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Vigil@nce: Linux kernel, denial of service via find_keyring_by_name

April 2010 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker can use keyctl, in order to force the kernel to
use an invalid memory area, which stops it.

 Severity: 1/4
 Creation date: 27/04/2010

DESCRIPTION OF THE VULNERABILITY

The keyctl feature is used by users and processes to store keys in
the kernel:
 KEY_SPEC_PROCESS_KEYRING : current process
 KEY_SPEC_USER_SESSION_KEYRING : current shell (session)
 etc.

The find_keyring_by_name() function searches a key from its name.
However, if the user recently closed a session, this function can
return a key recently freed. Its usage stops the kernel.

A local attacker can therefore use keyctl, in order to force the
kernel to use an invalid memory area, which stops it.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-find-keyring-by-name-9616


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