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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System
SecurityTracker Alert ID:  1033176
SecurityTracker URL:  http://securitytracker.com/id/1033176
CVE Reference:   CVE-2015-5165   (Links to External Site)
Date:  Aug 3 2015
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on the guest system can obtain potentially sensitive information from the host system.

The QEMU RTL8139 network card model does not properly validate user-supplied input. A local user on a guest system can supply specially crafted data to view potentially sensitive information about the guest system from uninitialized portions of heap memory. The information includes data that the host administrator does not intend for the guest administrator to access, including data about physical devices backing emulated devices or about passwords.

Systems running x86 HVM guests without stubdomains configured with an emulated RTL8139 driver model are affected.

Systems using qemu-dm stubdomain device models are not affected.

Systems running only PV guests are not affected.

ARM systems are not affected.

Donghai Zhu of Alibaba reported this vulnerability.

Impact:   A local user on the guest system can obtain potentially sensitive information about the guest system from the host system.
Solution:   The vendor has issued a fix (xsa140-qemuu-4.3-1.patch, xsa140-qemuu-4.3-2.patch, xsa140-qemuu-4.3-3.patch, xsa140-qemuu-4.3-4.patch, xsa140-qemuu-4.3-5.patch, xsa140-qemuu-4.3-6.patch, xsa140-qemuu-4.3-7.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-140.html

Vendor URL:  xenbits.xen.org/xsa/advisory-140.html (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.
Aug 20 2015 (Citrix Issues Fix for Citrix XenServer) Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System
Citrix has issued a fix for Citrix XenServer.
Aug 25 2015 (Red Hat Issues Fix for QEMU) Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System
Red Hat has issued a fix for QEMU for Red Hat Enterprise Linux 7.
Sep 4 2015 (Red Hat Issues Fix for QEMU) Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System
Red Hat has issued a fix for QEMU for Red Hat Enterprise Linux 7.
Sep 8 2015 (Red Hat Issues Fix for Red Hat Enterprise Virtualization) Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System
Red Hat has issued a fix for Red Hat Enterprise Virtualization.
Sep 16 2015 (Red Hat Issues Fix for QEMU) Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System
Red Hat has issued a fix for QEMU for Red Hat Enterprise Linux 7.
Sep 16 2015 (Oracle Issues Fix for Oracle Linux) Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System
Oracle has issued a fix for Oracle Linux 7.
Sep 16 2015 (CentOS Issues Fix for QEMU) Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System
CentOS has issued a fix for QEMU for CentOS Linux 7.
Sep 24 2015 (Red Hat Issues Fix for QEMU) Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System
Red Hat has issued a fix for QEMU for Red Hat Enterprise Linux 6.



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