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

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