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Research > Zero-Day Tracker > 20070329

Brightstor Backup Mediasvr.exe RPC 191

Date Disclosed:

Date Patched:

Computer Associates

Affected Software:

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.


Code Execution:

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.

Vendor-Supplied Patch

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

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