#VU83533 Inconsistent interpretation of HTTP requests in Apache Tomcat - CVE-2023-46589

Vulnerability identifier: #VU83533

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-46589

CWE-ID: CWE-444

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Tomcat
Server applications / Web servers

Vendor: Apache Foundation

Description

The vulnerability allows a remote attacker to perform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests when parsing malformed trailer headers. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apache Tomcat: 8.5.0 - 8.5.95, 9.0.0-M1 - 9.0.82, 10.0.0-M1 - 10.0.27, 10.1.0-M1 - 10.1.15, 11.0.0-M1 - 11.0.0-M10

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External links
https://lists.apache.org/thread/0rqq6ktozqc42ro8hhxdmmdjm1k1tpxr
https://github.com/apache/tomcat/commit/6f181e1062a472bc5f0234980f66cbde42c1041b
https://github.com/apache/tomcat/commit/b5776d769bffeade865061bc8ecbeb2b56167b08
https://github.com/apache/tomcat/commit/7a2d8818fcea0b51747a67af9510ce7977245ebd
https://github.com/apache/tomcat/commit/aa92971e879a519384c517febc39fd04c48d4642

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.