ZDI-11-245: Sybase Adaptive Server Backup and Monitor Server Translation Array Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-245

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 Enterprise.
Authentication is not required to exploit this vulnerability.

The specific flaw exists within the way Sybase Backup and Monitor
servers handle certain data in the login packets. Malformed packets can
cause the service in question to lookup a function pointer outside a
predefined function pointer array. It is possible to set this function
pointer to an address where user controlled data exists and this will
result in code execution under the rights of the user running the
Monitor Server.

-- 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:
2011-01-21 - Vulnerability reported to vendor
2011-07-29 - Coordinated public release of advisory

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

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