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

July 29th, 2011
ZDI-11-246 ZDI-CAN-1069

CVE ID

CVSS Score

10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected Vendors

Sybase

Affected Products

Adaptive Server

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.

Additional Details

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

Luigi Auriemma

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