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Vigil@nce - Linux kernel: denial of service via EXT4_ORPHAN_FS

May 2013 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can mount an ext4 filesystem with no journal and using an orphan extend, to create an infinite loop in the Linux kernel, in order to trigger a denial of service.

Impacted products: Linux

Severity: 2/4

Creation date: 26/04/2013

DESCRIPTION OF THE VULNERABILITY

The ext4 filesystem uses the EXT4_ORPHAN_FS flag to indicate that an "extend" is orphan.

The ext4_orphan_cleanup() function is called to fix the problem. However, if there is no ext4 journal, the ext4_orphan_del() function immediately returns, without removing the inode. The function then indefinitely continues to process this inode.

An attacker can therefore mount an ext4 filesystem with no journal and using an orphan extend, to create an infinite loop in 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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