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Security Advisory Moderate: xen security and bug fix update

Advisory: RHSA-2011:1401-1
Type: Security Advisory
Severity: Moderate
Issued on: 2011-10-24
Last updated on: 2011-10-24
Affected Products: RHEL Desktop Multi OS (v. 5 client)
RHEL Virtualization (v. 5 server)
Red Hat Enterprise Linux (v. 5 server)
Red Hat Enterprise Linux Desktop (v. 5 client)
CVEs (cve.mitre.org): CVE-2011-3346

Details

Updated xen packages that fix one security issue and three bugs are now
available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team 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.

The xen packages contain administration tools and the xend service for
managing the kernel-xen kernel for virtualization on Red Hat Enterprise
Linux.

A buffer overflow flaw was found in the Xen hypervisor SCSI subsystem
emulation. An unprivileged, local guest user could provide a large number
of bytes that are used to zero out a fixed-sized buffer via a SAI READ
CAPACITY SCSI command, overwriting memory and causing the guest to crash.
(CVE-2011-3346)

This update also fixes the following bugs:

* Prior to this update, the vif-bridge script used a maximum transmission
unit (MTU) of 1500 for a new Virtual Interface (VIF). As a result, the MTU
of the VIF could differ from that of the target bridge. This update fixes
the VIF hot-plug script so that the default MTU for new VIFs will match
that of the target Xen hypervisor bridge. In combination with a new enough
kernel (RHSA-2011:1386), this enables the use of jumbo frames in Xen
hypervisor guests. (BZ#738608)

* Prior to this update, the network-bridge script set the MTU of the bridge
to 1500. As a result, the MTU of the Xen hypervisor bridge could differ
from that of the physical interface. This update fixes the network script
so the MTU of the bridge can be set higher than 1500, thus also providing
support for jumbo frames. Now, the MTU of the Xen hypervisor bridge will
match that of the physical interface. (BZ#738610)

* Red Hat Enterprise Linux 5.6 introduced an optimized migration handling
that speeds up the migration of guests with large memory. However, the new
migration procedure can theoretically cause data corruption. While no cases
were observed in practice, with this update, the xend daemon properly waits
for correct device release before the guest is started on a destination
machine, thus fixing this bug. (BZ#743850)

Note: Before a guest is using a new enough kernel (RHSA-2011:1386), the MTU
of the VIF will drop back to 1500 (if it was set higher) after migration.

All xen users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing the
updated packages, the xend service must be restarted for this update to
take effect.


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

Updated packages

RHEL Desktop Multi OS (v. 5 client)

SRPMS:
xen-3.0.3-132.el5_7.2.src.rpm
File outdated by:  RHBA-2013:0846
    MD5: 33211df50ebdba40e654aecaccf7aeed
SHA-256: f80d934f64886e0fad296b335f2061a708e66430ca23ed375b51ce6569d3caa3
 
IA-32:
xen-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: 9697413180f3e367de72e2a55546fbd4
SHA-256: 4d3b24cca61261477b328a71703a26748a0f209eed47d8e428ca215d4c083c62
xen-devel-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: 8158e0d7d3496dfae64295fad8209559
SHA-256: 9f60cb2ceee8e1e5ce66c561bc21340c2235050b7c8eb6dce25448e90fbd12d2
 
x86_64:
xen-3.0.3-132.el5_7.2.x86_64.rpm
File outdated by:  RHBA-2013:0846
    MD5: 3a218fe67c19c343d1380d9779a837c0
SHA-256: 0b867ef119ca5f19af54c7e7db186633629a3b25943f0b2e27a863fc0731f739
xen-devel-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: 8158e0d7d3496dfae64295fad8209559
SHA-256: 9f60cb2ceee8e1e5ce66c561bc21340c2235050b7c8eb6dce25448e90fbd12d2
xen-devel-3.0.3-132.el5_7.2.x86_64.rpm
File outdated by:  RHBA-2013:0846
    MD5: 079eacd0d5cc39c6e512595caa203393
SHA-256: 31f90aa0387206b83fd64360074e093161d4d8bd6c87a6081147a3f1d39230bd
 
RHEL Virtualization (v. 5 server)

SRPMS:
xen-3.0.3-132.el5_7.2.src.rpm
File outdated by:  RHBA-2013:0846
    MD5: 33211df50ebdba40e654aecaccf7aeed
SHA-256: f80d934f64886e0fad296b335f2061a708e66430ca23ed375b51ce6569d3caa3
 
