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Additional alert that the user gets during the MiTM attack However, in experience, many users click “Yes” to proceed, to use the application. As the request is sent via HTTPS, the user of WinRAR will get a notification about the insecure self-signed certificate that Burp uses. We set up our local Burp Suite as a default Windows proxy and try to intercept traffic and to understand more about why this was happening and whether it would be possible to exploit this error. Microsoft MSHTML Remote Code Execution Vulnerability This window uses mshtml.dll implementation for Borland C++ in which WinRAR has been written. This was surprising as the error indicates that the Internet Explorer engine is rendering this error window.Īfter a few experiments, it became clear that once the trial period has expired, then about one time out of three launches of WinRAR.exe application result in this notification window being shown. We had installed and used the application for some period, when it produced a JavaScript error: Error that indicates WebBrowser JS parser inside of WinRAR We found this vulnerability by chance, in WinRAR version 5.70. After which a user may continue to use the applications with some features disabled. It is distributed as trialware, allowing a user to experience the full features of the application for a set number of days. It allows for the creation and unpacking of common archive formats such as RAR and ZIP. WinRAR is an application for managing archive files on Windows operating systems. It has been assigned the CVE ID – CVE-2021-35052.

This can be used to achieve Remote Code Execution (RCE) on a victim’s computer. This vulnerability allows an attacker to intercept and modify requests sent to the user of the application. In this article we discuss a vulnerability in the trial version of WinRAR which has significant consequences for the management of third-party software.