#VU49165 Use-after-free in D-Bus

Vulnerability identifier: #VU49165

Vulnerability risk: Low

CVSSv4.0: 4.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
D-Bus
Client/Desktop applications / Messaging software

Vendor: Freedesktop.org

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error when processing different usernames with the same numeric uid. A local user with ability to change own uid can trigger a use-after-free error and escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

D-Bus: 1.12.0 - 1.12.18

---

External links
https://lists.freedesktop.org/archives/ftp-release/2020-July/000758.html

---

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.