Author Archives: jbeulich

Xen Project 4.5.5 Maintenance Release is Available

I am pleased to announce the release of Xen 4.5.5. Xen Project Maintenance releases are released in line with our Maintenance Release Policy. We recommend that all users of the 4.5 stable series update to this point release.

Xen 4.5.5 is available immediately from its git repository:

    xenbits.xenproject.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.5
    (tag RELEASE-4.5.5)

or from the Xen Project download page at www.xenproject.org/downloads/xen-archives/xen-45-series/xen-455.html.

This release contains many bug fixes and improvements. For a complete list of changes in this release, please check the lists of changes on the download page.

We recommend all users of the 4.5 stable series to update to this latest point release.

Xen Project 4.5.3 Maintenance Release is Available

I am pleased to announce the release of Xen 4.5.3. Xen Project Maintenance releases are released in line with our Maintenance Release Policy. We recommend that all users of the 4.5 stable series update to this point release.

Xen 4.5.3 is available immediately from its git repository:

    xenbits.xenproject.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.5
    (tag RELEASE-4.5.3)

or from the Xen Project download page at www.xenproject.org/downloads/xen-archives/xen-45-series/xen-453.html.

This release contains many bug fixes and improvements. For a complete list of changes in this release, please check the lists of changes on the download page.

We recommend all users of the 4.5 stable series to update to this latest point release.

Xen Project 4.6.1 Maintenance Release is Available

I am pleased to announce the release of Xen 4.6.1. Xen Project Maintenance releases are released in line with our Maintenance Release Policy: this means we make one new point release per stable series every 4 months, which include back-ports of bug-fixes and security issues.

I am pleased to announce the release of Xen 4.6.1. This is available immediately from its git repository

http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.6
(tag RELEASE-4.6.1)

or from the XenProject download page

http://www.xenproject.org/downloads/xen-archives/xen-46-series/xen-461.html
(where a list of changes can also be found).

Note that, as also mentioned on the web page above, due to two oversights the fixes for both XSA-155 and XSA-162 have only been partially applied to this release. (Note further that the same applies to the recently announced 4.4.4 release.)

We recommend all users of the 4.6 stable series to update to this first point release.

Additional note published Feb 17th: We detected the missing patches before the official release, but towards the end of the release process. We then had a discussion whether to make a new release which would have forced us to skip a release number (aka move from 4.6.0 to 4.6.1.1 or 4.6.2) or release 4.6.1 with two security patches which were incomplete, and document what is missing. At this point, we had to decide whether to re-tag (and thus re-number the release) or whether to document any issues. A similar issue happened in 2013, when we released Xen 4.1.6.1 instead of Xen 4.1.6. At that time it became clear that many consumers of Xen have difficulties with a version number that does not fit into the normal version numbering pattern, which led to Xen 4.1.6.1 not being widely used. We cannot re-spin a release without changing the version number if issues are discovered late during the release process. Firstly, making a release involves both extensive testing and also has a security dimension. Normally, after testing succeeds we create a signed tag in the git tree. This means that there is a secure way of accounting for where the tarball came from. We then rebuild and do additional testing, write the release notes, do some more checking and sign the tarballs. The missing patches were discovered on Thursday, before the official release on Monday, but after we created the signed tag. Signed tags cannot be removed, as they have to be tamper proof, which makes everyone more secure.

Xen Project Hypervisor versions 4.3.4 and 4.4.2 are available

I am pleased to announce the release of Xen 4.3.4 and Xen 4.4.2. Both releases are available immediately from their git repositories and download pages (see below). We recommend to all users of the 4.3 and 4.4 stable series to update to these latest point releases.

Xen 4.3.4

This release is available immediately from its git repository at
http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.3
(tag RELEASE-4.3.4) or from the XenProject download page.

Note that this is expected to be the last release of the 4.3 stable series. The tree will be switched to security only maintenance mode after this release.

