It was discovered that zeromq, a lightweight messaging kernel, is
susceptible to a protocol downgrade attack on sockets using the ZMTP v3
protocol. This could allow remote attackers to bypass ZMTP v3 security
mechanisms by sending ZMTP v2 or earlier headers.
CVE request: http://openwall.com/lists/oss-security/2015/05/07/8
Upstream bug report: https://github.com/zeromq/libzmq/issues/1273
Upstream fix: https://github.com/zeromq/zeromq4-x/commit/b6e3e0f601e2c1ec1f3aac880ed6a3fe63043e51
If I read the whiteboard correctly fedora-all/zeromq should be not affected by this attack, but in F22 and F23 it is as versions 4.0.5 are used there.
It is fixed in rawhide with:
and an update for F22 is on the way:
I believe fedora was noted as not affected as no released version include affected 4.x version.
zeromq-4.0.5-3.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
ceph-1.2 ships zeromq-3.2.5 which is not affected by this flaw.