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CVE-2019-12749

Published: 11 June 2019

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.

Priority

Medium

CVSS 3 base score: 7.1

Status

Package Release Status
dbus
Launchpad, Ubuntu, Debian
bionic
Released (1.12.2-1ubuntu1.1)
cosmic
Released (1.12.10-1ubuntu2.1)
disco
Released (1.12.12-1ubuntu1.1)
precise
Released (1.4.18-1ubuntu1.9)
trusty
Released (1.6.18-0ubuntu4.5+esm1)
upstream Needs triage

xenial
Released (1.10.6-1ubuntu3.4)