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."

Affected: Ubuntu:14.04:LTS: apache2

Martin Holst Swende discovered that the mod_headers module allowed HTTP trailers to replace HTTP headers during request processing. A remote attacker could possibly use this issue to bypass RequestHeaders directives. (CVE-2013-5704)

Mark Montague discovered that the mod_cache module incorrectly handled empty HTTP Content-Type headers. A remote attacker could use this issue to cause the server to stop responding, leading to a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 14.10. (CVE-2014-3581)

Teguh P. Alko discovered that the mod_proxy_fcgi module incorrectly handled long response headers. A remote attacker could use this issue to cause the server to stop responding, leading to a denial of service. This issue only affected Ubuntu 14.10. (CVE-2014-3583)

It was discovered that the mod_lua module incorrectly handled different arguments within different contexts. A remote attacker could possibly use this issue to bypass intended access restrictions. This issue only affected Ubuntu 14.10. (CVE-2014-8109)

Guido Vranken discovered that the mod_lua module incorrectly handled a specially crafted websocket PING in certain circumstances. A remote attacker could possibly use this issue to cause the server to stop responding, leading to a denial of service. This issue only affected Ubuntu 14.10. (CVE-2015-0228)