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ZDI-11-023: Citrix Provisioning Services streamprocess.exe Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Thu, 20 Jan 2011 12:34:43 -0600

ZDI-11-023: Citrix Provisioning Services streamprocess.exe Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-023

January 20, 2011

-- CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

-- Affected Vendors:
Citrix

-- Affected Products:
Citrix Citrix Provisioning Services

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10781.
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Citrix Provisioning Services. Authentication
is not required to exploit this vulnerability.

The specific flaw exists within the streamprocess.exe component which
listens by default on UDP port 6095. When handling a packet of type
0x40020010 the process blindly copies user supplied data into a fixed
length buffer on the stack. A remote attacker can exploit this
vulnerability to execute arbitrary code under the context of the SYSTEM
user.

-- Vendor Response:
Citrix has issued an update to correct this vulnerability. More
details can be found at:

http://support.citrix.com/article/CTX127149

-- Disclosure Timeline:
2010-06-09 - Vulnerability reported to vendor
2011-01-20 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * AbdulAziz Hariri

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

    http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

    http://twitter.com/thezdi



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