IA-32:
xen-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: 9697413180f3e367de72e2a55546fbd4
SHA-256: 4d3b24cca61261477b328a71703a26748a0f209eed47d8e428ca215d4c083c62
xen-devel-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: 8158e0d7d3496dfae64295fad8209559
SHA-256: 9f60cb2ceee8e1e5ce66c561bc21340c2235050b7c8eb6dce25448e90fbd12d2
 
IA-64:
xen-3.0.3-132.el5_7.2.ia64.rpm
File outdated by:  RHBA-2013:0846
    MD5: f679ecc0eb27c415b9f44a7ccfb5238f
SHA-256: 886b7f4883dbd3df6a1409864e7af39a2c9d6eaf89c8e4348f7256898847e594
xen-devel-3.0.3-132.el5_7.2.ia64.rpm
File outdated by:  RHBA-2013:0846
    MD5: fd5ae58e86ba1f710c1e0012ffdd2d1a
SHA-256: 5e4df7ba83e1fdecf4f830531ad2171d416689b36802ee80589ec1b53c2bf3b4
 
x86_64:
xen-3.0.3-132.el5_7.2.x86_64.rpm
File outdated by:  RHBA-2013:0846
    MD5: 3a218fe67c19c343d1380d9779a837c0
SHA-256: 0b867ef119ca5f19af54c7e7db186633629a3b25943f0b2e27a863fc0731f739
xen-devel-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: 8158e0d7d3496dfae64295fad8209559
SHA-256: 9f60cb2ceee8e1e5ce66c561bc21340c2235050b7c8eb6dce25448e90fbd12d2
xen-devel-3.0.3-132.el5_7.2.x86_64.rpm
File outdated by:  RHBA-2013:0846
    MD5: 079eacd0d5cc39c6e512595caa203393
SHA-256: 31f90aa0387206b83fd64360074e093161d4d8bd6c87a6081147a3f1d39230bd
 
Red Hat Enterprise Linux (v. 5 server)

SRPMS:
xen-3.0.3-132.el5_7.2.src.rpm
File outdated by:  RHBA-2013:0846
    MD5: 33211df50ebdba40e654aecaccf7aeed
SHA-256: f80d934f64886e0fad296b335f2061a708e66430ca23ed375b51ce6569d3caa3
 
IA-32:
xen-libs-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: e49b88766e61de0658a71dc5d129fb89
SHA-256: 4317461c1200696ac121bc8addc94de32b1622170ec1a13880f10d9a00399a06
 
IA-64:
xen-libs-3.0.3-132.el5_7.2.ia64.rpm
File outdated by:  RHBA-2013:0846
    MD5: 542a13e09e937d6ea597cd9e45044701
SHA-256: c5c5faaa7371787b76797f8fbd7b71657fb94269258dd048f8550aa84fbe4be1
 
x86_64:
xen-libs-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: e49b88766e61de0658a71dc5d129fb89
SHA-256: 4317461c1200696ac121bc8addc94de32b1622170ec1a13880f10d9a00399a06
xen-libs-3.0.3-132.el5_7.2.x86_64.rpm
File outdated by:  RHBA-2013:0846
    MD5: d6a86087c019276d5c35fbf20f3136dd
SHA-256: 7ab489d933145415c08ab3648a4d3ba55f6055a5bdaf746975c6d6c76bf1cd3b
 
Red Hat Enterprise Linux Desktop (v. 5 client)

SRPMS:
xen-3.0.3-132.el5_7.2.src.rpm
File outdated by:  RHBA-2013:0846
    MD5: 33211df50ebdba40e654aecaccf7aeed
SHA-256: f80d934f64886e0fad296b335f2061a708e66430ca23ed375b51ce6569d3caa3
 
IA-32:
xen-libs-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: e49b88766e61de0658a71dc5d129fb89
SHA-256: 4317461c1200696ac121bc8addc94de32b1622170ec1a13880f10d9a00399a06
 
x86_64:
xen-libs-3.0.3-132.el5_7.2.i386.rpm
File outdated by:  RHBA-2013:0846
    MD5: e49b88766e61de0658a71dc5d129fb89
SHA-256: 4317461c1200696ac121bc8addc94de32b1622170ec1a13880f10d9a00399a06
xen-libs-3.0.3-132.el5_7.2.x86_64.rpm
File outdated by:  RHBA-2013:0846
    MD5: d6a86087c019276d5c35fbf20f3136dd
SHA-256: 7ab489d933145415c08ab3648a4d3ba55f6055a5bdaf746975c6d6c76bf1cd3b
 
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

736038 - CVE-2011-3346 qemu: local DoS with SCSI CD-ROM
738608 - vif (netback) should take its default MTU from the bridge
738610 - The network-bridge script does not set the MTU of the bridge to match the MTU of the physical interface


References



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

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/