Input validation error in GNOME Display Manager

1) Input validation error

EUVDB-ID: #VU41741

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-7273

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

GNOME Display Manager (gdm) 3.4.1 and earlier, when disable-user-list is set to true, allows local users to cause a denial of service (unable to login) by pressing the cancel button after entering a user name.

Mitigation

Install update from vendor's website.

Vulnerable software versions

GNOME Display Manager: 3.0.0 - 3.4.0.1

External links

http://www.openwall.com/lists/oss-security/2014/01/07/10
http://www.openwall.com/lists/oss-security/2014/01/07/16
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683338
http://bugzilla.gnome.org/show_bug.cgi?id=704284
http://bugzilla.redhat.com/show_bug.cgi?id=1050745

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.