FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

dbus -- multiple vulnabilities

Affected packages
dbus < 1.8.6

Details

VuXML ID e6a7636a-02d0-11e4-88b6-080027671656
Discovery 2014-07-02
Entry 2014-07-03

Simon McVittie reports:

Alban Crequy at Collabora Ltd. discovered a bug in dbus-daemon's 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 kernel's 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 Martínez Suárez 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.

References

CVE Name CVE-2014-3532
CVE Name CVE-2014-3533
URL http://lists.freedesktop.org/archives/dbus/2014-July/016235.html