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.
"CWE-476: NULL Pointer Dereference"
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service
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[oss-security] 20140107 Re: CVE request: lightdm-gtk-greeter - local DOS due to NULL pointer dereference