TippingPoint Zero Day Initiative

Novell eDirectory dhost Integer Overflow Code Execution Vulnerability

ZDI-08-041: July 10th, 2008


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 5946. For further product information on the TippingPoint IPS:

Vulnerability Details

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

The specific flaw exists within dhost.exe, bound by default to TCP port 524. Flawed arithmetic applied to a user-supplied value results in an integer overflow and subsequently a complete stack smash allowing an attacker to execute arbitrary code via SEH redirection.

Vendor Response

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

Disclosure Timeline

    2007-12-04 - Vulnerability reported to vendor
    2008-07-10 - Coordinated public release of advisory


This vulnerability was discovered by:
    Sebastian Apelt (webmaster@buzzworld.org)