libssh 0.5.3 release fixes multiple security issues

[Vincent Danen <vdanen () redhat com>]

As reported to distros@ on 20121114:

A number of flaws were found in libssh prior to 0.5.3 by Xi Wang and Florian
Weimer of the Red Hat Product Security Team:

CVE-2012-4559: multiple double free() flaws
CVE-2012-4560: multiple buffer overflow flaws
CVE-2012-4561: multiple invalid free() flaws
CVE-2012-4562: multiple improper overflow checks

http://www.libssh.org/2012/11/20/libssh-0-5-3-security-release/
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-4559
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-4560
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-4561
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-4562

Patches for the flaws are attached to the bugs in our bugzilla.

--
Vincent Danen / Red Hat Security Response Team