2.1 Low
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
0.001 Low
EPSS
Percentile
36.4%
Simon McVittie reports:
Alban Crequy at Collabora Ltd. discovered a bug in dbus-daemonβs
support for file descriptor passing. A malicious process could
force system services or user applications to be disconnected
from the D-Bus system bus by sending them a message containing
a file descriptor, then causing that file descriptor to exceed
the kernelβs maximum recursion depth (itself introduced to fix
a DoS) before dbus-daemon forwards the message to the victim
process. Most services and applications exit when disconnected
from the system bus, leading to a denial of service.
Additionally, Alban discovered that bug fd.o#79694, a bug
previously reported by Alejandro MartΓnez SuΓ‘rez which was n
believed to be security flaw, could be used for a similar denial
of service, by causing dbus-daemon to attempt to forward invalid
file descriptors to a victim process when file descriptors become
associated with the wrong message.