#VU46979 Resource management error in Xen - CVE-2020-25596

Vulnerability identifier: #VU46979

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-25596

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within guest VM when processing state sanitization activities. A local user or application on the guest operating system can abuse SYSENTER to cause a crash of the guest VM.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Xen: 3.2 - 4.14.0

---

External links
https://xenbits.xen.org/xsa/advisory-339.html

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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