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CVE-2021-39214— Lacking Protection against HTTP Request Smuggling in mitmproxy

Quick assessment

Affected
mitmproxy mitmproxy
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.

mitmproxy是一个交互式的、支持 SSL/TLS 的拦截代理，带有用于 HTTP/1、HTTP/2 和 WebSockets 的控制台界面。 mitmproxy 7.0.2及之前版本存在环境问题漏洞，恶意客户端/服务器可以通过mitmproxy将请求/响应作为另一个请求/响应的HTTP消息体的一部分走私。该漏洞已在mitmproxy 7.0.3及更高版本中修复。

CVSS 8.1 · High EPSS 1.05% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-39214

Vulnerability Information
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Vulnerability Title
Lacking Protection against HTTP Request Smuggling in mitmproxy
Source: CVE Program / CVE List V5
Vulnerability Description
mitmproxy is an interactive, SSL/TLS-capable intercepting proxy. In mitmproxy 7.0.2 and below, a malicious client or server is able to perform HTTP request smuggling attacks through mitmproxy. This means that a malicious client/server could smuggle a request/response through mitmproxy as part of another request/response's HTTP message body. While a smuggled request is still captured as part of another request's body, it does not appear in the request list and does not go through the usual mitmproxy event hooks, where users may have implemented custom access control checks or input sanitization. Unless one uses mitmproxy to protect an HTTP/1 service, no action is required. The vulnerability has been fixed in mitmproxy 7.0.3 and above.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
mitmproxy环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mitmproxy是一个交互式的、支持 SSL/TLS 的拦截代理，带有用于 HTTP/1、HTTP/2 和 WebSockets 的控制台界面。 mitmproxy 7.0.2及之前版本存在环境问题漏洞，恶意客户端/服务器可以通过mitmproxy将请求/响应作为另一个请求/响应的HTTP消息体的一部分走私。该漏洞已在mitmproxy 7.0.3及更高版本中修复。
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
mitmproxy mitmproxy < 7.0.3 -

II. Public POCs for CVE-2021-39214

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III. Intelligence Information for CVE-2021-39214

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Vendor Advisories for CVE-2021-39214 (1)

IV. Related Vulnerabilities

Same product: mitmproxy
Same vendor: mitmproxy
Same weakness: CWE-444

V. Comments for CVE-2021-39214

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