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Vigil@nce - Linux kernel: denial of service via selinux_nlmsg_perm

November 2015 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

A local attacker can use malicious Netlink messages on the Linux kernel, in order to trigger a denial of service.

Impacted products: Linux.

Severity: 1/4.

Creation date: 05/11/2015.

DESCRIPTION OF THE VULNERABILITY

The Linux kernel uses Netlink sockets to exchange information about the network.

The selinux_nlmsg_perm() function of the security/selinux/hooks.c file displays an error message if the Netlink message is unknown. However, there is no rate limitation on the number of messages which can be displayed.

A local attacker can therefore use malicious Netlink messages on the Linux kernel, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/L...




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