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[3.7] dbus: DBusServer DBUS_COOKIE_SHA1 authentication bypass (CVE-2019-12749)

ID: oval:org.secpod.oval:def:1801459Date: (C)2019-06-21   (M)2023-11-10
Class: PATCHFamily: unix




dbus is the reference implementation of D-Bus, an asynchronous inter-process communication system commonly used for system services or within a desktop session on Linux and other operating systems. Joe Vennix of Apple Information Security discovered an implementation flaw in the DBUS_COOKIE_SHA1 authentication mechanism. A malicious client with write access to its own home directory could manipulate a ~/.dbus-keyrings symlink to cause a DBusServer with a different uid to read and write in unintended locations. In the worst case, this could result in the DBusServer reusing a cookie that is known to the malicious client, and treating that cookie as evidence that a subsequent client connection came from an attacker-chosen uid, allowing authentication bypass. This vulnerability does not normally affect the standard system dbus-daemon, which only allows the EXTERNAL authentication mechanism. In supported branches of dbus it also does not normally affect the standard session dbus-daemon, for the same reason. However, this vulnerability can affect third-party users of DBusServer , third-party dbus-daemon instances, standard dbus-daemon instances with non-standard configuration, and the session bus in older/unsupported dbus branches . Vulnerable versions: all = 1.13.12, 1.12.x

Platform:
Alpine Linux 3.7
Product:
dbus
Reference:
10571
CVE-2019-12749
CVE    1
CVE-2019-12749

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