Amazon Linux AMI Security Advisory: ALAS-2017-921
Advisory Release Date: 2017-11-02 20:21 Pacific
Advisory Updated Date: 2017-11-03 05:56 Pacific
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A regression was found in httpd, causing comments in the "Allow" and "Deny" configuration lines to be parsed incorrectly. A web administrator could unintentionally allow any client to access a restricted HTTP resource. (CVE-2017-12171)
Run yum update httpd to update your system.