Vulnerability CVE-2020-29040

Vulnerability Name:

CVE-2020-29040 (CCN-192284)

Assigned:

2020-11-24

Published:

2020-11-24

Updated:

2022-04-26

Summary:

An issue was discovered in Xen through 4.14.x allowing x86 HVM guest OS users to cause a denial of service (stack corruption), cause a data leak, or possibly gain privileges because of an off-by-one error.
Note: this issue is caused by an incorrect fix for CVE-2020-27671.

CVSS v3 Severity:

8.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
7.7 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/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): High Integrity (I): High Availibility (A): High

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

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

CVSS v2 Severity:

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

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

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

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

Vulnerability Type:

CWE-787
CWE-193

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2020-29040

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20210119 Xen Security Advisory 355 v3 (CVE-2020-29040) - stack corruption from XSA-346 change

Source: CCN
Type: Xen Security Advisory XSA-355
stack corruption from XSA-346 change

Source: CONFIRM
Type: Vendor Advisory
http://xenbits.xen.org/xsa/advisory-355.html

Source: XF
Type: UNKNOWN
xen-cve202029040-dos(192284)

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2020-29040

Source: MISC
Type: Vendor Advisory
https://xenbits.xen.org/xsa/advisory-355.html

Vulnerable Configuration:

Configuration 1:

cpe:/o:xen:xen:*:*:*:*:*:*:*:* (Version <= 4.14.0)

Configuration CCN 1:

cpe:/a:xensource:xen:*:*:*:*:*:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:7831	P	xen-libs-4.17.0_06-150500.1.10 on GA media (Moderate)	2023-06-12
oval:org.opensuse.security:def:635	P	Security update for rubygem-activesupport-5_1 (Moderate) (in QA)	2022-09-29
oval:org.opensuse.security:def:3225	P	libopus0-1.1-3.1 on GA media (Moderate)	2022-06-28
oval:org.opensuse.security:def:3535	P	java-1_8_0-openjdk-1.8.0.222-27.35.2 on GA media (Moderate)	2022-06-28
oval:org.opensuse.security:def:95165	P	xen-4.16.0_08-150400.2.12 on GA media (Moderate)	2022-06-22
oval:org.opensuse.security:def:94855	P	xen-libs-4.16.0_08-150400.2.12 on GA media (Moderate)	2022-06-22
oval:org.opensuse.security:def:336	P	xen-libs-4.14.1_16-1.6 on GA media (Moderate)	2022-06-13
oval:org.opensuse.security:def:388	P	xen-libs-4.16.0_08-150400.2.12 on GA media (Moderate)	2022-06-10
oval:org.opensuse.security:def:113591	P	xen-4.15.1_01-1.2 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:106977	P	xen-4.15.1_01-1.2 on GA media (Moderate)	2021-10-01
oval:org.opensuse.security:def:1265	P	Security update for the Linux Kernel (Live Patch 3 for SLE 15 SP3) (Important)	2021-09-16
oval:org.opensuse.security:def:101411	P	xen-4.14.1_16-1.6 on GA media (Moderate)	2021-08-10
oval:org.opensuse.security:def:63385	P	xen-4.14.1_16-1.6 on GA media (Moderate)	2021-08-10
oval:org.opensuse.security:def:2296	P	xen-4.14.1_16-1.6 on GA media (Moderate)	2021-08-10
oval:org.opensuse.security:def:101112	P	xen-libs-4.14.1_16-1.6 on GA media (Moderate)	2021-08-09
oval:org.opensuse.security:def:72095	P	xen-libs-4.14.1_16-1.6 on GA media (Moderate)	2021-08-09
oval:org.opensuse.security:def:62354	P	xen-libs-4.14.1_16-1.6 on GA media (Moderate)	2021-08-09

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