It was reported [1],[2] that PulseAudio suffers from a remote denial of service if the module-rtp-recv module is loaded. A remote attacker could crash this instance of PulseAudio by sending an empty UDP packet to the multicast address that module-rtp-recv is listening (due to a previous SAP/SDP announcement). The problematic code is in the pa_rtp_recv() function [3], when it handles the results of the FIONREAD ioctl. The problem has existed in PulseAudio since 2006-04-16 (git commit f1ddf0523, so probably around 0.8.1). A potential patch has been submitted upstream [4] but has not yet been accepted. [1] http://lists.freedesktop.org/archives/pulseaudio-discuss/2014-May/020740.html [2] http://openwall.com/lists/oss-security/2014/06/04/8 [3] http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/rtp/rtp.c#n185 [4] http://lists.freedesktop.org/archives/pulseaudio-discuss/2014-May/020741.html
Created attachment 902932 [details] possible patch I have attached a patch, I would update the package myself but I'm still waiting for write access to the git repository.
.. for Fedora, I forgot to mention.
The patch made it upstream: http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=26b9d22dd24c17eb118d0205bf7b02b75d435e3c
Created pulseaudio tracking bugs for this issue: Affects: fedora-all [bug 1108011]
Created pulseaudio tracking bugs for this issue: Affects: epel-5 [bug 1108013]
qemu-1.6.2-7.fc20, java-1.7.0-openjdk-1.7.0.65-2.5.1.3.fc20, qt-4.8.6-9.fc20.1, qt5-qtmultimedia-5.3.1-1.fc20.1, gnome-shell-3.10.4-7.fc20, gnome-settings-daemon-3.10.3-2.fc20, control-center-3.10.3-2.fc20, empathy-3.10.3-2.fc20, gstreamer1-plugins-good-1.2.4-2.fc20, speech-dispatcher-0.8-9.fc20, spice-gtk-0.23-3.fc20, sphinxtrain-1.0.8-13.fc20, guacamole-server-0.8.4-3.fc20, audacious-plugins-3.4.3-2.fc20, paprefs-0.9.10-7.fc20, fldigi-3.21.83-2.fc20, qmmp-0.7.7-1.fc20.1, mumble-1.2.6-1.fc20.1, libmikmod-3.3.6-3.fc20, minimodem-0.19-3.fc20, sidplayfp-1.2.0-2.fc20, xmp-4.0.7-2.fc20, gqrx-2.2.0-6.fc20, cinnamon-settings-daemon-2.2.4-2.fc20, cinnamon-control-center-2.2.10-1.fc20.1, cinnamon-2.2.14-5.fc20, phonon-4.7.2-1.fc20.1, qt-mobility-1.2.2-0.16.20140317git169da60c.fc20, fluidsynth-1.1.6-4.fc20, ffgtk-0.8.6-7.fc20, pulseaudio-5.0-7.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
Statement: Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.