QEMU 0.9.0 does not properly handle changes to removable media, which allows guest OS users to read arbitrary files on the host OS by using the diskformat: parameter in the -usbdevice option to modify the disk-image header to identify a different format, a related issue to CVE-2008-2004.

The remote MiracleLinux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2008-443:02 advisory.

    This package contains the Xen tools and management daemons needed to run virtual machines.
    Information on how to use Xen can be found at the Xen project pages.
    The Xen system also requires the Xen hypervisor and domain-0 kernel, which can be found in the kernel-xen*     package.
    Virtualization can be used to run multiple operating systems on one physical system, for purposes of     hardware consolidation, hardware abstraction, or to test untrusted applications in a sandboxed     environment.
    Bugs fixed:
    CVE-2007-4993     pygrub (tools/pygrub/src/GrubConf.py) in Xen 3.0.3, when booting a guest domain, allows local users with     elevated privileges in the guest domain to execute arbitrary commands in domain 0 via a crafted grub.conf     file whose contents are used in exec statements.
    CVE-2007-1321     Integer signedness error in the NE2000 emulator in QEMU 0.8.2, as used in Xen and possibly other products,     allows local users to trigger a heap-based buffer overflow via certain register values that bypass sanity     checks, aka QEMU NE2000 receive integer signedness error. NOTE: this identifier was inadvertently used     by some sources to cover multiple issues that were labeled NE2000 network driver and the socket code,     but separate identifiers have been created for the individual vulnerabilities since there are sometimes     different fixes; see CVE-2007-5729 and CVE-2007-5730.
    CVE-2007-3919     (1) xenbaked and (2) xenmon.py in Xen 3.1 and earlier allow local users to truncate arbitrary files via a     symlink attack on /tmp/xenq-shm.
    CVE-2008-0928     Qemu 0.9.1 and earlier does not perform range checks for block device read or write requests, which allows     guest host users with root privileges to access arbitrary memory and escape the virtual machine.
    CVE-2007-5730     Heap-based buffer overflow in QEMU 0.8.2, as used in Xen and possibly other products, allows local users     to execute arbitrary code via crafted data in the net socket listen option, aka QEMU net socket heap     overflow. NOTE: some sources have used CVE-2007-1321 to refer to this issue as part of NE2000 network     driver and the socket code, but this is the correct identifier for the individual net socket listen     vulnerability.
    CVE-2008-2004     The drive_init function in QEMU 0.9.1 determines the format of a raw disk image based on the header, which     allows local guest users to read arbitrary files on the host by modifying the header to identify a     different format, which is used when the guest is restarted.
    CVE-2008-1945     QEMU 0.9.0 does not properly handle changes to removable media, which allows guest OS users to read     arbitrary files on the host OS by using the diskformat: parameter in the -usbdevice option to modify the     disk-image header to identify a different format, a related issue to CVE-2008-2004.
    CVE-2008-1952     The backend for XenSource Xen Para Virtualized Frame Buffer (PVFB) in Xen ioemu does not properly restrict     the frame buffer size, which allows attackers to cause a denial of service (crash) by mapping an arbitrary     amount of guest memory.
    - rebuild for Asianux 3.0 SP1
    - use functions for service script xendomains by default
    - Fix PVFB to validate frame buffer description
    - Fix PVFB to cope with bogus update requests
    - Fix FV O_DIRECT flushing
    - Rewrite locking in hotplug scripts to fix timeouts
    - Require xen-hypervisor-abi = 3.1 to pull in neccessary kernel
    - Fixed memory ballooning for HVM restore
    - Avoid bogus VNC password prompts after migrate/restore
    - Fix UUID normalization when no UUID is present
    - Fix handling of 'keymap' param in config files
    - Don't destroy guest after shutdown timeout
    - Ensure PVFB daemon terminates promptly on domain shutdown
    - Fix rtl8139 checksums for VISTA
    - Update package description to better reflect reality
    - Fix more VNC threading problems
    - Fix save/restore edge case
    - Fix legacy PVFB for 32-on-64
    - Fixed booting guests with legacy native ABI device protocol
    - Fix more VNC keycode/keysym mappings issues
    - Fix potential QEMU crash when VNC client disconnects
    - Add NVRAM support for ia64 guests
    - Normalize UUID to avoid loosing guest name upon restarts
    - fix ethernet bonding in balanced-rr mode
    - Fix vncport type cast for HVM guests
    - Ignore failures in dump core
    - Rate limit console messages from guest
    - Use -r flag to losetup for readonly block devices
    - Mark /etc/sysconfig/xend as a config file
    - Fix address test in network-bridge
    - Permissions of xend-debug.log
    - Hotplug scripts error reporting
    - Disable network-bridge if running on Dom0 with nfs/iscsi root device
    - Fix a race in the pvfb startup
    - Loadable pvfb keymap
    - Fix pvfb save/restore broken in 3.0.3-27.el5
    - Fixed 32-bit core dumps with HVM
    - Add persistent logging of guest & hypervisor console
    - Fix destroyDevice() args
    - Check file exists in blktap hotplug scripts
    - Make SXPR server in XenD multi-threaded
    - Fixed xm man page about block device modes
    - Update low level (non-XenD) userspace to work with 3.1.0 hypervisor
    - Patch XenD to use 'domid' instead of 'dom' with libxc
    - Patch XenD to use new HVM domain creation process
    - Remove unused i18n stuff from Makefile
    - Fix pygrub, blktapctrl paths to return to original settings
    - Back-port 3.1.0 HVM save/restore changes to XenD
    - Move HVM save/restore files from /tmp to /var/lib/xen
    - Ensure pvfb backend terminates when frontend vanishes early
    - Save vncpasswd in xenstore along with the other pvfb configuration
    - Fix allocation of fixed VNC ports for pvfb
    - Don't start a xen-vncfb process for HVM
    - disable qemu monitor mode, for security reasons
    - fix IA64 shadow page table mode

