Test ID:	1.3.6.1.4.1.25623.1.0.881026
Category:	CentOS Local Security Checks
Title:	CentOS Update for xen CESA-2011:1401 centos5 i386
Summary:	The remote host is missing an update for the 'xen'; package(s) announced via the referenced advisory.
Description:	Summary: The remote host is missing an update for the 'xen' package(s) announced via the referenced advisory. Vulnerability Insight: 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. Affected Software/OS: xen on CentOS 5 Solution: Please install the updated packages. CVSS Score: 4.0 CVSS Vector: AV:L/AC:H/Au:N/C:N/I:N/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2011-3346 RHSA-2011:1401 http://www.redhat.com/support/errata/RHSA-2011-1401.html [oss-security] 20111020 qemu: CVE-2011-3346 http://www.openwall.com/lists/oss-security/2011/10/20/2 http://git.qemu.org/?p=qemu-stable-0.15.git%3Ba=log https://bugzilla.redhat.com/show_bug.cgi?id=736038 https://github.com/bonzini/qemu/commit/103b40f51e4012b3b0ad20f615562a1806d7f49a https://github.com/bonzini/qemu/commit/7285477ab11831b1cf56e45878a89170dd06d9b9
Copyright	Copyright (C) 2011 Greenbone AG

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