Mozilla Network Security Services (NSS) before 3.15.4, as used in Mozilla Firefox before 27.0, Firefox ESR 24.x before 24.3, Thunderbird before 24.3, SeaMonkey before 2.24, and other products, does not properly restrict public values in Diffie-Hellman key exchanges, which makes it easier for remote attackers to bypass cryptographic protection mechanisms in ticket handling by leveraging use of a certain value.

Martin Holst Swende discovered a flaw in the way modheaders handled chunked requests. A remote attacker could use this flaw to bypass intended modheaders restrictions, allowing them to send requests to applications that include headers that should have been removed by modheaders.

Discussion and a possible patch is available from the following thread:

http://marc.info/?t=138219209900002&r=1&w=2

References:

http://martin.swende.se/blog/HTTPChunked.html

If an authorization script for LuaAuthzProvider were provided in the configuration multiple times, only the arguments of the last specification were used when invoking the script. This could lead to scripts being invoked with unexpected arguments.

Further details are available in the thread of the original report and bug:

http://www.openwall.com/lists/oss-security/2014/11/28/5

https://issues.apache.org/bugzilla/showbug.cgi?id=57204

Upstream fix:

https://github.com/apache/httpd/commit/3f1693d558d0758f829c8b53993f1749ddf6ffcb

This affects Apache HTTP Server versions 2.3 and later (such as what is shipped in Red Hat Enterprise Linux 7), as modlua is not available in earlier releases. Note that support for LuaAuthzProvider is experimental.

It was reported that if Content-Type header value is empty, httpd with modcache enabled will segfault: https://issues.apache.org/bugzilla/showbug.cgi?id=56924

Upstream patch: http://svn.apache.org/viewvc?view=revision&revision=1624234

The default configuration for cURL and libcurl before 7.42.1 sends custom HTTP headers to both the proxy and destination server, which might allow remote proxy servers to obtain sensitive information by reading the header contents.