First published: Tue Aug 14 2018(Updated: )
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. Fixed in Apache HTTP Server 2.4.25 (Affected 2.4.1-2.4.23). Fixed in Apache HTTP Server 2.2.32 (Affected 2.2.0-2.2.31).
Credit: security@apache.org
Affected Software | Affected Version | How to fix |
---|---|---|
Apache Http Server | =2.2.0 | |
Apache Http Server | =2.2.2 | |
Apache Http Server | =2.2.3 | |
Apache Http Server | =2.2.4 | |
Apache Http Server | =2.2.6 | |
Apache Http Server | =2.2.8 | |
Apache Http Server | =2.2.9 | |
Apache Http Server | =2.2.10 | |
Apache Http Server | =2.2.11 | |
Apache Http Server | =2.2.12 | |
Apache Http Server | =2.2.13 | |
Apache Http Server | =2.2.14 | |
Apache Http Server | =2.2.15 | |
Apache Http Server | =2.2.16 | |
Apache Http Server | =2.2.17 | |
Apache Http Server | =2.2.18 | |
Apache Http Server | =2.2.19 | |
Apache Http Server | =2.2.20 | |
Apache Http Server | =2.2.21 | |
Apache Http Server | =2.2.22 | |
Apache Http Server | =2.2.23 | |
Apache Http Server | =2.2.24 | |
Apache Http Server | =2.2.25 | |
Apache Http Server | =2.2.26 | |
Apache Http Server | =2.2.27 | |
Apache Http Server | =2.2.29 | |
Apache Http Server | =2.2.31 | |
Apache Http Server | =2.4.1 | |
Apache Http Server | =2.4.2 | |
Apache Http Server | =2.4.3 | |
Apache Http Server | =2.4.4 | |
Apache Http Server | =2.4.6 | |
Apache Http Server | =2.4.7 | |
Apache Http Server | =2.4.9 | |
Apache Http Server | =2.4.10 | |
Apache Http Server | =2.4.12 | |
Apache Http Server | =2.4.16 | |
Apache Http Server | =2.4.17 | |
Apache Http Server | =2.4.18 | |
Apache Http Server | =2.4.20 | |
Apache Http Server | =2.4.23 |
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CVE-2016-4975 has a medium severity rating that permits potential HTTP response splitting attacks due to CRLF injection.
To fix CVE-2016-4975, upgrade to Apache HTTP Server version 2.4.25 or later for 2.4.x versions, or 2.2.32 or later for 2.2.x versions.
CVE-2016-4975 affects Apache HTTP Server versions 2.2.0 through 2.2.31 and versions 2.4.0 through 2.4.23.
CRLF injection refers to the exploitation of carriage return and line feed characters in HTTP requests which can lead to header manipulation.
CVE-2016-4975 was disclosed in 2016 and allowed for potential exploitation of certain Apache HTTP Server configurations.