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CVE-2021-43844— MSEdgeRedirect 安全漏洞

一分钟漏洞结论

影响对象
rcmaehl MSEdgeRedirect
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

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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一、 漏洞 CVE-2021-43844 基础信息

漏洞信息
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Vulnerability Title
Externally Controlled Reference to a Resource in Another Sphere in MSEdgeRedirect
来源: 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.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
资源在另一范围的外部可控制索引
来源: CVE Program / CVE List V5
Vulnerability Title
MSEdgeRedirect 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
rcmaehl MSEdgeRedirect < 0.5.0.1 -

二、漏洞 CVE-2021-43844 的公开POC

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三、漏洞 CVE-2021-43844 的情报信息

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CVE-2021-43844 厂商安全公告 (1)

CVE-2021-43844 其他参考 (1)

IV. Related Vulnerabilities

Same weakness: CWE-610

V. Comments for CVE-2021-43844

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