Fedora 28 update for gdm

1) Use-after-free error

EUVDB-ID: #VU14452

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

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 updates from vendor's repository.

Vulnerable software versions

Fedora: 28

gdm: before 3.28.3-1.fc28

CPE2.3

• cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*
• cpe:2.3:a:fedoraproject:gdm:*:*:*:*:*:fedora:*:*

External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-6740c38cf4

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.