This fixes the following critical vulnerabilities:

  • CVE-2014-5146, CVE-2014-5149 / XSA-97: Long latency virtual-mmu operations are not preemptible
  • CVE-2014-7154 / XSA-104: Race condition in HVMOP_track_dirty_vram
  • CVE-2014-7155 / XSA-105: Missing privilege level checks in x86 HLT, LGDT, LIDT, and LMSW emulation
  • CVE-2014-7156 / XSA-106: Missing privilege level checks in x86 emulation of software interrupts
  • CVE-2014-7188 / XSA-108: Improper MSR range used for x2APIC emulation
  • CVE-2014-8594 / XSA-109: Insufficient restrictions on certain MMU update hypercalls
  • CVE-2014-8595 / XSA-110: Missing privilege level checks in x86 emulation of far branches
  • CVE-2014-8866 / XSA-111: Excessive checking in compatibility mode hypercall argument translation
  • CVE-2014-8867 / XSA-112: Insufficient bounding of “REP MOVS” to MMIO emulated inside the hypervisor
  • CVE-2014-9030 / XSA-113: Guest effectable page reference leak in MMU_MACHPHYS_UPDATE handling
  • CVE-2014-9065, CVE-2014-9066 / XSA-114: p2m lock starvation
  • CVE-2015-0361 / XSA-116: xen crash due to use after free on hvm guest teardown
  • CVE-2015-1563 / XSA-118: arm: vgic: incorrect rate limiting of guest triggered logging
  • CVE-2015-2152 / XSA-119: HVM qemu unexpectedly enabling emulated VGA graphics backends
  • CVE-2015-2044 / XSA-121: Information leak via internal x86 system device emulation
  • CVE-2015-2045 / XSA-122: Information leak through version information hypercall
  • CVE-2015-2151 / XSA-123: Hypervisor memory corruption due to x86 emulator flaw

Additionally a bug in the fix for CVE-2014-3969 / CVE-2015-2290 / XSA-98 (which got assigned CVE-2015-2290) got addressed.

Sadly the workaround for CVE-2013-3495 / XSA-59 (Intel VT-d Interrupt Remapping engines can be evaded by native NMI interrupts) still can’t be guaranteed to cover all affected chipsets; Intel continues to be working on providing us with a complete list.

Apart from those there are many further bug fixes and improvements.

We recommend all users of the 4.3 stable series to update to this last point release.

Xen 4.4.2

This release is available immediately from its git repository at
http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.4
(tag RELEASE-4.4.2) or from the XenProject download page.

This fixes the following critical vulnerabilities:

  • CVE-2014-5146, CVE-2014-5149 / XSA-97: Long latency virtual-mmu operations are not preemptible
  • CVE-2014-7154 / XSA-104: Race condition in HVMOP_track_dirty_vram
  • CVE-2014-7155 / XSA-105: Missing privilege level checks in x86 HLT, LGDT, LIDT, and LMSW emulation
  • CVE-2014-7156 / XSA-106: Missing privilege level checks in x86 emulation of software interrupts
  • CVE-2014-6268 / XSA-107: Mishandling of uninitialised FIFO-based event channel control blocks
  • CVE-2014-7188 / XSA-108: Improper MSR range used for x2APIC emulation
  • CVE-2014-8594 / XSA-109: Insufficient restrictions on certain MMU update hypercalls
  • CVE-2014-8595 / XSA-110: Missing privilege level checks in x86 emulation of far branches
  • CVE-2014-8866 / XSA-111: Excessive checking in compatibility mode hypercall argument translation
  • CVE-2014-8867 / XSA-112: Insufficient bounding of “REP MOVS” to MMIO emulated inside the hypervisor
  • CVE-2014-9030 / XSA-113: Guest effectable page reference leak in MMU_MACHPHYS_UPDATE handling
  • CVE-2014-9065, CVE-2014-9066 / XSA-114: p2m lock starvation
  • CVE-2015-0361 / XSA-116: xen crash due to use after free on hvm guest teardown
  • CVE-2015-1563 / XSA-118: arm: vgic: incorrect rate limiting of guest triggered logging
  • CVE-2015-2152 / XSA-119: HVM qemu unexpectedly enabling emulated VGA graphics backends
  • CVE-2015-2044 / XSA-121: Information leak via internal x86 system device emulation
  • CVE-2015-2045 / XSA-122: Information leak through version information hypercall
  • CVE-2015-2151 / XSA-123: Hypervisor memory corruption due to x86 emulator flaw

Additionally a bug in the fix for CVE-2014-3969 / CVE-2015-2290 / XSA-98 (which got assigned CVE-2015-2290) got addressed.

Sadly the workaround for CVE-2013-3495 / XSA-59 (Intel VT-d Interrupt Remapping engines can be evaded by native NMI interrupts) still can’t be guaranteed to cover all affected chipsets; Intel continues to be working on providing us with a complete list.

Apart from those there are many further bug fixes and improvements.

We recommend all users of the 4.4 stable series to update to this first point release.

