CVE-2013-7336: Null Pointer Dereference
Description of the problem:
Domblkstat is possible even with read-only connection, so whenever migration with spice is done and domblkstat gets called at the same time as qemuMonitorGetSpiceMigrationStatus(), there is certain possibility that the daemon crashes.
An unprivileged user able to issue commands to running libvirtd could use this flaw to crash libvirtd and prevent more privileged clients from working correctly.
Upstream fix: http://libvirt.org/git/?p=libvirt.git;a=commit;h=484cc321
Acknowledgements:
This issue was discovered by Marian Krcmarik of Red Hat.
Other sources
The qemuMigrationWaitForSpice function in qemu/qemumigration.c in libvirt before 1.1.3 does not properly enter a monitor when performing seamless SPICE migration, which allows local users to cause a denial of service (NULL pointer dereference and libvirtd crash) by causing domblkstat to be called at the same time as the qemuMonitorGetSpiceMigrationStatus function.
Affected Software
Remediation
Patch Available
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2013-7336?
CVE-2013-7336 is considered a moderate severity vulnerability that can cause daemon crashes.
How do I fix CVE-2013-7336?
To fix CVE-2013-7336, upgrade Red Hat Libvirt to versions above 1.1.2 or apply the relevant patches.
Which versions of Red Hat Libvirt are affected by CVE-2013-7336?
CVE-2013-7336 affects Red Hat Libvirt versions 1.0.0 to 1.1.2, including specific versions in between.
Can an unprivileged user exploit CVE-2013-7336?
Yes, an unprivileged user can potentially exploit CVE-2013-7336 under certain conditions.
What is the impact of CVE-2013-7336 on system operations?
The impact of CVE-2013-7336 includes possible disruption of virtual machine operations due to daemon crashes.