Vulnerability Name:

CVE-2020-27749 (CCN-197606)

Assigned:2020-10-27
Published:2021-03-02
Updated:2022-05-13
Summary:A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
CVSS v3 Severity:6.7 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
5.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/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): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:H/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): High
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.5 High (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H)
6.5 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:H/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): High
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.2 High (CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
6.0 Medium (CCN CVSS v2 Vector: AV:L/AC:H/Au:S/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): High
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-121
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2020-27749

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1899966

Source: XF
Type: UNKNOWN
gnugrub-cve202027749-bo(197606)

Source: CCN
Type: GRUB GIT Repository
GNU GRUB2

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-cab258a413

Source: CCN
Type: oss-sec Mailing List, Tue, 2 Mar 2021 18:13:44 +0000
Multiple GRUB2 vulnerabilities

Source: GENTOO
Type: Third Party Advisory
GLSA-202104-05

Source: CONFIRM
Type: Third Party Advisory
https://security.netapp.com/advisory/ntap-20220325-0001/

Source: CCN
Type: IBM Security Bulletin 6475265 (QRadar SIEM)
GRUB2 as used by IBM QRadar SIEM is vulnerable to arbitrary code execution

Vulnerable Configuration:Configuration 1:
  • cpe:/a:gnu:grub2:*:*:*:*:*:*:*:* (Version < 2.06)

    • Configuration 2:
  • cpe:/o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_tus:7.4:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_eus:7.7:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_eus:8.1:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:34:*:*:*:*:*:*:*

    • Configuration 4:
  • cpe:/a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*

    • Configuration RedHat 1:
  • cpe:/o:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:8::baseos:*:*:*:*:*

    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:7:*:*:*:*:*:*:*

    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:7::client:*:*:*:*:*

    • Configuration RedHat 5:
  • cpe:/o:redhat:enterprise_linux:7::computenode:*:*:*:*:*

    • Configuration RedHat 6:
  • cpe:/o:redhat:enterprise_linux:7::server:*:*:*:*:*

    • Configuration RedHat 7:
  • cpe:/o:redhat:enterprise_linux:7::workstation:*:*:*:*:*

    • Configuration RedHat 8:
  • cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 9:
  • cpe:/a:redhat:enterprise_linux:8::crb:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:gnu:grub2:-:*:*:*:*:*:*:*
  • AND
  • cpe:/a:ibm:qradar_security_information_and_event_manager:7.3.0:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:qradar_security_information_and_event_manager:7.4.0:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:8018
    P
    		groovy-lib-2.4.21-150200.3.7.4 on GA media (Moderate)
    2023-06-20
    oval:org.opensuse.security:def:7519
    P
    		grub2-2.06-150500.27.4 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:93318
    P
    		 (Important)
    2022-07-14
    oval:org.opensuse.security:def:3480
    P
    		ecryptfs-utils-103-8.3.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3570
    P
    		libXvnc1-1.6.0-22.7.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:94682
    P
    		libpango-1_0-0-1.50.4-150400.1.5 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94573
    P
    		grub2-2.06-150400.9.9 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95110
    P
    		grub2-x86_64-xen-2.06-150400.9.9 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:2943
    P
    		grub2-2.06-150400.9.9 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:75
    P
    		grub2-2.04-20.4 on GA media (Moderate)
    2022-06-13
    oval:org.opensuse.security:def:93165
    P
    		 (Moderate)
    2022-03-04
    oval:org.opensuse.security:def:99208
    P
    		 (Important)
    2022-02-04
    oval:org.opensuse.security:def:112366
    P
    		grub2-2.06-7.1 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:105877
    P
    		Security update for postgresql10 (Important)
    2021-12-14
    oval:org.opensuse.security:def:102219
    P
    		Security update for libvirt (Moderate)
    2021-11-05
    oval:org.opensuse.security:def:99405
    P
    		 (Important)
    2021-08-17
    oval:org.opensuse.security:def:63331
    P
    		grub2-x86_64-xen-2.04-20.4 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:101395
    P
    		redis-6.0.10-1.7.1 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:2242
    P
    		grub2-x86_64-xen-2.04-20.4 on GA media (Moderate)
    2021-08-10
    oval:org.opensuse.security:def:1004
    P
    		grub2-2.04-20.4 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:100851
    P
    		grub2-2.04-20.4 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:71834
    P
    		grub2-2.04-20.4 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:62093
    P
    		grub2-2.04-20.4 on GA media (Moderate)
    2021-08-09
    oval:com.redhat.rhsa:def:20212566
    P
    		RHSA-2021:2566: fwupd security update (Moderate)
    2021-06-29
    oval:com.redhat.rhsa:def:20211734
    P
    		RHSA-2021:1734: shim security update (Moderate)
    2021-05-18
    oval:org.opensuse.security:def:111284
    P
    		Security update for grub2 (Important)
    2021-03-22
    oval:org.opensuse.security:def:30034
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:57174
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:84277
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:41346
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:45776
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:117575
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:9854
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:92258
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:102789
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:com.redhat.rhsa:def:20210696
    P
    		RHSA-2021:0696: grub2 security update (Moderate)
    2021-03-02
    oval:org.opensuse.security:def:5958
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:69107
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:33090
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:59599
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:86731
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:24029
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:54769
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:82153
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:127227
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:108885
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:73781
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:93012
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:97256
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:9097
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:70353
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:100115
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:89254
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:31351
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:57561
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:84735
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:21419
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:51172
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:95506
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:118551
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:10213
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:92455
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:com.redhat.rhsa:def:20210699
    P
    		RHSA-2021:0699: grub2 security update (Moderate)
    2021-03-02
    oval:org.opensuse.security:def:69599
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:33776
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:59857
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:87554
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:28946
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:55302
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:82686
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:109455
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:76115
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:97257
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:9459
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:70545
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:64659
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:89512
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:31738
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:58090
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:85815
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:23184
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:51741
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:96099
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:125662
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:10405
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:92654
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:8710
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:69795
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:99604
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:34034
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:60467
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:88257
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:29479
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:55857
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:83241
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:40242
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:44672
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:97258
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:9655
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:92063
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:67047
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:99013
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:32267
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:58913
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:86202
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:23753
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:52017
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:81113
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:126830
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:108061
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:92853
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:8902
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:69994
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:99803
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:34644
    P
    		Security update for grub2 (Important)
    2021-03-02
    oval:org.opensuse.security:def:88574
    P
    		Security update for grub2 (Important)
    2021-03-02
    BACK
    gnu grub2 *
    redhat enterprise linux server aus 7.2
    redhat enterprise linux workstation 7.0
    redhat enterprise linux 7.0
    redhat enterprise linux server aus 7.3
    redhat enterprise linux server aus 7.4
    redhat enterprise linux server tus 7.4
    redhat enterprise linux server tus 7.6
    redhat enterprise linux server eus 7.6
    redhat enterprise linux server aus 7.6
    redhat enterprise linux 8.0
    redhat enterprise linux server aus 7.7
    redhat enterprise linux server aus 8.2
    redhat enterprise linux server eus 7.7
    redhat enterprise linux server eus 8.1
    redhat enterprise linux server tus 7.7
    redhat enterprise linux server tus 8.2
    fedoraproject fedora 33
    fedoraproject fedora 34
    netapp ontap select deploy administration utility -
    gnu grub2 -
    ibm qradar security information and event manager 7.3.0
    ibm qradar security information and event manager 7.4.0