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Vulnerability of Xen: denial of service via Debug Exceptions Blocked States

Synthesis of the vulnerability 

An attacker can trigger a fatal error via Debug Exceptions Blocked States of Xen, in order to trigger a denial of service.
Vulnerable systems: XenServer, Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this threat: 1/4.
Creation date: 11/12/2019.
Références of this weakness: CERTFR-2019-AVI-628, CERTFR-2019-AVI-630, CTX266932, CVE-2019-19583, DSA-4602-1, FEDORA-2019-2e12bd3a9a, openSUSE-SU-2020:0011-1, SUSE-SU-2019:3296-1, SUSE-SU-2019:3297-1, SUSE-SU-2019:3309-1, SUSE-SU-2019:3310-1, SUSE-SU-2019:3338-1, SUSE-SU-2020:0334-1, SUSE-SU-2020:0388-1, SUSE-SU-2020:1630-1, VIGILANCE-VUL-31124, XSA-308.

Description of the vulnerability 

An attacker can trigger a fatal error via Debug Exceptions Blocked States of Xen, in order to trigger a denial of service.
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This weakness impacts software or systems such as XenServer, Debian, Fedora, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this vulnerability announce is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this threat bulletin.

Solutions for this threat 

Xen: version 4.12.2.
The version 4.12.2 is fixed:
  http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.12
  https://xenproject.org/downloads/xen-project-archives/xen-project-4-12-series/xen-project-4-12-2/

Xen: version 4.11.3.
The version 4.11.3 is fixed:
  http://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=refs/heads/stable-4.11
  https://xenproject.org/downloads/xen-project-archives/xen-project-4-11-series/xen-project-4-11-3/

Xen: patch for Debug Exceptions Blocked States.
A patch is available:
  http://xenbits.xen.org/xsa/xsa308.patch

Citrix Hypervisor, XenServer: patch.
A patch is available:
  Citrix Hypervisor 8.0: CTX263620 - https://support.citrix.com/article/CTX263620
  Citrix XenServer 7.6: CTX263619 - https://support.citrix.com/article/CTX263619
  Citrix XenServer 7.1 LTSR CU2: CTX263618 - https://support.citrix.com/article/CTX263618
  Citrix XenServer 7.0: CTX263617 - https://support.citrix.com/article/CTX263617

Debian 9/10: new xen packages.
New packages are available:
  Debian 9: xen 4.8.5.final+shim4.10.4-1+deb9u12
  Debian 10: xen 4.11.3+24-g14b62ab3e5-1~deb10u1

Fedora 30: new xen packages.
New packages are available:
  Fedora 30: xen 4.11.3-2.fc30

openSUSE Leap 15.1: new xen packages.
New packages are available:
  openSUSE Leap 15.1: xen 4.12.1_06-lp151.2.9.1

SUSE LE 12 SP1: new xen packages.
New packages are available:
  SUSE LE 12 SP1: xen 4.5.5_28-22.64.1

SUSE LE 12 SP2: new xen packages.
New packages are available:
  SUSE LE 12 SP2: xen 4.7.6_06-43.59.1

SUSE LE 12 SP3: new xen packages (16/12/2019).
New packages are available:
  SUSE LE 12 SP3: xen 4.9.4_06-3.59.1

SUSE LE 12 SP3: new xen packages (17/06/2020).
New packages are available:
  SUSE LE 12 SP3: xen 4.9.4_06-3.62.1

SUSE LE 12 SP4: new xen packages (18/12/2019).
New packages are available:
  SUSE LE 12 SP4: xen 4.11.3_02-2.20.1

SUSE LE 12 SP5: new xen packages.
New packages are available:
  SUSE LE 12 SP5: xen 4.12.1_10-3.8.1

SUSE LE 15 RTM: new xen packages.
New packages are available:
  SUSE LE 15 RTM: xen 4.10.4_08-3.28.1

SUSE LE 15 SP1: new xen packages.
New packages are available:
  SUSE LE 15 SP1: xen 4.12.1_06-3.9.1
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