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CVE-2021-43844— Externally Controlled Reference to a Resource in Another Sphere in MSEdgeRedirect

Quick assessment

Affected
rcmaehl MSEdgeRedirect
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MSEdgeRedirect是将新闻、搜索、小工具、天气等重定向到默认浏览器的工具。 MSEdgeRedirect 存在安全漏洞，该漏洞源于在0.5.0.1之前的MSEdgeRedirect版本容易通过专门制作的url进行远程代码执行。攻击者可利用该漏洞控制的网页;用户会收到提示，然后下载。

CVSS 8.8 · High EPSS 3.33% · P88
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I. Basic Information for CVE-2021-43844

Vulnerability Information
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Vulnerability Title
Externally Controlled Reference to a Resource in Another Sphere in MSEdgeRedirect
Source: CVE Program / CVE List V5
Vulnerability Description
MSEdgeRedirect is a tool to redirect news, search, widgets, weather, and more to a user's default browser. MSEdgeRedirect versions before 0.5.0.1 are vulnerable to Remote Code Execution via specifically crafted URLs. This vulnerability requires user interaction and the acceptance of a prompt. With how MSEdgeRedirect is coded, parameters are impossible to pass to any launched file. However, there are two possible scenarios in which an attacker can do more than a minor annoyance. In Scenario 1 (confirmed), a user visits an attacker controlled webpage; the user is prompted with, and downloads, an executable payload; the user is prompted with, and accepts, the aforementioned crafted URL prompt; and RCE executes the payload the user previously downloaded, if the download path is successfully guessed. In Scenario 2 (not yet confirmed), a user visits an attacked controlled webpage; the user is prompted with, and accepts, the aforementioned crafted URL prompt; and a payload on a remote, attacker controlled, SMB server is executed. The issue was found in the _DecodeAndRun() function, in which I incorrectly assumed _WinAPI_UrlIs() would only accept web resources. Unfortunately, file:/// passes the default _WinAPI_UrlIs check(). File paths are now directly checked for and must fail. There is no currently known exploitation of this vulnerability in the wild. A patched version, 0.5.0.1, has been released that checks for and denies these crafted URLs. There are no workarounds for this issue. Users are advised not to accept any unexpected prompts from web pages.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
资源在另一范围的外部可控制索引
Source: CVE Program / CVE List V5
Vulnerability Title
MSEdgeRedirect 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MSEdgeRedirect是将新闻、搜索、小工具、天气等重定向到默认浏览器的工具。 MSEdgeRedirect 存在安全漏洞，该漏洞源于在0.5.0.1之前的MSEdgeRedirect版本容易通过专门制作的url进行远程代码执行。攻击者可利用该漏洞控制的网页;用户会收到提示，然后下载。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rcmaehl MSEdgeRedirect < 0.5.0.1 -

II. Public POCs for CVE-2021-43844

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III. Intelligence Information for CVE-2021-43844

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Vendor Advisories for CVE-2021-43844 (1)

Other References for CVE-2021-43844 (1)

IV. Related Vulnerabilities

Same weakness: CWE-610

V. Comments for CVE-2021-43844

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