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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
(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
SecurityTracker Alert ID:  1033570
SecurityTracker URL:  http://securitytracker.com/id/1033570
CVE Reference:   CVE-2015-5165   (Links to External Site)
Date:  Sep 16 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:   Oracle has issued a fix.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2015-1793.html

Vendor URL:  linux.oracle.com/errata/ELSA-2015-1793.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Aug 3 2015 Xen RTL8139 Device Model Memory Initialization Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information from the Host System



 Source Message Contents

Subject:  [El-errata] ELSA-2015-1793 Moderate: Oracle Linux 7 qemu-kvm security fix update

Oracle Linux Security Advisory ELSA-2015-1793

http://linux.oracle.com/errata/ELSA-2015-1793.html

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:

x86_64:
libcacard-1.5.3-86.el7_1.6.i686.rpm
libcacard-1.5.3-86.el7_1.6.x86_64.rpm
libcacard-devel-1.5.3-86.el7_1.6.i686.rpm
libcacard-devel-1.5.3-86.el7_1.6.x86_64.rpm
libcacard-tools-1.5.3-86.el7_1.6.x86_64.rpm
qemu-img-1.5.3-86.el7_1.6.x86_64.rpm
qemu-kvm-1.5.3-86.el7_1.6.x86_64.rpm
qemu-kvm-common-1.5.3-86.el7_1.6.x86_64.rpm
qemu-kvm-tools-1.5.3-86.el7_1.6.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/qemu-kvm-1.5.3-86.el7_1.6.src.rpm



Description of changes:

[1.5.3-86.el7_1.6]
- kvm-rtl8139-avoid-nested-ifs-in-IP-header-parsing-CVE-20.patch 
[bz#1248764]
- kvm-rtl8139-drop-tautologous-if-ip-.-statement-CVE-2015-.patch 
[bz#1248764]
- kvm-rtl8139-skip-offload-on-short-Ethernet-IP-header-CVE.patch 
[bz#1248764]
- kvm-rtl8139-check-IP-Header-Length-field-CVE-2015-5165.patch [bz#1248764]
- kvm-rtl8139-check-IP-Total-Length-field-CVE-2015-5165.patch [bz#1248764]
- kvm-rtl8139-skip-offload-on-short-TCP-header-CVE-2015-51.patch 
[bz#1248764]
- kvm-rtl8139-check-TCP-Data-Offset-field-CVE-2015-5165.patch [bz#1248764]
- Resolves: bz#1248764
   (CVE-2015-5165 qemu-kvm: Qemu: rtl8139 uninitialized heap memory 
information leakage to guest [rhel-7.1.z])


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