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Vigil@nce: Linux kernel, memory reading via XFS FSGEOMETRY_V1

February 2011 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can use FSGEOMETRY_V1 ioctls on a XFS filesystem, in order to obtain four bytes from the kernel memory.

- Severity: 1/4
- Creation date: 16/02/2011

IMPACTED PRODUCTS

- Linux kernel

DESCRIPTION OF THE VULNERABILITY

The XFS_IOC_FSGEOMETRY_V1 and XFS_IOC_FSGEOMETRY_V1_32 ioctls return information about the geometry of a XFS filesystem.

These ioctls call the xfs_fs_geometry() function. However, this function does not initialize the logsunit field (integer of 32 bit) of the xfs_fsop_geom_t structure. This structure is then returned to the user.

An attacker can therefore use FSGEOMETRY_V1 ioctls on a XFS filesystem, in order to obtain four bytes from the kernel memory.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

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




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