Denial of service in GNOME Display Manager

1) Use-after-free error

EUVDB-ID: #VU14452

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-14424

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The vulnerability exists due to use-after-free error when unproper unexporting of display objects from its D-Bus interface when they are destroyed. A local attacker can use a specially crafted sequence of D-Bus method calls, trigger memory corruption and cause the service to crash or execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

GNOME Display Manager: 3.0.0 - 3.29.1

External links

http://gitlab.gnome.org/GNOME/gdm/issues/401

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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