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TITLE:
Citrix Products ActiveSync Service Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA38748

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/38748/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=38748

RELEASE DATE:
2011-03-26

DISCUSS ADVISORY:
http://secunia.com/advisories/38748/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/38748/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=38748

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
AbdulAziz Hariri has discovered a vulnerability in various Citrix
products, which can be exploited by malicious people to cause a DoS
(Denial of Service).

The vulnerability is caused due to an input validation error in the
processing of packets sent to the Citrix ActiveSync Service
(ctxactivesync.exe) and can be exploited to cause the service to
crash.

The vulnerability is reported in the following products (confirmed in
XenApp 5.0 ctxactivesync.exe 4.5.4200.1):
* Citrix XenApp 5
* Citrix Presentation Server 4.5
* Citrix Access Essentials 2.0

SOLUTION:
Apply hotfix (please see the vendor's advisory for details).

PROVIDED AND/OR DISCOVERED BY:
AbdulAziz Hariri via Secunia

ORIGINAL ADVISORY:
Citrix:
http://support.citrix.com/article/CTX128366

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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