Vulnerability Name:

CVE-2021-27379 (CCN-197003)

Assigned:2021-02-18
Published:2021-02-18
Updated:2022-05-27
Summary:An issue was discovered in Xen through 4.11.x, allowing x86 Intel HVM guest OS users to achieve unintended read/write DMA access, and possibly cause a denial of service (host OS crash) or gain privileges. This occurs because a backport missed a flush, and thus IOMMU updates were not always correct.
Note: this issue exists because of an incomplete fix for CVE-2020-15565.
CVSS v3 Severity:7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
6.2 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/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): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.9 Medium (CVSS v2 Vector: AV:L/AC:M/Au:N/C:P/I:P/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
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 Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-27379

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20210223 Xen Security Advisory 366 v2 (CVE-2021-27379) - missed flush in XSA-321 backport

Source: CCN
Type: Xen Security Advisory XSA-366
missed flush in XSA-321 backport

Source: CONFIRM
Type: Mitigation, Patch, Vendor Advisory
http://xenbits.xen.org/xsa/advisory-366.html

Source: XF
Type: UNKNOWN
xen-cve202127379-dos(197003)

Source: DEBIAN
Type: Third Party Advisory
DSA-4888

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-27379

Source: MISC
Type: Patch, Vendor Advisory
https://xenbits.xen.org/xsa/advisory-366.html

Vulnerable Configuration:Configuration 1:
  • cpe:/o:xen:xen:*:*:*:*:*:*:x86:* (Version >= 3.2.0 and < 4.12.0)

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

    • Configuration CCN 1:
  • cpe:/a:xensource:xen:4.0:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.1.1:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.1.2:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.1:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:3.4:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:4.2:*:*:*:*:*:*:*
  • OR cpe:/a:xensource:xen:3.4.0:*:*:*:*:*:*:*
  • 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:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:55172
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:30002
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:82121
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:55825
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:21392
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:82556
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:28914
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:23151
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:83209
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:54737
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:29349
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:81073
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:51139
    P
    		Security update for xen (Important)
    2021-04-20
    oval:org.opensuse.security:def:8563
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:126690
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:86536
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:96859
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:57895
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:51539
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:32899
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:89114
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:23886
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:84585
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:69448
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:9308
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:127087
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:31153
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:87363
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:58722
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:51874
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:33636
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:89372
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:85617
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:70202
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:56976
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:10062
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:31608
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:88103
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:59459
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:33894
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:125519
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:86072
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:57431
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:32072
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:88415
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:23551
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:84128
    P
    		Security update for xen (Important)
    2021-04-19
    oval:org.opensuse.security:def:59717
    P
    		Security update for xen (Important)
    2021-04-19
    BACK
    xen xen *
    debian debian linux 10.0
    xensource xen 4.0
    xensource xen 4.1.1
    xensource xen 4.1.2
    xensource xen 4.1
    xensource xen 3.4
    xensource xen 4.2
    xensource xen 3.4.0
    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