Improper Privilege Management in Xen - CVE-2020-27671
Published: October 22, 2020 / Updated: November 24, 2020
Vulnerability identifier: #VU48638
CSH Severity: Medium
CVSS v4: 7.5 [CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-27671
CWE-ID: CWE-269
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to improper privilege management within the IOMMU TLB implementation. A local user on a guest OS can escalate privileges on the system by running a specially crafted application.
Affected software
Xen
Gentoo Linux
Debian Linux
Fedora
xen (Alpine package)
xen (Debian package)
xen
app-emulation/xen
app-emulation/xen-tools
Gentoo Linux
Debian Linux
Fedora
xen (Alpine package)
xen (Debian package)
xen
app-emulation/xen
app-emulation/xen-tools
How to mitigate CVE-2020-27671
Install updates from vendor's website.
xen (Debian package) - update to 4.11.4+57-g41a822c392-1
xen - addressed in versions 4.12.3-7.fc31, 4.12.3-8.fc31
app-emulation/xen - update to 4.13.2
app-emulation/xen-tools - update to 4.13.2
xen - addressed in versions 4.12.3-7.fc31, 4.12.3-8.fc31
app-emulation/xen - update to 4.13.2
app-emulation/xen-tools - update to 4.13.2
External References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00075.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00025.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XIK57QJOVOPWH6RFRNMGOBCROBCKMDG2/
- https://security.gentoo.org/glsa/202011-06
- https://xenbits.xen.org/xsa/advisory-346.html