Xen Project Maintenance Releases Available (Versions 4.4.1, 4.3.3, 4.2.5)

I am pleased to announce the release of Xen 4.4.1, 4.3.3 and 4.2.5. We recommend that all users of the 4.4, 4.3 and 4.2 stable series update to the latest point release.

Xen 4.4.1

Xen 4.4.1 is available immediately from its git repository http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.4
(tag RELEASE-4.4.1) or from the XenProject download page http://www.xenproject.org/downloads/xen-archives/supported-xen-44-series/xen-441.html

This release fixes the following critical vulnerabilities:

  • CVE-2014-2599 / XSA-89: HVMOP_set_mem_access is not preemptible
  • CVE-2014-3125 / XSA-91: Hardware timer context is not properly context switched on ARM
  • CVE-2014-3124 / XSA-92: HVMOP_set_mem_type allows invalid P2M entries to be created
  • CVE-2014-2915 / XSA-93: Hardware features unintentionally exposed to guests on ARM
  • CVE-2014-2986 / XSA-94: ARM hypervisor crash on guest interrupt controller access
  • CVE-2014-3714,CVE-2014-3715,CVE-2014-3716,CVE-2014-3717 / XSA-95: input handling vulnerabilities loading guest kernel on ARM
  • CVE-2014-3967,CVE-2014-3968 / XSA-96: Vulnerabilities in HVM MSI injection
  • CVE-2014-3969 / XSA-98: insufficient permissions checks accessing guest memory on ARM
  • CVE-2014-4021 / XSA-100: Hypervisor heap contents leaked to guests
  • CVE-2014-4022 / XSA-101: information leak via gnttab_setup_table on ARM
  • CVE-2014-5147 / XSA-102: Flaws in handling traps from 32-bit userspace on 64-bit ARM
  • CVE-2014-5148 / XSA-103: Flaw in handling unknown system register access from 64-bit userspace on ARM

Additionally a workaround for CVE-2013-3495 / XSA-59 (Intel VT-d Interrupt Remapping engines can be evaded by native NMI interrupts) has been put in place. However, at this point we can’t guarantee that all affected chipsets are being covered; Intel is working diligently on providing us with a complete list.

Apart from those there are many further bug fixes and improvements.

Xen 4.3.3

Xen 4.3.3 is available immediately from its git repository http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.3 (tag RELEASE-4.3.3) or from the XenProject download page http://www.xenproject.org/downloads/xen-archives/supported-xen-43-series/xen-433.html

This fixes the following critical vulnerabilities:

  • CVE-2014-2599 / XSA-89: HVMOP_set_mem_access is not preemptible
  • CVE-2014-3124 / XSA-92: HVMOP_set_mem_type allows invalid P2M entries to be created
  • CVE-2014-3967,CVE-2014-3968 / XSA-96: Vulnerabilities in HVM MSI injection
  • CVE-2014-4021 / XSA-100: Hypervisor heap contents leaked to guests

Additionally a workaround for CVE-2013-3495 / XSA-59 (Intel VT-d Interrupt Remapping engines can be evaded by native NMI interrupts) has been put in place. However, at this point we can’t guarantee that all affected chipsets are being covered; Intel is working diligently on providing us with a complete list.

Apart from those there are many further bug fixes and improvements.

Xen 4.2.5

Xen 4.2.5 is available immediately from its git repository http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.2
(tag RELEASE-4.2.5) or from the XenProject download page http://www.xenproject.org/downloads/xen-archives/supported-xen-42-series/xen-425.html

Note that this is expected to be the last release of the 4.2 stable series. The tree will be switched to security only maintenance mode after this release.

This fixes the following critical vulnerabilities:

  • CVE-2014-2599 / XSA-89: HVMOP_set_mem_access is not preemptible
  • CVE-2014-3124 / XSA-92: HVMOP_set_mem_type allows invalid P2M entries to be created
  • CVE-2014-3967,CVE-2014-3968 / XSA-96: Vulnerabilities in HVM MSI injection
  • CVE-2014-4021 / XSA-100: Hypervisor heap contents leaked to guests

Apart from those there are many further bug fixes and improvements.

Announcing Xen 4.3.2 and 4.2.4 Releases

The Xen Project is pleased to announce the availability of  two maintenance releases: Xen 4.3.2 and Xen 4.2.4.

Xen 4.3.2 Release

This release is available immediately from the git repository:

http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.3 (tag RELEASE-4.3.2)

or from the XenProject download page:

http://www.xenproject.org/downloads/xen-archives/supported-xen-43-series/xen-432.html

This fixes the following critical vulnerabilities:
Continue reading