[NT] Centennial Software XFERWAN Stack Overflow Vulnerability



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Centennial Software XFERWAN Stack Overflow Vulnerability
------------------------------------------------------------------------


SUMMARY

A vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of software utilizing the Centennial Software
XFERWAN component. Authentication is not required to exploit this
vulnerability.

DETAILS

Vulnerable Systems:
* Symantec Discovery 6.5

The specific flaw exists during the parsing of overly long requests to the
XFERWAN component. When logging requests, user-supplied data is copied to
the stack resulting in an exploitable buffer overflow condition. The
following disassembly excerpt from the logging function demonstrates the
issue:

004047A0 mov cl, Filename[eax]
004047A6 mov [esp+eax+890h+ExistingFileName], cl
004047AD inc eax
004047AE test cl, cl
004047B0 jnz short loc_4047A0

A lack of sanity checking on the size of 'Filename' results in an
exploitable stack-based buffer overflow vulnerability that can result in a
system compromise running under the context of the SYSTEM user.

Vendor Status:
Centennial Software states "Centennial has rectified an issue in the
XFERWAN component of Centennial Discovery which could be remotely
exploited by malicious people to compromise a system. Customers can find
instructions on how to identify if they are susceptible to the
vulnerability and correct, if necessary on the Centennial Customer Support
website.".

Disclosure Timeline:
* 2007-03-07 - Vulnerability reported to vendor
* 2007-04-03 - Digital Vaccine released to TippingPoint customers
* 2007-06-04 - Coordinated public release of advisory


ADDITIONAL INFORMATION

The information has been provided by TPTI-07-10: TippingPoint Security
Research Team.
The original article can be found at:
<http://dvlabs.tippingpoint.com/advisory/TPTI-07-10>
http://dvlabs.tippingpoint.com/advisory/TPTI-07-10



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