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Bug 1228220 - (CVE-2014-9731) CVE-2014-9731 Kernel: fs: udf: information leakage when reading symlink
CVE-2014-9731 Kernel: fs: udf: information leakage when reading symlink
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20141218,reported=2...
: Security
Depends On:
Blocks: 1211911
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Reported: 2015-06-04 08:29 EDT by Prasad J Pandit
Modified: 2018-08-28 17:59 EDT (History)
30 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A path length checking flaw was found in Linux kernels built with UDF file system (CONFIG_UDF_FS) support. An attacker able to mount a corrupted/malicious UDF file system image could use this flaw to leak kernel memory to user-space.
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RHEL 7.3 requirements from Atomic Host:
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Description Prasad J Pandit 2015-06-04 08:29:05 EDT 
Linux kernel built with the UDF file system(CONFIG_UDF_FS) support is
vulnerable to an information leakage issue. It could occur while reading
symlink information from corrupted/malicious udf file system image.

An unprivileged user could use this flaw to leak kernel memory bytes.

Upstream fix:
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   -> https://git.kernel.org/linus/0e5cc9a40ada6046e6bc3bdfcd0c0d7e4b706b14

Reference:
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   -> http://www.openwall.com/lists/oss-security/2015/06/03/15
Comment 1 Prasad J Pandit 2015-06-04 12:48:35 EDT 
Statement:

This issue affects the versions of the Linux kernel as shipped with
Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.
Comment 2 Prasad J Pandit 2015-06-04 12:49:20 EDT 
This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
Comment 3 Prasad J Pandit 2015-06-05 01:19:08 EDT 
Acknowledgement:

Red Hat would like to thank Carl H Lunde for reporting this issue.
Comment 5 Wade Mealing 2015-07-15 21:18:26 EDT 
Mitigation:

The UDF filesystem is enabled via loading the UDF kernel module.  The kernel module can be prevented from loading via blacklisting see https://access.redhat.com/solutions/41278 for more information.
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