full-disclosure - ZDI-11-246: Sybase Adaptive Server Backup and Monitor Server NULL Write Remote Code Execution Vulnerability

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Message-ID: <AF6E290B52139041BD6CA591212E455B5766B94213@GVW0442EXB.americas.hpqcorp.net>
Date: Fri, 29 Jul 2011 19:34:02 +0100
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>, 
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Subject: ZDI-11-246: Sybase Adaptive Server Backup and
 Monitor Server NULL Write Remote Code Execution Vulnerability

ZDI-11-246: Sybase Adaptive Server Backup and Monitor Server NULL Write Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-246

July 29, 2011

-- CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

-- Affected Vendors:
Sybase

-- Affected Products:
Sybase Adaptive Server

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11463. 
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 Sybase Adaptive Server. Authentication is
not required to exploit this vulnerability. 

The specific flaw exists within the way Sybase Backup and Monitor
servers handles certain data in the login packets. Malformed packets can
cause the service in question to write a NULL byte on the stack which
can be leveraged by a remote attacker to execute code under the context
of the running service.

-- Vendor Response:
Sybase has issued an update to correct this vulnerability. More
details can be found at:
http://www.sybase.com/detail?id=1094235

-- Disclosure Timeline:
2011-02-02 - Vulnerability reported to vendor
2011-07-29 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Luigi Auriemma

-- 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:

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