Denial of service in Freedesktop dbus

1) Memory leak

EUVDB-ID: #VU29105

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-12049

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

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 - 1.13.14

External links

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

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.