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Category:   OS (Linux)  >   KVM Vendors:   kvm.qumranet.com
KVM Syscall Emulation Debug Error Lets Local Users on a Guest System Gain Elevated Privileges on the Guest System
SecurityTracker Alert ID:  1038782
SecurityTracker URL:  http://securitytracker.com/id/1038782
CVE Reference:   CVE-2017-7518   (Links to External Site)
Date:  Jun 23 2017
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in KVM. A local user on the guest system can gain elevated privileges on the guest system.

A local user on the guest system can trigger a debug exception error in syscall emulation to gain elevated privileges on the guest system.

Linux guest systems are not affected.

Impact:   A local user on the guest system can gain elevated privileges on the guest system.
Solution:   The vendor has issued a proposed patch, available at:

https://www.spinics.net/lists/kvm/msg151817.html

Vendor URL:  www.linux-kvm.org/ (Links to External Site)
Cause:   Exception handling error

Message History:   None.


 Source Message Contents

Subject:  [oss-security] CVE-2017-7518 Kernel: KVM: debug exception via syscall emulation

    Hello,

Linux kernel built with the Kernel-based Virtual Machine(CONFIG_KVM) support 
is vulnerable to an incorrect debug exception(#DB) error. It could occur while 
emulating a syscall instruction.

A user/process inside guest could use this flaw to potentially escalate their 
privileges inside guest.

Note: Linux guests are not affected.

Upstream patch:
---------------
   -> https://www.spinics.net/lists/kvm/msg151817.html

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1464473
   -> https://www.spinics.net/lists/kvm/msg151819.html
   -> https://xenbits.xen.org/xsa/advisory-204.html

'CVE-2017-7518' has been assigned to this issue by Red Hat Inc.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
 
 


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