{"id":"CVE-2014-0979","aliases":["DEBIAN-CVE-2014-0979","EUVD-2014-1009","GHSA-3wgq-2r52-v65w","MGASA-2014-0026","UBUNTU-CVE-2014-0979"],"status":"published","title":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1...","description":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1 does not properly handle the return value from the lightdm_greeter_get_authentication_user function, which allows local users to cause a denial of service (NULL pointer dereference) via an empty username.","severity":{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.0041,"percentile":0.35524,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2014-01-23T01:00:00Z","modified":"2026-10-23T15:47:37Z","fixes":[{"ecosystem":"Debian:12","package":"lightdm-gtk-greeter","fixed_in":["1.6.1-5"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"lightdm-gtk-greeter","fixed_in":["1.6.1-5"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"lightdm-gtk-greeter","fixed_in":["1.6.1-5"],"sources":["osv"]},{"ecosystem":"Mageia:3","package":"lightdm-gtk-greeter","fixed_in":["1.3.1-6.1.mga3"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"lightdm-gtk-greeter","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-5"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"lightdm-gtk-greeter","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-5"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"lightdm-gtk-greeter","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-5"}]}]},{"source":"osv","ecosystem":"Mageia:3","package":"lightdm-gtk-greeter","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.1-6.1.mga3"}]}]}],"products":[{"vendor":"lightdm_gtk\\+_greeter_project","product":"lightdm_gtk\\+_greeter"},{"vendor":"opensuse","product":"opensuse"}],"references":[{"url":"http://www.securityfocus.com/bid/64679","tags":["vdb-entry","x_refsource_BID","x_transferred","web"]},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2014-February/128150.html","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://bugzilla.novell.com/show_bug.cgi?id=857303","tags":["x_refsource_CONFIRM","x_transferred","report"]},{"url":"http://www.openwall.com/lists/oss-security/2014/01/07/15","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2014-February/128117.html","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"http://lists.opensuse.org/opensuse-updates/2014-01/msg00048.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","web"]},{"url":"http://secunia.com/advisories/56211","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"https://bugs.launchpad.net/lightdm-gtk-greeter/+bug/1266449","tags":["x_refsource_CONFIRM","x_transferred","web","report"]},{"url":"http://secunia.com/advisories/56423","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2014-0979"},{"url":"https://github.com/advisories/GHSA-3wgq-2r52-v65w"},{"url":"https://security-tracker.debian.org/tracker/CVE-2014-0979","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2014-0026.html","tags":["advisory"]},{"url":"http://openwall.com/lists/oss-security/2014/01/07/5","tags":["web"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=12238","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2014-0979","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2014-0979","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2014-0979","description":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1 does not properly handle the return value from the lightdm_greeter_get_authentication_user function, which allows local users to cause a denial of service (NULL pointer dereference) via an empty username.","status":"published","published":"2014-01-23T01:00:00Z","modified":"2024-08-06T09:34:40.438Z","updated_at":"2026-11-02T14:33:47.741012Z"}],"euvd":[{"id":"EUVD-2014-1009","description":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1 does not properly handle the return value from the lightdm_greeter_get_authentication_user function, which allows local users to cause a denial of service (NULL pointer dereference) via an empty username.","status":"published","published":"2014-01-23T01:00:00Z","modified":"2024-08-06T09:34:40Z","updated_at":"2026-11-03T01:57:19.225526Z"}],"ghsa":[{"id":"GHSA-3wgq-2r52-v65w","title":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1...","description":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1 does not properly handle the return value from the lightdm_greeter_get_authentication_user function, which allows local users to cause a denial of service (NULL pointer dereference) via an empty username.","status":"published","published":"2022-05-14T02:09:22Z","modified":"2023-02-02T05:05:15Z","updated_at":"2026-11-02T14:52:03.631935Z"}],"nvd":[{"id":"CVE-2014-0979","description":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1 does not properly handle the return value from the lightdm_greeter_get_authentication_user function, which allows local users to cause a denial of service (NULL pointer dereference) via an empty username.","status":"published","published":"2014-01-23T01:55:04.46Z","modified":"2026-06-17T00:03:57.42Z","cvss":[{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"updated_at":"2026-11-02T14:02:53.330367Z"}],"osv":[{"id":"CVE-2014-0979","description":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1 does not properly handle the return value from the lightdm_greeter_get_authentication_user function, which allows local users to cause a denial of service (NULL pointer dereference) via an empty username.","status":"published","published":"2014-01-23T01:55:04Z","modified":"2026-04-16T06:24:47.979194301Z","updated_at":"2026-11-02T15:43:59.361892Z"},{"id":"DEBIAN-CVE-2014-0979","description":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1 does not properly handle the return value from the lightdm_greeter_get_authentication_user function, which allows local users to cause a denial of service (NULL pointer dereference) via an empty username.","status":"published","published":"2014-01-23T01:55:04.46Z","modified":"2026-10-23T15:47:37.524303179Z","updated_at":"2026-11-02T15:45:25.819707Z"},{"id":"MGASA-2014-0026","title":"Updated lightdm-gtk-greeter fixes CVE-2014-0979","description":"Updated lightdm-gtk-greeter package fixes security vulnerability:\n\nlightdm-gtk-greeter uses the lightdm-gobject API incorrectly and does not\nhandle lightdm_greeter_get_authentication_user() returning NULL when the\nusername of the previous authentication is invalid resulting in a NULL pointer\ndereference in start_authentication(). This constitutes a local denial of\nservice which can be triggered by any unprivileged attacker requiring the\nintervention of an administrator to restart lightdm (CVE-2014-0979).\n","status":"published","published":"2014-01-24T21:01:31Z","modified":"2026-04-16T06:23:52.250893338Z","updated_at":"2026-11-02T15:49:39.121227Z"},{"id":"UBUNTU-CVE-2014-0979","description":"The start_authentication function in lightdm-gtk-greeter.c in LightDM GTK+ Greeter before 1.7.1 does not properly handle the return value from the lightdm_greeter_get_authentication_user function, which allows local users to cause a denial of service (NULL pointer dereference) via an empty username.","status":"withdrawn","published":"2014-01-23T01:55:00Z","modified":"2025-07-16T08:10:55.212058Z","updated_at":"2026-11-02T15:54:07.855521Z"}]}}