Debian Linux Security Advisory 2991-1 - Martin Holst Swende discovered a flaw in the way chunked requests are handled in ModSecurity, an Apache module whose purpose is to tighten the Web application security. A remote attacker could use this flaw to bypass intended mod_security restrictions by using chunked transfer coding with a capitalized Chunked value in the Transfer-Encoding HTTP header, allowing to send requests containing content that should have been removed by mod_security.
0825c96504b99d210fe961acdb714473b46a1f7fcddf8251e31b0490e8e42c0c