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Zero Day Initiative Advisory 08-041

Zero Day Initiative Advisory 08-041
Posted Jul 10, 2008
Authored by Tipping Point, Sebastian Apelt | Site zerodayinitiative.com

A 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.

tags | advisory, remote, overflow, arbitrary, tcp
SHA-256 | b8fab3a9c1fe5bdfe8b5490324976c46300330796237327dfa591f6ec5ca1bcb

Zero Day Initiative Advisory 08-041

Change Mirror Download
ZDI-08-041: Novell eDirectory dhost Integer Overflow Code Execution 
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-08-041
July 10, 2008

-- Affected Vendors:
Novell

-- Affected Products:
Novell eDirectory

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 5946.
For further product information on the TippingPoint IPS, visit:

http://www.tippingpoint.com

-- 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:

http://www.novell.com/support/search.do?cmd=displayKC&sliceId=SAL_Public&externalId=3694858

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

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

-- 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:

http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
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.

Our vulnerability disclosure policy is available online at:

http://www.zerodayinitiative.com/advisories/disclosure_policy/

CONFIDENTIALITY NOTICE: This e-mail message, including any attachments,
is being sent by 3Com for the sole use of the intended recipient(s) and
may contain confidential, proprietary and/or privileged information.
Any unauthorized review, use, disclosure and/or distribution by any
recipient is prohibited. If you are not the intended recipient, please
delete and/or destroy all copies of this message regardless of form and
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