Vulnerability Name:

CVE-2020-29571 (CCN-193119)

Assigned:2020-12-15
Published:2020-12-15
Updated:2021-12-10
Summary:An issue was discovered in Xen through 4.14.x. A bounds check common to most operation time functions specific to FIFO event channels depends on the CPU observing consistent state. While the producer side uses appropriately ordered writes, the consumer side isn't protected against re-ordered reads, and may hence end up de-referencing a NULL pointer. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. Only Arm systems may be vulnerable. Whether a system is vulnerable depends on the specific CPU. x86 systems are not vulnerable.
CVSS v3 Severity:6.2 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.4 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/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): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
6.2 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
5.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/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): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
4.9 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-476
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-29571

Source: XF
Type: UNKNOWN
xen-cve202029571-dos(193119)

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2020-df772b417b

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2020-64859a826b

Source: GENTOO
Type: Third Party Advisory
GLSA-202107-30

Source: DEBIAN
Type: Third Party Advisory
DSA-4812

Source: CCN
Type: Xen Security Advisory XSA-359
FIFO event channels control structure ordering

Source: MISC
Type: Patch, Vendor Advisory
https://xenbits.xenproject.org/xsa/advisory-359.html

Vulnerable Configuration:Configuration 1:
  • cpe:/o:xen:xen:*:*:*:*:*:*:arm:* (Version >= 4.4.0 and <= 4.14.0)

    • Configuration 2:
  • cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:fedoraproject:fedora:32:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:33:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:xensource:xen:4.4:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.5:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.6:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.7:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.8:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.9:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.10:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.11:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.12:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.13:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    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:94855
    P
    		xen-libs-4.16.0_08-150400.2.12 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:3192
    P
    		ruby2.5-rubygem-bundler-1.16.1-3.3.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95168
    P
    		apache-commons-beanutils-1.9.4-1.68 on GA media (Moderate)
    2022-06-22
    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:3363
    P
    		ant-1.10.7-150200.4.6.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:3225
    P
    		xen-libs-4.16.0_08-150400.2.12 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:3535
    P
    		xen-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:94475
    P
    		 (Important)
    2022-01-11
    oval:org.opensuse.security:def:101881
    P
    		Security update for ncurses (Moderate)
    2021-10-20
    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:96764
    P
    		qemu-tools-3.1.0-7.1 on GA media (Moderate)
    2021-09-21
    oval:org.opensuse.security:def:96773
    P
    		sharutils-4.15.2-2.21 on GA media (Moderate)
    2021-09-21
    oval:org.opensuse.security:def:96774
    P
    		shim-15+git47-1.5 on GA media (Moderate)
    2021-09-21
    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:63385
    P
    		xen-4.14.1_16-1.6 on GA media (Moderate)
    2021-08-10
    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:2296
    P
    		xen-4.14.1_16-1.6 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:62354
    P
    		xen-libs-4.14.1_16-1.6 on GA media (Moderate)
    2021-08-09
    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:101188
    P
    		libexempi-devel-2.4.5-3.3.2 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:45462
    P
    		Security update for xen (Important)
    2021-01-05
    oval:org.opensuse.security:def:41032
    P
    		Security update for xen (Important)
    2021-01-05
    oval:org.opensuse.security:def:86486
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:32022
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:58664
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:84543
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:56925
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:87305
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:32841
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:85566
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:31102
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:57395
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:86036
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:31572
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:57845
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:23499
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:51487
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:84088
    P
    		Security update for xen (Moderate)
    2020-12-29
    oval:org.opensuse.security:def:110928
    P
    		Security update for xen (Moderate)
    2020-12-26
    oval:org.opensuse.security:def:29310
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:55786
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:82080
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:9280
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:64452
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:102716
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:89104
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:23875
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:51863
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:108547
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:73574
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:110384
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:69034
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:29963
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:21359
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:82517
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:10034
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:59449
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:89362
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:54696
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:109382
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:96026
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:7945
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:69420
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:88089
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:23109
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:51097
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:83170
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:66709
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:33626
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:59707
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:28873
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:55133
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:75777
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:81032
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:8537
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:70174
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:88398
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:107854
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:5620
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:33884
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:104085
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:90430
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:7895
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:34338
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:98728
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:104791
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:91136
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:66429
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:25979
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:75497
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:105418
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:91778
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:5340
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:97395
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:64281
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:73403
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:68984
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:60161
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:98101
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:41884
    P
    		Security update for xen (Moderate)
    2020-12-16
    oval:org.opensuse.security:def:46314
    P
    		Security update for xen (Moderate)
    2020-12-16
    BACK
    xen xen *
    debian debian linux 10.0
    fedoraproject fedora 32
    fedoraproject fedora 33
    xensource xen 4.4
    xensource xen 4.5
    xensource xen 4.6
    xensource xen 4.7
    xensource xen 4.8
    xensource xen 4.9
    xensource xen 4.10
    xensource xen 4.11
    xensource xen 4.12
    xensource xen 4.13