bugtraq - ZDI-12-008 : Citrix Provisioning Services streamprocess.exe vDisk Name Parsing Remote Code Execution Vulnerability

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Date: Tue, 10 Jan 2012 11:58:52 -0600
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: ZDI-12-008 : Citrix Provisioning Services streamprocess.exe vDisk
 Name Parsing Remote Code Execution Vulnerability

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ZDI-12-008 : Citrix Provisioning Services streamprocess.exe vDisk Name
Parsing Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-008
January 10, 2012

- -- CVE ID:

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

- -- Affected Vendors:

Citrix

- -- Affected Products:

Citrix Provisioning Services

- -- 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 for UDP traffic on multiple ports, beginning with 6905. When
handling a packet which requests a vDisk name, the user-supplied
length value is not properly validated. 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/CTX130846

- -- Disclosure Timeline:
2011-04-01 - Vulnerability reported to vendor

2012-01-10 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:

* AbdulAziz Hariri of ThirdEyeTesters

- -- 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/

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    http://twitter.com/thezdi
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