CVE-2019-12749 – dbus: DBusServer DBUS_COOKIE_SHA1 authentication bypass

https://notcve.org/view.php?id=CVE-2019-12749

dbus before 1.10.28, 1.12.x before 1.12.16, and 1.13.x before 1.13.12, as used in DBusServer in Canonical Upstart in Ubuntu 14.04 (and in some, less common, uses of dbus-daemon), allows cookie spoofing because of symlink mishandling in the reference implementation of DBUS_COOKIE_SHA1 in the libdbus library. (This only affects 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. dbus anterior a versión 1.10.28, versión 1.12.x anterior a 1.12.16, y versión 1.13.x anterior a 1.13.12, como es usado en DBusServer en Canonst Upstart en Ubuntu versión 14.04 (y en algunos usos menos comunes de demonio dbus), permite suplantación de identidad de cookie debido al manejo inapropiado de enlaces simbólicos (symlink) en la implementación de referencia de DBUS_COOKIE_SHA1 en la biblioteca libdbus. (Esto solo afecta el mecanismo de autenticación DBUS_COOKIE_SHA1). • http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00059.html http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00092.html http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00026.html http://www.openwall.com/lists/oss-security/2019/06/11/2 http://www.securityfocus.com/bid/108751 https://access.redhat.com/errata/RHSA-2019:1726 https://access.redhat.com/errata/RHSA-2019:2868 https://access.redhat.com/errata/RHSA-2019:2870 https://access.red • CWE-59: Improper Link Resolution Before File Access ('Link Following') CWE-287: Improper Authentication •