ZDI-08-002: Citrix Presentation Server IMA Service Heap Overflow Vulnerability Jan 17 2008 11:40PM
zdi-disclosures 3com com
ZDI-08-002: Citrix Presentation Server IMA Service Heap Overflow



January 17, 2008

-- Affected Vendor:


-- Affected Products:

Metaframe Presentation Server 3.0

Presentation Server 4.0, 4.5

Access Essentials 1.0, 1.5, 2.0

Desktop Server 1.0

-- TippingPoint(TM) IPS Customer Protection:

TippingPoint IPS customers have been protected against this

vulnerability by Digital Vaccine protection filter ID 5469.

For further product information on the TippingPoint IPS:


-- Vulnerability Details:

This vulnerability allows attackers to execute arbitrary code on

vulnerable installations of Citrix Presentation Server. Authentication

is not required to exploit this vulnerability.

The specific flaw resides in the Independent Management Architecture

service, ImaSrv.exe, which listens by default on TCP port 2512 or 2513.

The process trusts a user-suppled value as a parameter to a memory

allocation. By supplying a specific value, an undersized heap buffer

may be allocated. Subsequently, an attacker can then overflow that heap

buffer by sending an overly large packet leading to arbitrary code

execution in the context of the SYSTEM user.

-- Vendor Response:

Citrix has issued an update to correct this vulnerability. More details

can be found at:


-- Disclosure Timeline:

2007.07.20 - Vulnerability reported to vendor

2008.01.17 - Coordinated public release of advisory

-- Credit:

This vulnerability was discovered by Eric DETOISIEN.

-- 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:


The ZDI is unique in how the acquired vulnerability information is used.

3Com does not re-sell the vulnerability details or any exploit code.

Instead, upon notifying the affected product vendor, 3Com 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, 3Com provides this vulnerability

information confidentially to security vendors (including competitors)

who have a vulnerability protection or mitigation product.

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