CVE-2019-12749

Source
Severity High
Remote No
Type Access restriction bypass
Description
It has been discovered that dbus before 1.12.16 allows cookie spoofing because of symlink mishandling in the reference implementation of DBUS_COOKIE_SHA1 in the libdbus library. This issue 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.
Group Package Affected Fixed Severity Status Ticket
AVG-974 dbus 1.12.14-1 1.12.16-1 High Fixed
Date Advisory Group Package Severity Description
18 Jun 2019 ASA-201906-16 AVG-974 dbus High access restriction bypass
References
https://www.openwall.com/lists/oss-security/2019/06/11/2
https://gitlab.freedesktop.org/dbus/dbus/issues/269
https://gitlab.freedesktop.org/dbus/dbus/commit/47b1a4c41004bf494b87370987b222c934b19016