CVE-2020-15563

Katalog CVE

CVSS 6.5 · Medium EPSS 0,41%

Kerentanan Improper Restriction of Operations within the Bounds of a Memory Buffer pada xen, debian linux +2 lainnya. Skor CVSS 3.1 6.5 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

7 Juli 2020

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

6.5 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

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

EPSS (30 hari)

0,41% peluang dieksploitasi; lebih tinggi dari 33,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• http://xenbits.xen.org/xsa/advisory-319.html patch · advisory vendor
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html mailing list · advisory pihak ketiga
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.html mailing list · advisory pihak ketiga
• http://www.openwall.com/lists/oss-security/2020/07/07/3 mailing list · advisory pihak ketiga
• https://security.gentoo.org/glsa/202007-02 advisory pihak ketiga
• https://www.debian.org/security/2020/dsa-4723 advisory pihak ketiga
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRN...
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2I...