
A vulnerability in Apple Remote Desktop could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to insufficient sanitization of user-supplied input processed by the affected software. An unauthenticated, remote attacker could exploit the vulnerability by sending malicious requests to the targeted system. Processing the content could allow the attacker the ability to execute arbitrary code in the security context of the affected application.

Apple has confirmed the vulnerability and released software updates.
 
Warning Indicators
Apple Remote Desktop versions prior to 3.7 and prior to 3.5.4 are affected.
 
IntelliShield Analysis
The functionality of Apple Remote Desktop often demands that systems with the affected software be connected to untrusted, external networks so that users can connect to these systems remotely over the Internet. This exposure creates an increased risk of exploitation. In addition, because the vulnerability exists in the authentication mechanism of the software, attackers can exploit the vulnerability prior to authentication. These factors contribute to an easily exploited vulnerability, possibly very attractive to a wide variety of attackers. Although no exploitation has been reported, administrators are advised to take mitigating action immediately due to greater than average exposure.
 
Vendor Announcements
Apple has released security advisories at the following links: APPLE-SA-2013-10-22-6 and APPLE-SA-2013-10-22-7
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on the system with elevated privileges, possibly resulting in complete system compromise.
 
Technical Information
The vulnerability is due to a format string error when handling username parameters within authentication attempts processed by the affected software.

An unauthenticated, remote attacker could exploit the vulnerability by connecting to a vulnerable system and sending malicious input within the username parameter as part of an authenticated request to Apple Remote Desktop. The processing of the malicious input could allow the attacker to execute arbitrary code in the security context of the affected application.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators may consider disabling Apple Remote Desktop until updates can be applied.

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
Apple has released software updates at the following links:
 
Alert History
 

Version 1 October 23, 2013, 7:34 PM: Apple Remote Desktop contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code. Updates are available.

Initial Release


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

Primary Products:
AppleApple Remote Desktop 3.0 Base | 3.1 Base | 3.2 .0, .1, .2 | 3.5 Base, .1, .2, .3 | 3.6 Base, .1, .2

Associated Products:
N/A




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