Vulnerability CVE-2020-27821

Vulnerability Name:

CVE-2020-27821 (CCN-193325)

Assigned:

2020-12-03

Published:

2020-12-03

Updated:

2022-09-30

Summary:

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

CVSS v3 Severity:

6.0 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H)
5.2 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): High User Interaction (UI): None
Scope:	Scope (S): Changed
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Changed
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

5.7 Medium (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L)
5.0 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): High User Interaction (UI): None
Scope:	Scope (S): Changed
Impact Metrics:	Confidentiality (C): Low Integrity (I): Low Availibility (A): Low

CVSS v2 Severity:

2.1 Low (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

4.6 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:N/A:C)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Complete

Vulnerability Type:

CWE-787
CWE-787
CWE-122
CWE-122

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2020-27821

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20201216 CVE-2020-27821 QEMU: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1902651

Source: XF
Type: UNKNOWN
qemu-cve202027821-dos(193325)

Source: CCN
Type: QEMU GIT Repository
memory: clamp cached translation in case it points to an MMIO region

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security update

Source: CCN
Type: oss-sec Mailing List, Wed, 16 Dec 2020 18:05:58 +0100
CVE-2020-27821 QEMU: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20210115-0006/

Source: CCN
Type: QEMU Web site
Contribute to QEMU! - QEMU

Vulnerable Configuration:

Configuration 1:

cpe:/a:qemu:qemu:*:*:*:*:*:*:*:* (Version < 5.2.0)

Configuration 2:

cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Configuration RedHat 1:

cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

Configuration RedHat 2:

cpe:/a:redhat:enterprise_linux:8::appstream:*:*:*:*:*

Configuration RedHat 3:

cpe:/a:redhat:enterprise_linux:8::crb:*:*:*:*:*

Configuration CCN 1:

cpe:/a:qemu:qemu:-:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:8034	P	libpcp-devel-5.2.5-150400.5.3.11 on GA media (Moderate)	2023-06-20
oval:org.opensuse.security:def:7791	P	qemu-tools-7.1.0-150500.47.15 on GA media (Moderate)	2023-06-12
oval:org.opensuse.security:def:7948	P	libmozjs-78-0-78.15.0-150400.1.10 on GA media (Moderate)	2023-06-12
oval:org.opensuse.security:def:719	P	Security update for gstreamer-plugins-good (Important)	2022-08-31
oval:org.opensuse.security:def:3620	P	Security update for xen (Important)	2022-07-06
oval:org.opensuse.security:def:3518	P	guile-2.0.9-9.3.1 on GA media (Moderate)	2022-06-28
oval:org.opensuse.security:def:3385	P	tpm2.0-tools-3.1.4-1.12 on GA media (Moderate)	2022-06-28
oval:org.opensuse.security:def:3187	P	libidn-tools-1.28-5.6.1 on GA media (Moderate)	2022-06-28
oval:org.opensuse.security:def:95201	P	libavformat58_76-4.4-150400.1.13 on GA media (Moderate)	2022-06-22
oval:org.opensuse.security:def:95148	P	qemu-6.2.0-150400.35.10 on GA media (Moderate)	2022-06-22
oval:org.opensuse.security:def:94497	P	aspell-0.60.8-3.3.1 on GA media (Moderate)	2022-06-22
oval:org.opensuse.security:def:94817	P	qemu-tools-6.2.0-150400.35.10 on GA media (Moderate)	2022-06-22
oval:org.opensuse.security:def:351	P	qemu-6.2.0-150400.35.10 on GA media (Moderate)	2022-06-10
oval:org.opensuse.security:def:6053	P	Security update for postgresql13 (Important)	2022-05-25
oval:org.opensuse.security:def:113318	P	qemu-6.1.0-32.1 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:99440	P	(Moderate)	2021-12-06
oval:org.opensuse.security:def:106728	P	qemu-6.1.0-32.1 on GA media (Moderate)	2021-10-01
oval:org.opensuse.security:def:101914	P	Security update for the Linux Kernel (Live Patch 0 for SLE 15 SP3) (Important)	2021-08-17
oval:org.opensuse.security:def:101210	P	libopenjpeg1-1.5.2-2.28 on GA media (Moderate)	2021-08-09
oval:org.opensuse.security:def:111576	P	Security update for qemu (Important)	2021-07-11
oval:org.opensuse.security:def:101450	P	Security update for qemu (Important)	2021-06-10
oval:org.opensuse.security:def:64709	P	Security update for qemu (Important)	2021-06-10
oval:org.opensuse.security:def:69123	P	Security update for qemu (Important)	2021-06-10
oval:org.opensuse.security:def:76210	P	Security update for qemu (Important)	2021-06-10
oval:org.opensuse.security:def:1611	P	Security update for qemu (Important)	2021-06-10
oval:org.opensuse.security:def:67142	P	Security update for qemu (Important)	2021-06-10
oval:org.opensuse.security:def:73831	P	Security update for qemu (Important)	2021-06-10
oval:org.opensuse.security:def:97059	P	Security update for qemu (Important)	2021-06-10
oval:org.opensuse.security:def:99639	P	(Important)	2021-06-01
oval:com.redhat.rhsa:def:20211762	P	RHSA-2021:1762: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update (Moderate)	2021-05-18
oval:org.opensuse.security:def:111339	P	Security update for qemu (Important)	2021-04-23
oval:org.opensuse.security:def:9690	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:99945	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:5653	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:92291	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:69037	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:75810	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:8740	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:99241	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:34409	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:93041	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:70381	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:10241	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:96029	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:107876	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:92490	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:96856	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:117391	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:8935	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:93194	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:91901	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:66742	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:42061	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:73596	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:98851	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:108580	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:92689	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:96858	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:69631	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:118481	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:60232	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:9491	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:92096	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:102719	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:99046	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:109385	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:92888	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:69830	P	Security update for qemu (Important)	2021-04-16
oval:org.opensuse.security:def:64474	P	Security update for qemu (Important)	2021-04-16

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