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2008-458:03 advisory.

    The xen packages contain tools for managing the virtual machine monitor     Bugs fixed:
    CVE-2008-1945     QEMU 0.9.0 does not properly handle changes to removable media, which allows guest OS users to read     arbitrary files on the host OS by using the diskformat: parameter in the -usbdevice option to modify the     disk-image header to identify a different format, a related issue to CVE-2008-2004.
    CVE-2008-1952     The backend for XenSource Xen Para Virtualized Frame Buffer (PVFB) in Xen ioemu does not properly restrict     the frame buffer size, which allows attackers to cause a denial of service (crash) by mapping an arbitrary     amount of guest memory.

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - CVE-2008-1945: add image format options for USB storage     and removable media

  - CVE-2008-1952: included in fix for CVE-2008-1943     (3.1.4-0.1.3.el5)

The remote Oracle Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2008-0892 advisory.

    - Correctly limit PVFB size CVE-2008-1952 (rhbz #447760)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It was discovered that the hypervisor's para-virtualized framebuffer (PVFB) backend failed to validate the frontend's framebuffer description properly. This could allow a privileged user in the unprivileged domain (DomU) to cause a denial of service, or, possibly, elevate privileges to the privileged domain (Dom0). (CVE-2008-1952)

A flaw was found in the QEMU block format auto-detection, when running fully-virtualized guests and using Qemu images written on removable media (USB storage, 3.5' disks). Privileged users of such fully-virtualized guests (DomU), with a raw-formatted disk image, were able to write a header to that disk image describing another format.
This could allow such guests to read arbitrary files in their hypervisor's host (Dom0). (CVE-2008-1945)

Additionally, the following bug is addressed in this update :

  - The qcow-create command terminated when invoked due to     glibc bounds checking on the realpath() function.

Updated xen packages that resolve a couple of security issues and fix a bug are now available for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red Hat Security Response Team.

The xen packages contain tools for managing the virtual machine monitor in Red Hat Virtualization.

