mod_userdir CRLF injection (CVE-2016-4975)

How it was found

Possible CRLF injection allowing HTTP response splitting attacks for sites which use mod_userdir. This issue was mitigated by changes made in 2.4.25 and 2.2.32 which prohibit CR or LF injection into the "Location" or other outbound header key or value.

Reported to security team 24th July 2016 Issue public 14th August 2018 Update Released 20th December 2016 Affects 2.4.23, 2.4.20, 2.4.18, 2.4.17, 2.4.16, 2.4.12, 2.4.10, 2.4.9, 2.4.7, 2.4.6, 2.4.4, 2.4.3, 2.4.2, 2.4.1

https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2016-4975 https://httpd.apache.org/security/vulnerabilities_22.html#CVE-2016-4975

Impact

CRLF Injection