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Research > Zero-Day Tracker > 20071019

RealNetworks RealPlayer ierpplug.dll Remote Code Execution

Date Disclosed:

Date Patched:


Affected Software:
RealPlayer 10.5
RealPlayer 11BETA

A zero-day vulnerability has been disclosed within a RealPlayer ActiveX control (ierpplug.dll). By passing in malicious parameters into this ActiveX control, an attacker would be able to leverage a buffer overflow vulnerability within the control to execute arbitrary code under the context of the logged in user. Although exploit code has not been released for this vulnerability, exploits have been seen in-the-wild.


Code Execution:

Arbitrary code execution under the context of the logged in user
ActiveX remote code execution vulnerabilities have very high impacts since the source of the malicious payload can be any site on the Internet. An even more critical problem is generated when clients are administrators on their local hosts, which would run the malicious payload with Administrator credentials.

The best form of mitigation is available by kill-bitting the CLSID for the ierpplug.dll ActiveX Control (FDC7A535-4070-4B92-A0EA-D9994BCC0DC5) following the directions of KB240797. This will disable calls to the ActiveX control from web pages, thereby mitigating these specific vulnerabilities.

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 Advisory: RealPlayer Security Vulnerability

Original Vulnerability Information Released
Preview Vulnerability In Same ActiveX

10/19/2007: Vulnerability Information Publicly Released

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