It was discovered that the hypervisor's para-virtualized framebuffer (PVFB) backend failed to validate the frontend's framebuffer description properly. This could allow a privileged user in the unprivileged domain (DomU) to cause a denial of service, or, possibly, elevate privileges to the privileged domain (Dom0). (CVE-2008-1952)

A flaw was found in the QEMU block format auto-detection, when running fully-virtualized guests and using Qemu images written on removable media (USB storage, 3.5' disks). Privileged users of such fully-virtualized guests (DomU), with a raw-formatted disk image, were able to write a header to that disk image describing another format.
This could allow such guests to read arbitrary files in their hypervisor's host (Dom0). (CVE-2008-1945)

Additionally, the following bug is addressed in this update :

* The qcow-create command terminated when invoked due to glibc bounds checking on the realpath() function.

Users of xen are advised to upgrade to these updated packages, which resolve these security issues and fix this bug.

qemu update to version 0.10.1 fixes the following security issues :

CVE-2008-0928: problems with range checks of block devices CVE-2008-1945: problems with removable media handling CVE-2008-2382:
vnc server DoS CVE-2008-4539: fix a heap overflow in the cirrus VGA implementation CVE-2008-5714: off by one error in vnc password handling

USN-776-1 fixed vulnerabilities in KVM. Due to an incorrect fix, a regression was introduced in Ubuntu 8.04 LTS that caused KVM to fail to boot virtual machines started via libvirt. This update fixes the problem. We apologize for the inconvenience.

Avi Kivity discovered that KVM did not correctly handle certain disk formats. A local attacker could attach a malicious partition that would allow the guest VM to read files on the VM host. (CVE-2008-1945, CVE-2008-2004)

Alfredo Ortega discovered that KVM's VNC protocol handler did not correctly validate certain messages. A remote attacker could send specially crafted VNC messages that would cause KVM to consume CPU resources, leading to a denial of service. (CVE-2008-2382)

Jan Niehusmann discovered that KVM's Cirrus VGA implementation over VNC did not correctly handle certain bitblt operations. A local attacker could exploit this flaw to potentially execute arbitrary code on the VM host or crash KVM, leading to a denial of service. (CVE-2008-4539)

It was discovered that KVM's VNC password checks did not use the correct length. A remote attacker could exploit this flaw to cause KVM to crash, leading to a denial of service.
(CVE-2008-5714).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Avi Kivity discovered that KVM did not correctly handle certain disk formats. A local attacker could attach a malicious partition that would allow the guest VM to read files on the VM host. (CVE-2008-1945, CVE-2008-2004)

Alfredo Ortega discovered that KVM's VNC protocol handler did not correctly validate certain messages. A remote attacker could send specially crafted VNC messages that would cause KVM to consume CPU resources, leading to a denial of service. (CVE-2008-2382)

Jan Niehusmann discovered that KVM's Cirrus VGA implementation over VNC did not correctly handle certain bitblt operations. A local attacker could exploit this flaw to potentially execute arbitrary code on the VM host or crash KVM, leading to a denial of service.
(CVE-2008-4539)

It was discovered that KVM's VNC password checks did not use the correct length. A remote attacker could exploit this flaw to cause KVM to crash, leading to a denial of service. (CVE-2008-5714).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities have been discovered in the QEMU processor emulator. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2008-0928     Ian Jackson discovered that range checks of file     operations on emulated disk devices were insufficiently     enforced.

  - CVE-2008-1945     It was discovered that an error in the format auto     detection of removable media could lead to the     disclosure of files in the host system.

  - CVE-2008-4539     A buffer overflow has been found in the emulation of the     Cirrus graphics adaptor.

Multiple vulnerabilities have been found in Qemu.

