UBUNTU-CVE-2019-18420

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Source
https://ubuntu.com/security/notices/UBUNTU-CVE-2019-18420
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-18420.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2019-18420
Related
Published
2019-10-31T14:15:00Z
Modified
2019-10-31T14:15:00Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOPinitialise hypercall. hypercallcreatecontinuation() is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG(), which crashes Xen. One path, via the VCPUOPinitialise hypercall, has a bad format character. The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a continuation to be created. Malicious guests may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable. Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot exploit the vulnerability.

References

Affected packages

Ubuntu:Pro:16.04:LTS / xen

Package

Name
xen

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.5.1-0ubuntu1
4.5.1-0ubuntu2
4.6.0-1ubuntu1
4.6.0-1ubuntu2
4.6.0-1ubuntu4
4.6.0-1ubuntu4.1
4.6.0-1ubuntu4.2
4.6.0-1ubuntu4.3
4.6.5-0ubuntu1
4.6.5-0ubuntu1.1
4.6.5-0ubuntu1.2
4.6.5-0ubuntu1.4

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:Pro:18.04:LTS / xen

Package

Name
xen

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.9.0-0ubuntu3
4.9.0-0ubuntu4
4.9.2-0ubuntu1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:20.04:LTS / xen

Package

Name
xen
Purl
pkg:deb/ubuntu/xen@4.11.3+24-g14b62ab3e5-1ubuntu1?arch=src?distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.11.3+24-g14b62ab3e5-1ubuntu1

Affected versions

4.*

4.9.2-0ubuntu2
4.9.2-0ubuntu6
4.9.2-0ubuntu7

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "xen-doc": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxengnttab1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxendevicemodel1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.11-armhf": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.9-armhf": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenevtchn1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxentoolcore1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxentoollog1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-common": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.9-arm64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenforeignmemory1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxencall1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-utils-common-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-utils-4.11-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenmisc4.11-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-system-arm64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xenstore-utils-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenstore3.0": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.11-arm64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxengnttab1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenstore3.0-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.9-amd64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenforeignmemory1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxendevicemodel1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxen-dev": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-system-amd64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxentoolcore1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxencall1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xenstore-utils": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenevtchn1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-utils-common": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-system-armhf": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxentoollog1": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-hypervisor-4.11-amd64": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "xen-utils-4.11": "4.11.3+24-g14b62ab3e5-1ubuntu1",
            "libxenmisc4.11": "4.11.3+24-g14b62ab3e5-1ubuntu1"
        }
    ]
}