Buffer overflow in Xen



Published: 2020-10-22 | Updated: 2021-01-24
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-27674
CWE-ID CWE-119
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Xen
Server applications / Virtualization software

Vendor Xen Project

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU49942

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-27674

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The vulnerability allows a local authenticated user to read and manipulate data.

An issue was discovered in Xen through 4.14.x allowing x86 PV guest OS users to gain guest OS privileges by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an INVLPG-like attack technique.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 4.0.0 - 4.14.1


CPE2.3 External links

http://www.openwall.com/lists/oss-security/2021/01/19/5
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PZAM3LYJ5TZLSSNL3KXFILM46QKVTOUA/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3U4LNKKXU4UP4Z5XP6TMIWSML3QODPE/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XIK57QJOVOPWH6RFRNMGOBCROBCKMDG2/
http://security.gentoo.org/glsa/202011-06
http://www.debian.org/security/2020/dsa-4804
http://xenbits.xen.org/xsa/advisory-286.html

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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