CVE-2019-12749
dbus - security update
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.
How to fix CVE-2019-12749
To remediate CVE-2019-12749, upgrade the affected package to a fixed version below.
- —upgrade to 1.12.16-r0 or later
- —upgrade to 1.12.16-1 or later
- —upgrade to 1.8.22-0+deb8u2 or later
- —upgrade to 1.10.28-0+deb9u1 or later
Is CVE-2019-12749 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1.12.16-r0
- from 0, < 1.12.16-1
- from 0, < 1.8.22-0+deb8u2
- from 0, < 1.10.28-0+deb9u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.1 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |