Race condition in Xen - CVE-2020-27672
Published: October 22, 2020 / Updated: January 24, 2021
Vulnerability identifier: #VU49941
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-27672
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local authenticated user to execute arbitrary code.
An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a host OS denial of service, achieve data corruption, or possibly gain privileges by exploiting a race condition that leads to a use-after-free involving 2MiB and 1GiB superpages.
Affected software
Xen
Gentoo Linux
Debian Linux
Fedora
xen (Alpine package)
xen (Debian package)
xen
app-emulation/xen
app-emulation/xen-tools
IBM Systems Director
Gentoo Linux
Debian Linux
Fedora
xen (Alpine package)
xen (Debian package)
xen
app-emulation/xen
app-emulation/xen-tools
IBM Systems Director
How to mitigate CVE-2020-27672
Install update 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
- http://www.openwall.com/lists/oss-security/2021/01/19/7
- http://xenbits.xen.org/xsa/advisory-345.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XIK57QJOVOPWH6RFRNMGOBCROBCKMDG2/
- https://security.gentoo.org/glsa/202011-06
- https://www.debian.org/security/2020/dsa-4804
- https://xenbits.xen.org/xsa/advisory-345.html