Vulnerability Name:

CVE-2020-29483 (CCN-193138)

Assigned:2020-12-15
Published:2020-12-15
Updated:2021-03-16
Summary:An issue was discovered in Xen through 4.14.x. Xenstored and guests communicate via a shared memory page using a specific protocol. When a guest violates this protocol, xenstored will drop the connection to that guest. Unfortunately, this is done by just removing the guest from xenstored's internal management, resulting in the same actions as if the guest had been destroyed, including sending an @releaseDomain event. @releaseDomain events do not say that the guest has been removed. All watchers of this event must look at the states of all guests to find the guest that has been removed. When an @releaseDomain is generated due to a domain xenstored protocol violation, because the guest is still running, the watchers will not react. Later, when the guest is actually destroyed, xenstored will no longer have it stored in its internal data base, so no further @releaseDomain event will be sent. This can lead to a zombie domain; memory mappings of that guest's memory will not be removed, due to the missing event. This zombie domain will be cleaned up only after another domain is destroyed, as that will trigger another @releaseDomain event. If the device model of the guest that violated the Xenstore protocol is running in a stub-domain, a use-after-free case could happen in xenstored, after having removed the guest from its internal data base, possibly resulting in a crash of xenstored. A malicious guest can block resources of the host for a period after its own death. Guests with a stub domain device model can eventually crash xenstored, resulting in a more serious denial of service (the prevention of any further domain management operations). Only the C variant of Xenstore is affected; the Ocaml variant is not affected. Only HVM guests with a stubdom device model can cause a serious DoS.
CVSS v3 Severity:6.5 Medium (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 (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
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-416
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-29483

Source: XF
Type: UNKNOWN
xen-cve202029483-dos(193138)

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

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

Source: DEBIAN
Type: Third Party Advisory
DSA-4812

Source: CCN
Type: Xen Security Advisory XSA-325
Xenstore: guests can disturb domain cleanup

Source: MISC
Type: Patch, Vendor Advisory
https://xenbits.xenproject.org/xsa/advisory-325.txt

Vulnerable Configuration:Configuration 1:
  • cpe:/o:xen:xen:*:*:*:*:*:*:*:* (Version <= 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:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast 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:7895
    P
    		gnome-extensions-41.9-150400.3.8.1 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:7945
    P
    		libmicrohttpd-devel-0.9.57-150000.3.3.1 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:3192
    P
    		libjavascriptcoregtk-3_0-0-2.4.11-23.20 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3363
    P
    		screen-4.0.4-23.3.3 on GA media (Moderate)
    2022-06-28
    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: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: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:5340
    P
    		Security update for libsndfile (Important)
    2022-01-05
    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:2296
    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:101411
    P
    		xen-4.14.1_16-1.6 on GA media (Moderate)
    2021-08-10
    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:62354
    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:101112
    P
    		xen-libs-4.14.1_16-1.6 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:44024
    P
    		Security update for xen (Important)
    2021-01-07
    oval:org.opensuse.security:def:39594
    P
    		Security update for xen (Important)
    2021-01-07
    oval:org.opensuse.security:def:41032
    P
    		Security update for xen (Important)
    2021-01-05
    oval:org.opensuse.security:def:45462
    P
    		Security update for xen (Important)
    2021-01-05
    oval:org.opensuse.security:def:85566
    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:57395
    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:86036
    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:57845
    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:86486
    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: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:31102
    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:110928
    P
    		Security update for xen (Moderate)
    2020-12-26
    oval:org.opensuse.security:def:28873
    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:75777
    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:125508
    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: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: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:108547
    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:5620
    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:33884
    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:29310
    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:81032
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:126680
    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: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:23875
    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:73574
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:117369
    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:55786
    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:82080
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:127077
    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: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:51863
    P
    		Security update for xen (Moderate)
    2020-12-22
    oval:org.opensuse.security:def:118478
    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:23109
    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:107854
    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: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:104085
    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:91778
    P
    		Security update for xen (Moderate)
    2020-12-18
    oval:org.opensuse.security:def:4966
    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:104791
    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:68984
    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: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:105418
    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: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:98728
    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: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 *