TippingPoint Zero Day Initiative

Sybase Adaptive Server Backup and Monitor Server NULL Write Remote Code Execution Vulnerability

ZDI-11-246: July 29th, 2011

CVSS Score

Affected Vendors


Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11463. For further product information on the TippingPoint IPS:

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:

Disclosure Timeline

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


This vulnerability was discovered by:
    Luigi Auriemma