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Vigil@nce: Linux kernel, denial of service via unix socket

November 2010 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker can use several unix sockets, in order to create a denial of service.

- Severity: 1/4
- Creation date: 24/11/2010

DESCRIPTION OF THE VULNERABILITY

A program can create different socket types: tcp, udp, unix, etc.

When a program using unix sockets ends, the kernel calls the wait_for_unix_gc() (Garbage Collector) function of the net/unix/garbage.c file, in order to free resources.

However, this function does not call unix_gc() to immediately free resources. When several programs run, the quantity of resources waiting to be freed increases, until all memory is depleted.

A local attacker can therefore use several unix sockets, in order to create a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

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




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