libgdata before 0.10.2 and 0.11.x before 0.11.1 does not validate SSL certificates, which allows remote attackers to obtain user names and passwords via a man-in-the-middle (MITM) attack with a spoofed certificate.
https://bugzilla.novell.com/show_bug.cgi?id=752088
https://bugzilla.gnome.org/show_bug.cgi?id=671535
https://bugs.launchpad.net/ubuntu/+source/libgdata/+bug/938812
http://www.ubuntu.com/usn/USN-1547-1
http://www.openwall.com/lists/oss-security/2012/03/14/8
http://www.openwall.com/lists/oss-security/2012/03/14/3
http://www.openwall.com/lists/oss-security/2012/03/14/1
http://www.mandriva.com/security/advisories?name=MDVSA-2012:111
http://www.debian.org/security/2012/dsa-2482
http://secunia.com/advisories/50432
http://git.gnome.org/browse/libgdata/commit/?id=6799f2c525a584dc998821a6ce897e463dad7840