CVE-2021-33200

CVSS V2 High 7.2 CVSS V3 High 7.8

Description

kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner case where the off reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.

Overview

CVE ID
CVE-2021-33200

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2021-05-27T13:15:08

Last Modified Date
2023-02-24T18:41:41

Weakness Enumerations

CWE	URL
CWE-787	http://cwe.mitre.org/data/definitions/787.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version End
		AND
cpe:2.3:o:linux:linux_kernel::::::::	1	OR	5.12.7
		AND
cpe:2.3:o:fedoraproject:fedora:33:::::::*	1	OR
cpe:2.3:o:fedoraproject:fedora:34:::::::*	1	OR
		AND
cpe:2.3:a:netapp:cloud_backup:-:::::::*	1	OR
cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:::::::*	1	OR
cpe:2.3:a:netapp:solidfire_baseboard_management_controller:-:::::::*	1	OR
		AND
cpe:2.3:o:netapp:h300s_firmware:-:::::::*	1	OR
cpe:2.3:h:netapp:h300s:-:::::::*	0	OR
		AND
cpe:2.3:o:netapp:h500s_firmware:-:::::::*	1	OR
cpe:2.3:h:netapp:h500s:-:::::::*	0	OR
		AND
cpe:2.3:o:netapp:h300e_firmware:-:::::::*	1	OR
cpe:2.3:h:netapp:h300e:-:::::::*	0	OR
		AND
cpe:2.3:o:netapp:h500e_firmware:-:::::::*	1	OR
cpe:2.3:h:netapp:h500e:-:::::::*	0	OR
		AND
cpe:2.3:o:netapp:h700e_firmware:-:::::::*	1	OR
cpe:2.3:h:netapp:h700e:-:::::::*	0	OR
		AND
cpe:2.3:o:netapp:h410s_firmware:-:::::::*	1	OR
cpe:2.3:h:netapp:h410s:-:::::::*	0	OR
		AND
cpe:2.3:o:netapp:h700s_firmware:-:::::::*	1	OR
cpe:2.3:h:netapp:h700s:-:::::::*	0	OR

CVSS Version 2

Version
2.0

Vector String
AV:L/AC:L/Au:N/C:C/I:C/A:C

Access Vector
LOCAL

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
COMPLETE

Integrity Impact
COMPLETE

Availability Impact
COMPLETE

Base Score
7.2

Severity
HIGH

Exploitability Score
3.9

Impact Score
10

CVSS Version 3

Version
3.1

Vector String
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL

Attack Compatibility
LOW

Privileges Required
LOW

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
7.8

Base Severity
HIGH

Exploitability Score
1.8

Impact Score
5.9

References

Reference URL	Reference Tags
https://www.openwall.com/lists/oss-security/2021/05/27/1	Mailing List Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JJCABL43FT3FKRX5DBPZG25FNKR6CEK4/	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7LR3OKKPHIBGOMHN476CMLW2T7UG53QX/
https://security.netapp.com/advisory/ntap-20210706-0004/

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-33200
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33200

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 07:08:54				Added to TrackCVE
2022-12-05 03:09:06	2021-05-27T13:15Z	2021-05-27T13:15:08	CVE Published Date	updated
2022-12-05 03:09:06		2022-05-13T20:47:33	CVE Modified Date	updated
2022-12-05 03:09:06		Analyzed	Vulnerability Status	updated
2023-02-23 17:11:22	Analyzed	Undergoing Analysis	Vulnerability Status	updated
2023-02-24 19:11:54		2023-02-24T18:41:41	CVE Modified Date	updated
2023-02-24 19:11:54	Undergoing Analysis	Analyzed	Vulnerability Status	updated