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Vigil@nce: Linux kernel, buffer overflow via xfs_acl_from_disk

January 2012 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

A local attacker, who is allowed to mount an XFS filesystem, can
use a high or negative number of ACLs, in order to create an
overflow, leading to a denial of service or to code execution.

 Severity: 2/4
 Creation date: 11/01/2012

IMPACTED PRODUCTS

 Linux kernel

DESCRIPTION OF THE VULNERABILITY

The Linux kernel supports XFS filesystems.

The xfs_acl_from_disk() function of the fs/xfs/xfs_acl.c file
reads ACLs indicated on an XFS filesystem. However, if the number
of ACL is larger than XFS_ACL_MAX_ENTRIES (25), or is negative,
the xfs_acl_from_disk() function corrupts the memory.

A local attacker, who is allowed to mount an XFS filesystem, can
therefore use a high or negative number of ACLs, in order to
create an overflow, leading to a denial of service or to code
execution.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-buffer-overflow-via-xfs-acl-from-disk-11274


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