#VU48638 Improper Privilege Management in Xen - CVE-2020-27671

Vulnerability identifier: #VU48638

Vulnerability risk: Medium

CVSSv4.0: 4.8 [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/E:U/U:Green]

CVE-ID: CVE-2020-27671

CWE-ID: CWE-269

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: 4.2.0 - 4.14.0

---

External links
https://lists.opensuse.org/opensuse-security-announce/2020-10/msg00075.html
https://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

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.