Improper Authentication in D-Bus - CVE-2019-12749
Published: July 21, 2019
Vulnerability identifier: #VU19274
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2019-12749
CWE-ID: CWE-287
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Freedesktop.org
Affected software:
D-Bus
D-Bus
Detailed vulnerability description
The vulnerability allows a an attacker to bypass authentication process.
The vulnerability exists due to an error when handling symlinks within the reference implementation of DBUS_COOKIE_SHA1 in the libdbus library. A malicious client with access to to its own home directory can manipulate a ~/.dbus-keyrings symlink to cause a DBusServer with a different uid to read and write into unintended locations.
Successful exploitation of the vulnerability may allow an attacker to bypass DBUS_COOKIE_SHA1 authentication mechanis.
How to mitigate CVE-2019-12749
Install updates from vendor's website.