It was reported that it's possible to login as "sddm" user without authentication:
This is since if sddm detects that user in the PamBackend,
if (user == "sddm")
service = "sddm-greeter";
else if (m_app->session()->path().isEmpty())
service = "sddm-check";
else if (m_autologin)
service = "sddm-autologin";
result = m_pam->start(service, user);
and the sddm-greeter PAM config basically just has a pam_permit.
More info is available at . Upstream patch is at .
Created sddm tracking bugs for this issue:
Affects: fedora-all [bug 1149628]
sddm-0.9.0-2.20141007git6a28c29b.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
sddm-0.9.0-2.20141007git6a28c29b.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.