Fixes the following security issues:
- CVE-2019-12749: Do not attempt to carry out DBUS_COOKIE_SHA1
authentication for identities that differ from the user running the
DBusServer. Previously, a local attacker could manipulate symbolic links
in their own home directory to bypass authentication and connect to a
DBusServer with elevated privileges. The standard system and session
dbus-daemons in their default configuration were immune to this attack
because they did not allow DBUS_COOKIE_SHA1, but third-party users of
DBusServer such as Upstart could be vulnerable. Thanks to Joe Vennix of
Apple Information Security.
For details, see the advisory:
https://www.openwall.com/lists/oss-security/2019/06/11/2
Also contains a number of other smaller fixes, including fixes for memory
leaks. For details, see NEWS:
https://gitlab.freedesktop.org/dbus/dbus/blob/dbus-1.12/NEWS
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
992b106d1d