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vulnerability announce CVE-2013-4299

Linux kernel: information disclosure via device-mapper

Synthesis of the vulnerability

An attacker can create metadata via the device-mapper of the Linux kernel, in order to read the content of free disk blocks.
Impacted products: Debian, Linux, RHEL, SUSE Linux Enterprise Desktop, SLES.
Severity: 2/4.
Creation date: 17/10/2013.
Identifiers: 1004233, BID-63183, CVE-2013-4299, DSA-2906-1, RHSA-2013:1436-01, RHSA-2013:1449-01, RHSA-2013:1450-01, RHSA-2013:1490-01, RHSA-2013:1519-01, RHSA-2013:1520-01, RHSA-2013:1783-01, RHSA-2013:1860-01, SUSE-SU-2014:0908-1, SUSE-SU-2014:0909-1, SUSE-SU-2014:0910-1, SUSE-SU-2014:0911-1, SUSE-SU-2014:0912-1, VIGILANCE-VUL-13612.

Description of the vulnerability

The device-mapper subsystem is used to access to hard disks.

The Snapshot feature is used to create a fixed image, in order to save it for example, and allows the edition of data, which are synchronized later. However, the read_exceptions() function of the drivers/md/dm-snap-persistent.c file does not check if user's data contain metadata (control) data.

An attacker can therefore create metadata via the device-mapper of the Linux kernel, in order to read the content of free disk blocks.
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