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CVE-2020-12049

Published: 8 June 2020

An issue was discovered in dbus >= 1.3.0 before 1.12.18. The DBusServer in libdbus, as used in dbus-daemon, leaks file descriptors when a message exceeds the per-message file descriptor limit. A local attacker with access to the D-Bus system bus or another system service's private AF_UNIX socket could use this to make the system service reach its file descriptor limit, denying service to subsequent D-Bus clients.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
dbus
Launchpad, Ubuntu, Debian
bionic
Released (1.12.2-1ubuntu1.2)
eoan
Released (1.12.14-1ubuntu2.1)
focal
Released (1.12.16-2ubuntu2.1)
trusty
Released (1.6.18-0ubuntu4.5+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (1.12.18,1.10.30)
xenial
Released (1.10.6-1ubuntu3.6)
Patches:
upstream: https://gitlab.freedesktop.org/dbus/dbus/-/commit/272d484283883fa9ff95b69d924fff6cd34842f5
upstream: https://gitlab.freedesktop.org/dbus/dbus/-/commit/8bc1381819e5a845331650bfa28dacf6d2ac1748 (test)

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H