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Category:   Application (Generic)  >   QEMU Vendors:   QEMU.org
(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
SecurityTracker Alert ID:  1033658
SecurityTracker URL:  http://securitytracker.com/id/1033658
CVE Reference:   CVE-2015-5165   (Links to External Site)
Date:  Sep 24 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. QEMU is affected.

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:   Red Hat has issued a fix for QEMU.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1833.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1833.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

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:  [RHSA-2015:1833-01] Moderate: qemu-kvm security update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: qemu-kvm security update
Advisory ID:       RHSA-2015:1833-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1833.html
Issue date:        2015-09-22
CVE Names:         CVE-2015-5165 
=====================================================================

1. Summary:

Updated qemu-kvm packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the
user-space component for running virtual machines using KVM.

An information leak flaw was found in the way QEMU's RTL8139 emulation
implementation processed network packets under RTL8139 controller's C+ mode
of operation. An unprivileged guest user could use this flaw to read up to
65 KB of uninitialized QEMU heap memory. (CVE-2015-5165)

Red Hat would like to thank the Xen project for reporting this issue.
Upstream acknowledges Donghai Zhu of Alibaba as the original reporter.

All qemu-kvm users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. After installing this
update, shut down all running virtual machines. Once all virtual machines
have shut down, start them again for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1248760 - CVE-2015-5165 Qemu: rtl8139 uninitialized heap memory information leakage to guest (XSA-140)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
qemu-kvm-0.12.1.2-2.479.el6_7.1.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.479.el6_7.1.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.1.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-img-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.479.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
qemu-kvm-0.12.1.2-2.479.el6_7.1.src.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-img-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.479.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
qemu-kvm-0.12.1.2-2.479.el6_7.1.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.479.el6_7.1.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.1.i686.rpm

ppc64:
qemu-guest-agent-0.12.1.2-2.479.el6_7.1.ppc64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.1.ppc64.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-img-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.479.el6_7.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
qemu-kvm-0.12.1.2-2.479.el6_7.1.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.479.el6_7.1.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.1.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-img-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.479.el6_7.1.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.479.el6_7.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-5165
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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