CVE-2021-3864

CVSS V2 None CVSS V3 High 7

Description

A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants. The prerequisite is a SUID binary that sets real UID equal to effective UID, and real GID equal to effective GID. The descendant will then have a dumpable value set to 1. As a result, if the descendant process crashes and core_pattern is set to a relative value, its core dump is stored in the current directory with uid:gid permissions. An unprivileged local user with eligible root SUID binary could use this flaw to place core dumps into root-owned directories, potentially resulting in escalation of privileges.

Overview

CVE ID
CVE-2021-3864

Assigner
secalert@redhat.com

Vulnerability Status
Modified

Published Version
2022-08-26T16:15:09

Last Modified Date
2023-02-12T23:42:51

Weakness Enumerations

CWE	URL
CWE-284	http://cwe.mitre.org/data/definitions/284.html
NVD-CWE-noinfo	http://cwe.mitre.org/data/definitions/NVD-noinfo.html

CPE Configuration (Product)

CPE	Vulnerable	Operator
cpe:2.3:o:linux:linux_kernel:-:::::::*	1	OR
cpe:2.3:o:debian:debian_linux:10.0:::::::*	1	OR
cpe:2.3:o:debian:debian_linux:11.0:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux:6.0:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*	1	OR
cpe:2.3:o:redhat:enterprise_linux:9.0:::::::*	1	OR

CVSS Version 3

Version
3.1

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

Attack Vector
LOCAL

Attack Compatibility
HIGH

Privileges Required
LOW

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
7

Base Severity
HIGH

Exploitability Score
1

Impact Score
5.9

References

Reference URL	Reference Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2015046
https://www.openwall.com/lists/oss-security/2021/10/20/2
https://access.redhat.com/security/cve/CVE-2021-3864
https://security-tracker.debian.org/tracker/CVE-2021-3864
https://lore.kernel.org/all/20211221021744.864115-1-longman@redhat.com/
https://lore.kernel.org/lkml/20211228170910.623156-1-wander@redhat.com/
https://lore.kernel.org/all/20211226150310.GA992@1wt.eu/

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-3864
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3864

History

Created	Old Value	New Value	Data Type	Notes
2022-08-26 17:00:09				Added to TrackCVE
2023-02-13 01:14:00		2023-02-12T23:42:51	CVE Modified Date	updated
2023-02-13 01:14:00	Analyzed	Modified	Vulnerability Status	updated
2023-02-13 01:14:01			Weakness Enumeration	update