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

2011-08-03T00:00:00
ID SECURITYVULNS:DOC:26772
Type securityvulns
Reporter Securityvulns
Modified 2011-08-03T00:00:00

Description

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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