CVE-2012-4561

The (1) publickey_make_dss, (2) publickey_make_rsa, (3)
signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id
functions in keys.c in libssh before 0.5.3 free “an invalid pointer on an
error path,” which might allow remote attackers to cause a denial of
service (crash) via unspecified vectors.

Bugs

• <https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-4561&gt;