Research > Zero-Day Tracker > 20070329
Brightstor Backup Mediasvr.exe RPC 191
A remote code execution vulnerability exists within Computer Associates BrightStor Backup Mediasvr.exe. Utilizing RPC function 191 (0xbf), an attacker is able to anonymously control registers in such a way that would allow for arbitrary code execution. This code is executed under the context of SYSTEM, allowing for full system compromise.
Arbitrary code execution as SYSTEM
This vulnerability can be exploited anonymously against BrightStor, allowing for a remote attacker to run arbitrary code under SYSTEM in order to obtain full system access.
Now that a patch is released, the best form of mitigation is to install the patch from Computer Associates.
Non-Patch Vendor Mitigation Suggestions
1) Rename the "mediasvr.exe" file to a non-functional file name, such as "mediasvc.exe.disable".
2) Restart the CA BrightStor Tape Engine service.
NOTE: This disables command line functionality within BrightStor.
eEye's Blink® Personal Edition protects from this vulnerability.
eEye's Blink® Professional Edition protects from this vulnerability.
eEye's Retina® Network Security Scanner scans devices to detect for this vulnerability.
Public PoC Code Disclosure (Code Execution - Reverse Shell)
Initial Vendor Response
3/29/2007: Proof-of-Concept Disclosed Publicly on Milw0rm
4/24/2007: Vendor-Supplied Patch Released
Copyright ©1998-2011 eEye Digital Security
Permission is hereby granted for the redistribution of this alert electronically. It is not to be edited in any way without express consent of eEye. If you wish to reprint the whole or any part of this alert in any other medium excluding electronic medium, please email alert@eEye.com for permission.
The information within this paper may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are no warranties, implied or express, with regard to this information. In no event shall the author be liable for any direct or indirect damages whatsoever arising out of or in connection with the use or spread of this information. Any use of this information is at the user's own risk.