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Vigil@nce - Linux kernel: descriptor leak via VHOST_SET_LOG_FD
September 2015 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A privileged local attacker, accessing to /dev/vhost-net, can
create a descriptor leak via VHOST_SET_LOG_FD on the Linux kernel,
in order to trigger a denial of service.
Impacted products: Linux.
Severity: 1/4.
Creation date: 18/08/2015.
DESCRIPTION OF THE VULNERABILITY
The Linux kernel uses the vhost driver for virtualized
environments.
The VHOST_SET_LOG_FD defines the file descriptor where errors have
to be logged. However, the vhost_dev_ioctl() function does not
save its value, and this descriptor is thus never closed.
A privileged local attacker, accessing to /dev/vhost-net, can
therefore create a descriptor leak via VHOST_SET_LOG_FD on the
Linux kernel, in order to trigger a denial of service.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/Linux-kernel-descriptor-leak-via-VHOST-SET-LOG-FD-17692
