Input validation error in Apache HTTP Server - CVE-2020-11985
Published: August 8, 2020
Vulnerability identifier: #VU35776
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-11985
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a spoofing attack.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can spoof the user's IP address when proxying using mod_remoteip and mod_rewrite, as a result the fake IP address will be displayed in logs and will be passed to PHP scripts.
Depending on web application functionality this vulnerability can be used to bypass authorization checks based on IP addresses.
Affected software
Apache HTTP Server
Gentoo Linux
Fedora
httpd (Red Hat package)
httpd
Gentoo Linux
Fedora
httpd (Red Hat package)
httpd
How to mitigate CVE-2020-11985
Install updates from vendor's website.
Apache HTTP Server - update to 2.4.24
httpd (Red Hat package) - update to 2.4.6-40.el7
httpd - addressed in versions 2.4.46-1.fc31, 2.4.46-1.fc32
httpd (Red Hat package) - update to 2.4.6-40.el7
httpd - addressed in versions 2.4.46-1.fc31, 2.4.46-1.fc32