The remote Redhat Enterprise Linux 6 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2017:1721 advisory.

    The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

    Security Fix(es):

    * It was discovered that the HTTP parser in httpd incorrectly allowed certain characters not permitted by     the HTTP protocol specification to appear unencoded in HTTP request headers. If httpd was used in     conjunction with a proxy or backend server that interpreted those characters differently, a remote     attacker could possibly use this flaw to inject data into HTTP responses, resulting in proxy cache     poisoning. (CVE-2016-8743)

    Note: The fix for the CVE-2016-8743 issue causes httpd to return 400 Bad Request error to HTTP clients     which do not strictly follow HTTP protocol specification. A newly introduced configuration directive     HttpProtocolOptions Unsafe can be used to re-enable the old less strict parsing. However, such setting     also re-introduces the CVE-2016-8743 issue.

    Note: Administrators of Red Hat Satellite 5 and Red Hat Satellite Proxy 5 systems should consult Red Hat     Knowledgebase article 3013361 linked to in the Reference section before installing this update.

    Bug Fix(es):

    * Previously, httpd was unable to correctly check a boundary of an array, and in rare cases it attempted     to access an element of an array that was out of bounds. Consequently, httpd terminated unexpectedly with     a segmentation fault at proxy_util.c. With this update, bounds checking has been fixed, and httpd no     longer crashes. (BZ#1463354)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

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RHEL 6 : httpd (RHSA-2017:1721)

high Nessus Plugin ID 101385

Version 3.11