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Category:   Application (Generic)  >   KVM Vendors:   kvm.qumranet.com
KVM Structure Initialization Error Lets Local Users Obtain Portions of Kernel Memory
SecurityTracker Alert ID:  1024912
SecurityTracker URL:  http://securitytracker.com/id/1024912
CVE Reference:   CVE-2010-3881   (Links to External Site)
Date:  Dec 20 2010
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in KVM. A local user can obtain portions of kernel memory.

Some structure padding and reserved fields in certain data structures in QEMU-KVM are not properly initialized. A privileged local host user with access to '/dev/kvm' can obtain portions of kernel stack memory.

The kvm_vcpu_events, kvm_debugregs, kvm_pit_state2, and kvm_clock_data structures are affected.

Impact:   A local privilege host user can obtain portions of kernel memory.
Solution:   The vendor has issued a fix, available at:

http://git.kernel.org/?p=virt/kvm/kvm.git;a=commit;h=831d9d02f9522e739825a51a11e3bc5aa531a905

Vendor URL:  kernel.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:   Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Dec 20 2010 (Red Hat Issues Fix) KVM Structure Initialization Error Lets Local Users Obtain Portions of Kernel Memory   (bugzilla@redhat.com)
Red Hat has issued a fix for Red Hat Enterprise Linux 5.
Jun 22 2011 (Red Hat Issues Fix) KVM Structure Initialization Error Lets Local Users Obtain Portions of Kernel Memory   (bugzilla@redhat.com)
Red Hat has issued a fix for Red Hat Enterprise Linux 6.0.



 Source Message Contents

Date:  Mon, 20 Dec 2010 19:29:09 +0000
Subject:  KVM


KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for
the standard Red Hat Enterprise Linux kernel.

It was found that some structure padding and reserved fields in certain
data structures in QEMU-KVM were not initialized properly before being
copied to user-space. A privileged host user with access to "/dev/kvm"
could use this flaw to leak kernel stack memory to user-space.
(CVE-2010-3881)

http://www.spinics.net/lists/kvm/msg44130.html

http://git.kernel.org/?p=virt/kvm/kvm.git;a=commit;h=831d9d02f9522e739825a51a11e3bc5aa531a905


 
 


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