UBUNTU-CVE-2020-11742

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Source
https://ubuntu.com/security/notices/UBUNTU-CVE-2020-11742
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11742.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-11742
Related
Published
2020-04-14T13:15:00Z
Modified
2020-04-14T13:15:00Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/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 4.13.x, allowing guest OS users to cause a denial of service because of bad continuation handling in GNTTABOPcopy. Grant table operations are expected to return 0 for success, and a negative number for errors. The fix for CVE-2017-12135 introduced a path through grant copy handling where success may be returned to the caller without any action taken. In particular, the status fields of individual operations are left uninitialised, and may result in errant behaviour in the caller of GNTTABOPcopy. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to copy a grant, it hits the incorrect exit path. This returns success to the caller without doing anything, which may cause crashes or other incorrect behaviour.

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-g14b62ab3e5-1ubuntu2.3?arch=src?distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.11.3+24-g14b62ab3e5-1ubuntu2.3

Affected versions

4.*

4.9.2-0ubuntu2
4.9.2-0ubuntu6
4.9.2-0ubuntu7
4.11.3+24-g14b62ab3e5-1ubuntu1
4.11.3+24-g14b62ab3e5-1ubuntu2
4.11.3+24-g14b62ab3e5-1ubuntu2.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "xen-doc": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxengnttab1": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxendevicemodel1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-hypervisor-4.11-armhf": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-hypervisor-4.9-armhf": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxenevtchn1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxentoolcore1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxentoollog1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-hypervisor-common": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-hypervisor-4.9-arm64": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxenforeignmemory1": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxencall1": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-utils-common-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-utils-4.11-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxenmisc4.11-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-system-arm64": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xenstore-utils-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxenstore3.0": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-hypervisor-4.11-arm64": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxengnttab1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxenstore3.0-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-hypervisor-4.9-amd64": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxenforeignmemory1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxendevicemodel1": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxen-dev": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-system-amd64": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxentoolcore1": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxencall1-dbgsym": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xenstore-utils": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxenevtchn1": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-utils-common": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-system-armhf": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxentoollog1": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-hypervisor-4.11-amd64": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "xen-utils-4.11": "4.11.3+24-g14b62ab3e5-1ubuntu2.3",
            "libxenmisc4.11": "4.11.3+24-g14b62ab3e5-1ubuntu2.3"
        }
    ]
}