EMC Autostart ftAgent Opcode 0x11 Parsing Remote Code Execution Vulnerability

August 23rd, 2011
ZDI-11-275 ZDI-CAN-1256

CVE ID

CVE-2011-2735

CVSS Score

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

Affected Vendors

EMC

Affected Products

AutoStart

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of EMC AutoStart. Authentication is not required to exploit this vulnerability.

The specific flaw exists in the Agent Service (ftAgent.exe). The Agent Service listens on TCP port 8045 for communications between AutoStart nodes. When handling messages with opcode 0x11 the process performs arithmetic on an unvalidated user-supplied value used to determine the size of a new heap buffer, allowing a potential integer wrap to cause a heap buffer overflow. Remote unauthenticated attackers can exploit this vulnerability by sending malformed message packets to the target, which can ultimately lead to arbitrary code execution under the context of the SYSTEM user.

Additional Details

EMC has issued an update to correct this vulnerability. More details can be found at:
http://www.securityfocus.com/archive/1/519371

Disclosure Timeline

  • 2011-07-20 - Vulnerability reported to vendor
  • 2011-08-23 - Coordinated public release of advisory

Credit

Sebastian Apelt (www.siberas.de)

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