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CVE-2021-3864

7.0 · HIGH

A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants.

Published Aug 26, 2022CWE-284EPSS 0.77%

Overview

CVE-2021-3864 is a high-severity vulnerability. It was published on August 26, 2022 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/security/cve/CVE-2021-3864Refbugzilla.redhat.com/show_bug.cgi?id=2015046Reflore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/Reflore.kernel.org/all/20211226150310.GA992%401wt.eu/Reflore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/Refsecurity-tracker.debian.org/tracker/CVE-2021-3864Refwww.openwall.com/lists/oss-security/2021/10/20/2Refaccess.redhat.com/security/cve/CVE-2021-3864Refbugzilla.redhat.com/show_bug.cgi?id=2015046Reflore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3864?

CVE-2021-3864 is a high-severity vulnerability. It was published on August 26, 2022 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2021-3864?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-3864?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-3864?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3864 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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