TippingPoint Zero Day Initiative

Novell eDirectory dhost.exe Accept Language Header Heap Overflow Vulnerability

ZDI-08-064: October 8th, 2008


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 6084. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows attackers to execute arbitrary code on vulnerable installations of Novell eDirectory. Authentication is not required to exploit this vulnerability.

The specific flaw resides in the web console running on TCP ports 8028 and 8030. The server exposes a web interface and accepts SOAP connections. The service copies the contents of the Accept-Language header within a SOAP request into a fixed-length buffer without any bounds checking. If an attacker sends a specially crafted request it will trigger an overflow during a memory copy operation leading to arbitrary code execution under the context of the SYSTEM user.

Vendor Response

Novell has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2008-04-08 - Vulnerability reported to vendor
    2008-10-08 - Coordinated public release of advisory


This vulnerability was discovered by: