#VU29105 Memory leak in dbus - CVE-2020-12049

Vulnerability identifier: #VU29105

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-12049

CWE-ID: CWE-401

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
dbus
Universal components / Libraries / Libraries used by multiple products

Vendor: Freedesktop.org

Description
The vulnerability allows a local user to perform DoS attack on the target system.

The vulnerability exists due memory leak in libdbus when a message exceeds the per-message file descriptor limit. A local user with access to the D-Bus system bus or another system service's private AF_UNIX socket can make the system service reach its file descriptor limit, denying service to subsequent D-Bus clients.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

dbus: 1.3.0 - 1.3.1, 1.4.0 - 1.4.26, 1.5.0 - 1.5.12, 1.6.0 - 1.6.30, 1.7.0 - 1.7.10, 1.8.0 - 1.8.22, 1.9.0 - 1.9.20, 1.10.0 - 1.13.14

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External links
https://www.openwall.com/lists/oss-security/2020/06/04/3
https://gitlab.freedesktop.org/dbus/dbus/-/issues/294
https://gitlab.freedesktop.org/dbus/dbus/-/tags/dbus-1.10.30
https://gitlab.freedesktop.org/dbus/dbus/-/tags/dbus-1.12.18
https://gitlab.freedesktop.org/dbus/dbus/-/tags/dbus-1.13.16

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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.