The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a vigilance database and tools to fix them. |
|
 |
|
|
Synthesis of the vulnerability 
An attacker, inside a guest system, can trigger a fatal error via Linux Event Handler Race of Xen, in order to trigger a denial of service on the host system.
Impacted systems: XenServer, Debian, Fedora, Linux, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this alert: 1/4.
Creation date: 20/10/2020.
Références of this alert: CERTFR-2020-AVI-657, CERTFR-2020-AVI-693, CERTFR-2020-AVI-741, CERTFR-2020-AVI-764, CERTFR-2020-AVI-769, CERTFR-2020-AVI-784, CERTFR-2020-AVI-834, CERTFR-2021-AVI-006, CTX284874, CVE-2020-27675, DLA-2483-1, DLA-2494-1, FEDORA-2020-09e4d062fe, FEDORA-2020-474d747b60, FEDORA-2020-920a258c79, SUSE-SU-2020:3272-1, SUSE-SU-2020:3281-1, SUSE-SU-2020:3491-1, SUSE-SU-2020:3532-1, SUSE-SU-2020:3544-1, USN-4679-1, USN-4680-1, USN-4681-1, VIGILANCE-VUL-33629, XSA-331.
Description of the vulnerability 
An attacker, inside a guest system, can trigger a fatal error via Linux Event Handler Race of Xen, in order to trigger a denial of service on the host system. Full bulletin, software filtering, emails, fixes, ... (Request your free trial)
This cybersecurity alert impacts software or systems such as XenServer, Debian, Fedora, Linux, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Our Vigil@nce team determined that the severity of this weakness 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 security weakness.
Solutions for this threat 
Linux kernel: version 5.9.5.
The version 5.9.5 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v5.x/
Linux kernel: version 5.4.75.
The version 5.4.75 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v5.x/
Linux kernel: version 4.19.155.
The version 4.19.155 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v4.x/
Linux kernel: version 4.14.204.
The version 4.14.204 is fixed:
https://cdn.kernel.org/pub/linux/kernel/v4.x/
Linux kernel: patch for Xen Linux Event Handler Race.
A patch is available:
http://xenbits.xen.org/xsa/xsa331-linux.patch
Citrix Hypervisor, XenServer: patch.
A patch is available:
Citrix Hypervisor 8.2 LTSR: https://support.citrix.com/article/CTX285310 + https://support.citrix.com/article/CTX285316
Citrix Hypervisor 8.1: https://support.citrix.com/article/CTX285309 + https://support.citrix.com/article/CTX285315
Citrix XenServer 7.1 LTSR CU2: https://support.citrix.com/article/CTX285308 + https://support.citrix.com/article/CTX285314
Citrix XenServer 7.0: https://support.citrix.com/article/CTX285307 + https://support.citrix.com/article/CTX285312
Debian 9: new linux-4.19 packages (10/12/2020).
New packages are available:
Debian 9: linux-4.19 4.19.160-2~deb9u1
Debian 9: new linux packages.
New packages are available:
Debian 9: linux 4.9.246-2
Fedora 31-33: new kernel packages.
New packages are available:
Fedora 31: kernel 5.8.17-100.fc31
Fedora 32: kernel 5.8.17-200.fc32
Fedora 33: kernel 5.8.17-300.fc33
SUSE LE 12 SP4: new kernel-default packages.
New packages are available:
SUSE LE 12 SP4: kernel-default 4.12.14-95.65.1
SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
SUSE LE 12 SP5: kernel-azure 4.12.14-16.34.1
SUSE LE 15: new kernel packages.
New packages are available:
SUSE LE 15 RTM: kernel-default-livepatch 4.12.14-150.63.1, kernel-livepatch 4_12_14-150_63-default-1-1.5.1
SUSE LE 15 SP1: new kernel packages.
New packages are available:
SUSE LE 15 SP1: kernel 4.12.14-197.67.1
SUSE LE 15 SP2: new kernel-azure packages (24/11/2020).
New packages are available:
SUSE LE 15 SP2: kernel-azure 5.3.18-18.24.1
Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1103.78
Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.129.128
Ubuntu 18.04 LTS: linux-image-generic 4.15.0.129.116
Ubuntu: new linux-image-4.4.0 packages (06/01/2021).
New packages are available:
Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.198.173
Ubuntu 16.04 LTS: linux-image-generic 4.4.0.198.204
Ubuntu: new linux-image-5.4.0 packages.
New packages are available:
Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.4.0.59.65~18.04.54
Ubuntu 20.04 LTS: linux-image-generic 5.4.0.59.62
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)
Computer vulnerabilities tracking service 
Vigil@nce provides cybersecurity bulletins. The technology watch team tracks security threats targeting the computer system.
|