Description
The code in Apache Tomcat 9.0.0.M1 to 9.0.0.M11, 8.5.0 to 8.5.6, 8.0.0.RC1 to 8.0.38, 7.0.0 to 7.0.72, and 6.0.0 to 6.0.47 that parsed the HTTP request line permitted invalid characters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack and/or obtain sensitive information from requests other then their own.
Remediation
References
Related Vulnerabilities
Joomla! Core Remote Code Execution (1.5.0 - 3.4.5)
WordPress Plugin WordPress Calls to Action Multiple Vulnerabilities (2.3.7)
WordPress Plugin PICA Photo Gallery 'imgname' Parameter Information Disclosure (1.0)
MySQL CVE-2018-2817 Vulnerability (CVE-2018-2817)
TYPO3 Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2010-3664)