The Debian Security Team reports :

Several vulnerabilities have been discovered in the QEMU processor emulator, which may lead to the execution of arbitrary code or denial of service. The Common Vulnerabilities and Exposures project identifies the following problems :

CVE-2007-1320Tavis Ormandy discovered that a memory management routine of the Cirrus video driver performs insufficient bounds checking, which might allow the execution of arbitrary code through a heap overflow.

CVE-2007-1321Tavis Ormandy discovered that the NE2000 network driver and the socket code perform insufficient input validation, which might allow the execution of arbitrary code through a heap overflow.

CVE-2007-1322Tavis Ormandy discovered that the 'icebp' instruction can be abused to terminate the emulation, resulting in denial of service.

CVE-2007-1323Tavis Ormandy discovered that the NE2000 network driver and the socket code perform insufficient input validation, which might allow the execution of arbitrary code through a heap overflow.

CVE-2007-1366Tavis Ormandy discovered that the 'aam' instruction can be abused to crash qemu through a division by zero, resulting in denial of service.

Fixes a security flaw in pygrub handling of config files and a denial-of-service case in ne2k NIC for QEMU.

Fixes the case of disappearing network cards in fully-virtualized guests. NB, it only fixes it for guests created after this errata is installed & XenD restarted. Any pre-existing guests may continue to have problems. To fix existing guests, first ensure XenD has been restarted (service xend restart), then use virt-manager/virsh to remove the network card, and then add it back. This will correct the configuration stored in XenD permanently.

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

An updated Xen package to fix multiple security issues is 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 package contains the tools for managing the virtual machine monitor in Red Hat Enterprise Linux virtualization.

The following security flaws are fixed in the updated Xen package :

Joris van Rantwijk found a flaw in the Pygrub utility which is used as a boot loader for guest domains. A malicious local administrator of a guest domain could create a carefully crafted grub.conf file which would trigger the execution of arbitrary code outside of that domain.
(CVE-2007-4993)

Tavis Ormandy discovered a heap overflow flaw during video-to-video copy operations in the Cirrus VGA extension code used in Xen. A malicious local administrator of a guest domain could potentially trigger this flaw and execute arbitrary code outside of the domain.
(CVE-2007-1320)

Tavis Ormandy discovered insufficient input validation leading to a heap overflow in the Xen NE2000 network driver. If the driver is in use, a malicious local administrator of a guest domain could potentially trigger this flaw and execute arbitrary code outside of the domain. Xen does not use this driver by default. (CVE-2007-1321)

Users of Xen should update to these erratum packages containing backported patches which correct these issues.

Detail :

Joris van Rantwijk found a flaw in the Pygrub utility which is used as a boot loader for guest domains. A malicious local administrator of a guest domain could create a carefully crafted grub.conf file which would trigger the execution of arbitrary code outside of that domain.
(CVE-2007-4993)

Tavis Ormandy discovered a heap overflow flaw during video-to-video copy operations in the Cirrus VGA extension code used in Xen. A malicious local administrator of a guest domain could potentially trigger this flaw and execute arbitrary code outside of the domain.
(CVE-2007-1320)

Tavis Ormandy discovered insufficient input validation leading to a heap overflow in the Xen NE2000 network driver. If the driver is in use, a malicious local administrator of a guest domain could potentially trigger this flaw and execute arbitrary code outside of the domain. Xen does not use this driver by default. (CVE-2007-1321)

- Fri Oct 26 2007 Daniel P. Berrange <berrange at     redhat.com> - 3.1.0-8.fc7

    - Fixed xenbaked tmpfile flaw (CVE-2007-3919)

    - Wed Sep 26 2007 Daniel P. Berrange <berrange at       redhat.com> - 3.1.0-7.fc7

    - Fixed rtl8139 checksum calculation for Vista (rhbz       #308201)

    - Wed Sep 26 2007 Chris Lalancette <clalance at       redhat.com> - 3.1.0-6.fc7

    - QEmu NE2000 overflow check - CVE-2007-1321

    - Pygrub guest escape - CVE-2007-4993

    - Mon Sep 24 2007 Daniel P. Berrange <berrange at       redhat.com> - 3.1.0-5.fc7

    - Fix generation of manual pages (rhbz #250791)

    - Fix 32-on-64 PVFB for FC6 legacy guests

    - Mon Sep 24 2007 Daniel P. Berrange <berrange at       redhat.com> - 3.1.0-4.fc7

    - Fix VMX assist IRQ handling (rhbz #279581)

    - Sun Sep 23 2007 Daniel P. Berrange <berrange at       redhat.com> - 3.1.0-3.fc7

    - Don't clobber the VIF type attribute in FV guests       (rhbz #247122)

    - Wed Aug 1 2007 Markus Armbruster <armbru at       redhat.com>

    - Put guest's native protocol ABI into xenstore, to       provide for older kernels running 32-on-64.

  - VNC keymap fixes

    - Fix race conditions in LibVNCServer on client       disconnect

    - Mon Jun 11 2007 Daniel P. Berrange <berrange at       redhat.com> - 3.1.0-2.fc7

    - Remove patch which kills VNC monitor

    - Fix HVM save/restore file path to be /var/lib/xen       instead of /tmp

    - Don't spawn a bogus xen-vncfb daemon for HVM guests

    - Fri May 25 2007 Daniel P. Berrange <berrange at       redhat.com> - 3.1.0-1.fc7

    - Updated to official 3.1.0 tar.gz

    - Fixed data corruption from VNC client disconnect (bz       241303)

    - Thu May 17 2007 Daniel P. Berrange <berrange at       redhat.com> - 3.1.0-0.rc7.2.fc7

    - Ensure xen-vncfb processes are cleanedup if guest       quits (bz 240406)

    - Tear down guest if device hotplug fails

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

From Red Hat Security Advisory 2007:0323 :

An updated Xen package to fix multiple security issues is 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 package contains the tools for managing the virtual machine monitor in Red Hat Enterprise Linux virtualization.

