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OpenVZ Kernel 2.6.32 Memory Leaks

OpenVZ Kernel 2.6.32 Memory Leaks
Posted Jul 5, 2013
Authored by Jonathan Salwan

OpenVZ kernel version 2.6.32 suffers from multiple memory leaks.

tags | advisory, kernel, memory leak
advisories | CVE-2013-2239
SHA-256 | 8564ad61e7645a172b677d9f8cf2e6d215eaeb5a393a80fab15d31814d976364

OpenVZ Kernel 2.6.32 Memory Leaks

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CVE-2013-2239 - Multiple memory leaks in OpenVZ kernel 2.6.32 (042stab080.1)


Description
===========

Two memory leaks was discovered in the versions before vzkernel
patch 042stab080.2.

One memory leak in ploop:

The ploop_getdevice_ioc function in drivers/block/ploop/dev.c in
the vzkernel patch before 042stab080.2 does not initialize a certain
length variable, which allows local users to obtain sensitive
information from kernel stack memory.

One memory leak in quota:

The compat_quotactl function in fs/quota/quota.c in the vzkernel patch
before 042stab080.2 does not initialize a certain length variable,
which allows local users to obtain sensitive information from kernel
stack memory.

Fixed in the 042stab080.2

- [security/ploop] memory info leak fixed (PSBM-20690)
- [security/quota] memory info leak fixed (PSBM-20690)


Classification
==============

Location : Local Access Required
Attack Type : Information Disclosure, Input Manipulation
Version : vzkernel 2.6.32 (Patch 042stab080.1)
Impact : Loss of Confidentiality
Solution : Patch / RCS
Disclosure : Vendor Verified


References
==========

CVE ID : CVE-2013-2239
Changelog : http://wiki.openvz.org/Download/kernel/rhel6-testing/042stab080.2
Credit : Jonathan Salwan (Sysdream Security Lab)


Timeline
========

2013-06-16 : Bugs found
2013-06-19 : Bugs reported
2013-06-28 : Bugs fixed
2013-06-29 : CVE request
2013-07-04 : CVE assigned



Thanks,

- -- Jonathan


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