Apache Tomcat 8.510.x RequestSmuggling via rejectIllegalHeader=false
CVE-2022-42252 Published on November 1, 2022
Apache Tomcat request smuggling via malformed content-length
If Apache Tomcat 8.5.0 to 8.5.82, 9.0.0-M1 to 9.0.67, 10.0.0-M1 to 10.0.26 or 10.1.0-M1 to 10.1.0 was configured to ignore invalid HTTP headers via setting rejectIllegalHeader to false (the default for 8.5.x only), Tomcat did not reject a request containing an invalid Content-Length header making a request smuggling attack possible if Tomcat was located behind a reverse proxy that also failed to reject the request with the invalid header.
Vulnerability Analysis
CVE-2022-42252 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.
Weakness Type
What is a HTTP Request Smuggling Vulnerability?
When malformed or abnormal HTTP requests are interpreted by one or more entities in the data flow between the user and the web server, such as a proxy or firewall, they can be interpreted inconsistently, allowing the attacker to "smuggle" a request to one device without the other device being aware of it.
CVE-2022-42252 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2022-42252
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Affected Versions
Apache Software Foundation Apache Tomcat:- Version 10.1.0-M1, <= 10.1.0 is affected.
- Version 10.0.0-M1, <= 10.0.26 is affected.
- Version 9.0.0-M1, <= 9.0.67 is affected.
- Version 8.5.0, <= 8.5.82 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.