The following security flaws are fixed in the updated Xen package :

Joris van Rantwijk found a flaw in the Pygrub utility which is used as a boot loader for guest domains. A malicious local administrator of a guest domain could create a carefully crafted grub.conf file which would trigger the execution of arbitrary code outside of that domain.
(CVE-2007-4993)

Tavis Ormandy discovered a heap overflow flaw during video-to-video copy operations in the Cirrus VGA extension code used in Xen. A malicious local administrator of a guest domain could potentially trigger this flaw and execute arbitrary code outside of the domain.
(CVE-2007-1320)

Tavis Ormandy discovered insufficient input validation leading to a heap overflow in the Xen NE2000 network driver. If the driver is in use, a malicious local administrator of a guest domain could potentially trigger this flaw and execute arbitrary code outside of the domain. Xen does not use this driver by default. (CVE-2007-1321)

Users of Xen should update to these erratum packages containing backported patches which correct these issues.

Several vulnerabilities have been discovered in the QEMU processor emulator, which may lead to the execution of arbitrary code or denial of service. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2007-1320     Tavis Ormandy discovered that a memory management     routine of the Cirrus video driver performs insufficient     bounds checking, which might allow the execution of     arbitrary code through a heap overflow.

  - CVE-2007-1321     Tavis Ormandy discovered that the NE2000 network driver     and the socket code perform insufficient input     validation, which might allow the execution of arbitrary     code through a heap overflow.

  - CVE-2007-1322     Tavis Ormandy discovered that the 'icebp' instruction     can be abused to terminate the emulation, resulting in     denial of service.

  - CVE-2007-1323     Tavis Ormandy discovered that the NE2000 network driver     and the socket code perform insufficient input     validation, which might allow the execution of arbitrary     code through a heap overflow.

  - CVE-2007-1366     Tavis Ormandy discovered that the 'aam' instruction can     be abused to crash qemu through a division by zero,     resulting in denial of service.

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.

Fixes a security flaw in pygrub handling of config files and a denial-of-service case in ne2k NIC for QEMU.

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

Tavis Ormandy discovered a heap overflow flaw during video-to-video copy operations in the Cirrus VGA extension code that is used in Xen.
A malicious local administrator of a guest domain could potentially trigger this flaw and execute arbitrary code outside of the domain (CVE-2007-1320).

Tavis Ormandy also discovered insufficient input validation leading to a heap overflow in the NE2000 network driver in Xen. If the driver is in use, a malicious local administrator of a guest domain could potentially trigger this flaw and execute arbitrary code outside of the domain (CVE-2007-1321, CVE-2007-5729, CVE-2007-5730).

Steve Kemp found that xen-utils used insecure temporary files within the xenmon tool that could allow local users to truncate arbitrary files (CVE-2007-3919).

Joris van Rantwijk discovered a flaw in Pygrub, which is used as a boot loader for guest domains. A malicious local administrator of a guest domain could create a carefully-crafted grub.conf file which could trigger the execution of arbitrary code outside of that domain (CVE-2007-4993).

Updated packages have been patched to prevent these issues.

ID	Name	Product	Family	Published	Updated	Severity
25129	FreeBSD : qemu -- several vulnerabilities (0ac89b39-f829-11db-b55c-000e0c6d38a9)	Nessus	FreeBSD Local Security Checks	5/2/2007	1/6/2021	high
27763	Fedora 7 : xen-3.1.0-6.fc7 (2007-2270)	Nessus	Fedora Local Security Checks	11/6/2007	1/11/2021	medium
26903	RHEL 5 : xen (RHSA-2007:0323)	Nessus	Red Hat Local Security Checks	10/3/2007	1/14/2021	high
60261	Scientific Linux Security Update : xen on SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	8/1/2012	1/14/2021	high
27794	Fedora 7 : xen-3.1.0-8.fc7 (2007-2708)	Nessus	Fedora Local Security Checks	11/6/2007	1/11/2021	medium
67486	Oracle Linux 5 : xen (ELSA-2007-0323)	Nessus	Oracle Linux Local Security Checks	7/12/2013	1/14/2021	high
43639	CentOS 5 : xen (CESA-2007:0323)	Nessus	CentOS Local Security Checks	1/6/2010	1/4/2021	high
25151	Debian DSA-1284-1 : qemu - several vulnerabilities	Nessus	Debian Local Security Checks	5/3/2007	1/4/2021	high
37509	Mandriva Linux Security Advisory : qemu (MDVSA-2008:162)	Nessus	Mandriva Local Security Checks	4/23/2009	1/6/2021	high
26933	Fedora Core 6 : xen-3.0.3-12.fc6 (2007-713)	Nessus	Fedora Local Security Checks	10/9/2007	1/11/2021	high
27614	Mandrake Linux Security Advisory : xen (MDKSA-2007:203)	Nessus	Mandriva Local Security Checks	11/2/2007	1/6/2021	high

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