Multiple heap-based buffer overflows in the cirrus_invalidate_region function in the Cirrus VGA extension in QEMU 0.8.2, as used in Xen and possibly other products, might allow local users to execute arbitrary code via unspecified vectors related to attempting to mark non-existent regions as dirty, aka the bitblt heap overflow.
(CVE-2007-1320)

Integer signedness error in the NE2000 emulator in QEMU 0.8.2, as used in Xen and possibly other products, allows local users to trigger a heap-based buffer overflow via certain register values that bypass sanity checks, aka QEMU NE2000 receive integer signedness error.
(CVE-2007-1321)

QEMU 0.8.2 allows local users to halt a virtual machine by executing the icebp instruction. (CVE-2007-1322)

QEMU 0.8.2 allows local users to crash a virtual machine via the divisor operand to the aam instruction, as demonstrated by aam 0x0, which triggers a divide-by-zero error. (CVE-2007-1366)

The NE2000 emulator in QEMU 0.8.2 allows local users to execute arbitrary code by writing Ethernet frames with a size larger than the MTU to the EN0_TCNT register, which triggers a heap-based buffer overflow in the slirp library, aka NE2000 mtu heap overflow.
(CVE-2007-5729)

Heap-based buffer overflow in QEMU 0.8.2, as used in Xen and possibly other products, allows local users to execute arbitrary code via crafted data in the net socket listen option, aka QEMU net socket heap overflow. (CVE-2007-5730)

QEMU 0.9.0 allows local users of a Windows XP SP2 guest operating system to overwrite the TranslationBlock (code_gen_buffer) buffer, and probably have unspecified other impacts related to an overflow, via certain Windows executable programs, as demonstrated by qemu-dos.com.
(CVE-2007-6227)

Qemu 0.9.1 and earlier does not perform range checks for block device read or write requests, which allows guest host users with root privileges to access arbitrary memory and escape the virtual machine.
(CVE-2008-0928)

Changing removable media in QEMU could trigger a bug similar to CVE-2008-2004, which would allow local guest users to read arbitrary files on the host by modifying the header of the image to identify a different format. (CVE-2008-1945) See the diskformat: parameter to the
-usbdevice option.

The drive_init function in QEMU 0.9.1 determines the format of a raw disk image based on the header, which allows local guest users to read arbitrary files on the host by modifying the header to identify a different format, which is used when the guest is restarted.
(CVE-2008-2004) See the -format option.

The updated packages have been patched to fix these issues.

ID	Name	Product	Family	Type	Severity
284476	MiracleLinux 3 : xen-3.0.3-64.3.1AXS3 (AXSA:2008-443:02)	Nessus	Miracle Linux Local Security Checks	Local	high
284026	MiracleLinux 3 : xen-3.0.3-64.3.1AXS3 (AXSA:2008-458:03)	Nessus	Miracle Linux Local Security Checks	Local	high
79449	OracleVM 2.1 : xen (OVMSA-2008-2007)	Nessus	OracleVM Local Security Checks	Local	medium
67749	Oracle Linux 5 : xen (ELSA-2008-0892)	Nessus	Oracle Linux Local Security Checks	Local	high
60480	Scientific Linux Security Update : xen on SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	Local	medium
43711	CentOS 5 : xen (CESA-2008:0892)	Nessus	CentOS Local Security Checks	Local	medium
40302	openSUSE Security Update : qemu (qemu-691)	Nessus	SuSE Local Security Checks	Local	high
40118	openSUSE Security Update : qemu (qemu-691)	Nessus	SuSE Local Security Checks	Local	high
38777	Ubuntu 8.04 LTS : kvm regression (USN-776-2)	Nessus	Ubuntu Local Security Checks	Local	high
38759	Ubuntu 8.04 LTS / 8.10 : kvm vulnerabilities (USN-776-1)	Nessus	Ubuntu Local Security Checks	Local	high
38747	Debian DSA-1799-1 : qemu - several vulnerabilities	Nessus	Debian Local Security Checks	Local	high
37509	Mandriva Linux Security Advisory : qemu (MDVSA-2008:162)	Nessus	Mandriva Local Security Checks	Local	high
36082	openSUSE 10 Security Update : qemu (qemu-6123)	Nessus	SuSE Local Security Checks	Local	high
34329	RHEL 5 : xen (RHSA-2008:0892)	Nessus	Red Hat Local Security Checks	Local	medium

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CVE-2008-1945

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