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T-626: Xen Multiple Buffer Overflow and Integer Overflow Vulnerabilities

May 19, 2011 - 3:05pm

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PROBLEM:

Xen Multiple Buffer Overflow and Integer Overflow Vulnerabilities

PLATFORM:

XenSource Xen 3.3.1, XenSource Xen 3.3, XenSource Xen 3.2, XenSource Xen 3.1.2, XenSource Xen 3.1.1, XenSource Xen 3.0.3, XenSource Xen 4.0, XenSource Xen 3.0, RedHat Enterprise Linux Virtualization 5 server, RedHat Enterprise Linux Desktop Multi OS 5 client ,RedHat Enterprise Linux 5 server, Red Hat Fedora 15 ,and Red Hat Enterprise Linux Desktop 5 client

ABSTRACT:

It was found that the xc_try_bzip2_decode() and xc_try_lzma_decode() decode routines did not correctly check for a possible buffer size overflow in the decoding loop. As well, several integer overflow flaws and missing error/range checking were found that could lead to an infinite loop. A privileged guest user could use these flaws to crash the guest or, possibly, execute arbitrary code in the privileged management domain (Dom0). (CVE-2011-1583)

reference LINKS:

SecuirtyFocus Bugtraq ID:47779
Mitre Reference
Red Hat alert RHSA-2011:0496-01 (xen)

Opera Mobile

IMPACT ASSESSMENT:

High

Discussion:

It was found that the xc_try_bzip2_decode() and xc_try_lzma_decode() decode routines did not correctly check for a possible buffer size overflow in the decoding loop. As well, several integer overflow flaws and missing error/range checking were found that could lead to an infinite loop. A privileged guest user could use these flaws to crash the guest or, possibly, execute arbitrary code in the privileged management domain (Dom0). (CVE-2011-1583)

All xen users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

Successful exploitation may allow execution of arbitrary code.

Solution:

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

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259

Bugs fixed (http://bugzilla.redhat.com/):

696927 - CVE-2011-1583 xen: insufficiencies in pv kernel image validation

Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/...

i386: xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm xen-libs-3.0.3-120.el5_6.2.i386.rpm

x86_64: xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm xen-debuginfo-3.0.3-120.el5_6.2.x86_64.rpm xen-libs-3.0.3-120.el5_6.2.i386.rpm xen-libs-3.0.3-120.el5_6.2.x86_64.rpm

RHEL Desktop Multi OS (v. 5 client):

Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/...

i386: xen-3.0.3-120.el5_6.2.i386.rpm xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm xen-devel-3.0.3-120.el5_6.2.i386.rpm

x86_64: xen-3.0.3-120.el5_6.2.x86_64.rpm xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm xen-debuginfo-3.0.3-120.el5_6.2.x86_64.rpm xen-devel-3.0.3-120.el5_6.2.i386.rpm xen-devel-3.0.3-120.el5_6.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/...

i386: xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm xen-libs-3.0.3-120.el5_6.2.i386.rpm

ia64: xen-debuginfo-3.0.3-120.el5_6.2.ia64.rpm xen-libs-3.0.3-120.el5_6.2.ia64.rpm

x86_64: xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm xen-debuginfo-3.0.3-120.el5_6.2.x86_64.rpm xen-libs-3.0.3-120.el5_6.2.i386.rpm xen-libs-3.0.3-120.el5_6.2.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/...

i386: xen-3.0.3-120.el5_6.2.i386.rpm xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm xen-devel-3.0.3-120.el5_6.2.i386.rpm

ia64: xen-3.0.3-120.el5_6.2.ia64.rpm xen-debuginfo-3.0.3-120.el5_6.2.ia64.rpm xen-devel-3.0.3-120.el5_6.2.ia64.rpm

x86_64: xen-3.0.3-120.el5_6.2.x86_64.rpm xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm xen-debuginfo-3.0.3-120.el5_6.2.x86_64.rpm xen-devel-3.0.3-120.el5_6.2.i386.rpm xen-devel-3.0.3-120.el5_6.2.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/#package

References:

https://www.redhat.com/security/data/cve/CVE-2011-1583.html https://access.redhat.com/security/updates/classification...

Contact:

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

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