HTTP request smuggling in Apache Tomcat

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU83533

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-46589

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

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 - 11.0.0-M10

External links

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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