ZDI-08-066: Novell eDirectory Core Protocol Opcode 0x24 Heap Overflow Vulnerability Oct 08 2008 09:33PM
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ZDI-08-066: Novell eDirectory Core Protocol Opcode 0x24 Heap Overflow



October 8, 2008

-- CVE ID:


-- Affected Vendors:


-- Affected Products:

Novell eDirectory

-- TippingPoint(TM) IPS Customer Protection:

TippingPoint IPS customers have been protected against this

vulnerability by Digital Vaccine protection filter ID 6177.

For further product information on the TippingPoint IPS, visit:


-- Vulnerability Details:

This vulnerability allows remote attackers to execute arbitrary code on

vulnerable installations of Novell eDirectory Server. Authentication is

not required to exploit this vulnerability.

The specific flaw exists within dhost.exe, the service responsible for

directory replication which is bound by default to TCP port 524.

Improper parsing within opcode 0x24 via the Netware Core Protocol can

result in an arithmetic calculation based on supplied user-input

resulting in an under-allocated heap buffer. This fault can be leveraged

to result in arbitrary code execution.

-- Vendor Response:

Novell has issued an update to correct this vulnerability. More

details can be found at:


-- Disclosure Timeline:

2008-05-19 - Vulnerability reported to vendor

2008-10-08 - Coordinated public release of advisory

-- Credit:

This vulnerability was discovered by:

* Sebastian Apelt (webmaster (at) buzzworld (dot) org [email concealed])

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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.

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