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Citrix Provisioning Services SoapServer Heap Buffer Overflow

01.05.12

BACKGROUND

Citrix Provisioning Services is a streaming service to deliver a desktop image on-demand to physical desktops from a network service. The shared desktop image is configured, delivered, and managed centrally. Part of the Citrix Provisioning Services includes a SoapServer service.

DESCRIPTION

Remote exploitation of a heap buffer overflow vulnerability in Citrix Systems Inc.'s Provisioning Services software could allow an attacker to execute arbitrary code with the privileges of the affected service.

The SoapServer service contains a vulnerability that can be triggered by an unauthenticated attacker. The SoapServer service allocates a fixed sized heap buffer for a date and time string. A buffer index pointer calculation may result in a pointer value which references a location outside the fixed sized heap buffer. This condition may result in a heap buffer overflow and can lead to arbitrary code execution.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the affected service. To exploit this vulnerability, an attacker must be able to create a TCP connection to the SoapServer service on the targeted server. No authentication is required.

DETECTION

Citrix Provisioning Services versions 5.0, 5.1, 5.6, 5.6 SP1, 6.0 and 6.1 are vulnerable.

WORKAROUND

iDefense is currently unaware of any workaround for this issue.

VENDOR RESPONSE

Citrix has released hotfixes to address this vulnerability. For more information, consult their advisory at the following URL.

http://support.citrix.com/article/CTX133039

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

10/12/2011 Initial Vendor Notification
10/13/2011 Initial Vendor Reply
05/01/2012 Coordinated Public Disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2012 Verisign, Inc.

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