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CVE-2021-33037— Incorrect Transfer-Encoding handling with HTTP/1.0

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。该程序实现了对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat存在环境问题漏洞，该漏洞源于Apache Tomcat 在某些情况下没有正确解析 HTTP 传输编码请求标头，导致在与反向代理一起使用时可能会请求走私。

AI Predicted 7.5 Difficulty: Moderate EPSS 74.67% · P99

Possible ATT&CK Techniques 1 AI

T1102 · Web Service
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I. Basic Information for CVE-2021-33037

Vulnerability Information
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Vulnerability Title
Incorrect Transfer-Encoding handling with HTTP/1.0
Source: CVE Program / CVE List V5
Vulnerability Description
Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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
Apache Tomcat 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。该程序实现了对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat存在环境问题漏洞，该漏洞源于Apache Tomcat 在某些情况下没有正确解析 HTTP 传输编码请求标头，导致在与反向代理一起使用时可能会请求走私。
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
Apache Software Foundation Apache Tomcat Apache Tomcat 10 10.0.0-M1 to 10.0.6 -

II. Public POCs for CVE-2021-33037

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III. Intelligence Information for CVE-2021-33037

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Vendor Advisories for CVE-2021-33037 (7)

Mailing List Discussions for CVE-2021-33037 (8)

Other References for CVE-2021-33037 (1)

Same Patch Batch · Apache Software Foundation · 2021-07-12 · 4 CVEs total

CVE-2021-30640 Auth weakness in JNDIRealm
CVE-2021-30639 DoS after non-blocking IO error
CVE-2021-30129 DoS/OOM leak vulnerability in Apache Mina SSHD Server

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-444

V. Comments for CVE-2021-33037

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