Vulnerability CVE-2019-12749: Information
Description
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.
Severity: HIGH (7.1) Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| dbus | sisyphus | 1.12.16-alt1 | 1.14.10-alt1 | ALT-PU-2019-3092-1 | 240314 | Fixed |
| dbus | p10 | 1.12.16-alt1 | 1.14.10-alt1 | ALT-PU-2019-3092-1 | 240314 | Fixed |
| dbus | p9 | 1.12.16-alt2 | 1.12.16-alt2 | ALT-PU-2019-3127-1 | 240607 | Fixed |
| dbus | c10f1 | 1.12.16-alt1 | 1.14.8-alt1 | ALT-PU-2019-3092-1 | 240314 | Fixed |
| dbus | c9f2 | 1.12.16-alt2 | 1.12.16-alt2.c9f2.1 | ALT-PU-2019-3127-1 | 240607 | Fixed |