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

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Debian Security Advisory DSA-2991-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
http://www.debian.org/security/                      Salvatore Bonaccorso
July 27, 2014                          http://www.debian.org/security/faq
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Package        : modsecurity-apache
CVE ID         : CVE-2013-5705

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.

For the stable distribution (wheezy), this problem has been fixed in
version 2.6.6-6+deb7u2.

For the testing distribution (jessie), this problem has been fixed in
version 2.7.7-1.

For the unstable distribution (sid), this problem has been fixed in
version 2.7.7-1.

We recommend that you upgrade your modsecurity-apache packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

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