The curl_easy_duphandle function in libcurl 7.17.1 through 7.38.0, when running with the CURLOPT_COPYPOSTFIELDS option, does not properly copy HTTP POST data for an easy handle, which triggers an out-of-bounds read that allows remote web servers to read sensitive memory information.
https://support.apple.com/kb/HT205031
http://www.ubuntu.com/usn/USN-2399-1
http://www.securityfocus.com/bid/70988
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.debian.org/security/2014/dsa-3069
http://rhn.redhat.com/errata/RHSA-2015-1254.html
http://lists.opensuse.org/opensuse-updates/2015-02/msg00040.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10743