NVD Vulnerability Detail
Search Exploit, PoC
CVE-2020-15563
Summary

An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected. Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest's video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability.

Publication Date July 7, 2020, 10:15 p.m.
Registration Date Jan. 26, 2021, 11:53 a.m.
Last Update Nov. 21, 2024, 2:05 p.m.
CVSS3.1 : MEDIUM
スコア 6.5
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
攻撃元区分(AV) ローカル
攻撃条件の複雑さ(AC) 低
攻撃に必要な特権レベル(PR) 低
利用者の関与(UI) 不要
影響の想定範囲(S) 変更あり
機密性への影響(C) なし
完全性への影響(I) なし
可用性への影響(A) 高
CVSS2.0 : MEDIUM
Score 4.7
Vector AV:L/AC:M/Au:N/C:N/I:N/A:C
攻撃元区分(AV) ローカル
攻撃条件の複雑さ(AC) 中
攻撃前の認証要否(Au) 不要
機密性への影響(C) なし
完全性への影響(I) なし
可用性への影響(A) 高
Get all privileges. いいえ
Get user privileges いいえ
Get other privileges いいえ
User operation required いいえ
Affected software configurations
Configuration1 or higher or less more than less than
cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:* 4.8.0 4.13.1
Configuration2 or higher or less more than less than
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Configuration3 or higher or less more than less than
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Configuration4 or higher or less more than less than
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
Related information, measures and tools
Common Vulnerabilities List
JVN Vulnerability Information
Xen における入力確認に関する脆弱性
Title Xen における入力確認に関する脆弱性
Summary

Xen には、入力確認に関する脆弱性が存在します。

Possible impacts サービス運用妨害 (DoS) 状態にされる可能性があります。
Solution

ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。
Publication Date July 7, 2020, midnight
Registration Date Aug. 25, 2020, 3:35 p.m.
Last Update Aug. 25, 2020, 3:35 p.m.
Affected System
Debian
Debian GNU/Linux 
Xen プロジェクト
Xen 
CVE (情報セキュリティ 共通脆弱性識別子)
CWE (共通脆弱性タイプ一覧)
ベンダー情報
Change Log
No Changed Details Date of change
1 [2020年08月25日]
  掲載		 Aug. 25, 2020, 3:35 p.m.