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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-3864 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://access.redhat.com/security/cve/CVE-2021-3864 Third Party Advisory 
https://access.redhat.com/security/cve/CVE-2021-3864 Third Party Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=2015046 Issue Tracking  Patch  Third Party Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=2015046 Issue Tracking  Patch  Third Party Advisory 
https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/
https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/
https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/
https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/
https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/
https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/
https://security-tracker.debian.org/tracker/CVE-2021-3864 Third Party Advisory 
https://security-tracker.debian.org/tracker/CVE-2021-3864 Third Party Advisory 
https://www.openwall.com/lists/oss-security/2021/10/20/2 Exploit  Mailing List  Third Party Advisory 
https://www.openwall.com/lists/oss-security/2021/10/20/2 Exploit  Mailing List  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  
CWE-284 Improper Access Control Red Hat, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3864
NVD Published Date:
08/26/2022
NVD Last Modified:
11/21/2024
Source:
Red Hat, Inc.