Mandriva Linux Security Advisory 2014-174 – The mod_headers module in the Apache HTTP Server 2.2.22 allows remote attackers to bypass RequestHeader unset directives by placing a header in the trailer portion of data sent with chunked transfer coding. NOTE: the vendor states this is not a security issue in httpd as such. The updated packages have been upgraded to the latest 2.2.29 version which is not vulnerable to this issue.