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Vulnerability of Xen: privilege escalation via ARM Unmasked Interrupts

Synthesis of the vulnerability

An attacker, inside a guest system, can bypass restrictions via ARM Unmasked Interrupts of Xen, in order to escalate his privileges on the host system.
Severity of this alert: 2/4.
Creation date: 31/10/2019.
Références of this alert: CERTFR-2019-AVI-541, CVE-2019-18422, DSA-4602-1, FEDORA-2019-cbb732f760, SUSE-SU-2019:2961-1, SUSE-SU-2019:3297-1, SUSE-SU-2019:3309-1, SUSE-SU-2019:3310-1, VIGILANCE-VUL-30761, XSA-303.

Description of the vulnerability

An attacker, inside a guest system, can bypass restrictions via ARM Unmasked Interrupts of Xen, in order to escalate his privileges on the host system.
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This computer threat announce impacts software or systems such as Debian, Fedora, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this computer vulnerability is medium.

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 cybersecurity alert.

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 ARM Unmasked Interrupts.
A patch is available:
  http://xenbits.xen.org/xsa/xsa303.meta
  http://xenbits.xen.org/xsa/xsa303-4.8/0001-Revert-xen-arm32-entry-Consolidate-DEFINE_TRAP_ENTRY.patch
  http://xenbits.xen.org/xsa/xsa303-4.8/0002-xen-arm32-entry-Consolidate-DEFINE_TRAP_ENTRY-macros.patch
  http://xenbits.xen.org/xsa/xsa303-4.8/0003-xen-arm32-entry-Fold-the-macro-SAVE_ALL-in-the-macro.patch
  http://xenbits.xen.org/xsa/xsa303-4.8/0004-xen-arm32-Don-t-blindly-unmask-interrupts-on-trap-wi.patch
  http://xenbits.xen.org/xsa/xsa303-4.8/0005-xen-arm64-Don-t-blindly-unmask-interrupts-on-trap-wi.patch
  http://xenbits.xen.org/xsa/xsa303/0001-xen-arm32-entry-Split-__DEFINE_ENTRY_TRAP-in-two.patch
  http://xenbits.xen.org/xsa/xsa303/0002-xen-arm32-entry-Fold-the-macro-SAVE_ALL-in-the-macro.patch
  http://xenbits.xen.org/xsa/xsa303/0003-xen-arm32-Don-t-blindly-unmask-interrupts-on-trap-wi.patch
  http://xenbits.xen.org/xsa/xsa303/0004-xen-arm64-Don-t-blindly-unmask-interrupts-on-trap-wi.patch

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 4.11.2-3.fc30

SUSE LE 12 SP3: new xen packages.
New packages are available:
  SUSE LE 12 SP3: xen 4.9.4_06-3.59.1

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 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_04-3.6.1
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