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CVE-2021-3864

UNKNOWN
Published 2022-08-26T15:25:39
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No CVSS data available

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-9682-f2fr-3h46

Advisory Details

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.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-3864
WEB https://access.redhat.com/security/cve/CVE-2021-3864
WEB https://bugzilla.redhat.com/show_bug.cgi?id=2015046
WEB https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com
WEB https://lore.kernel.org/all/[email protected]
WEB https://lore.kernel.org/all/20211226150310.GA992%401wt.eu
WEB https://lore.kernel.org/all/[email protected]
WEB https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com
WEB https://lore.kernel.org/lkml/[email protected]
WEB https://security-tracker.debian.org/tracker/CVE-2021-3864
WEB https://www.openwall.com/lists/oss-security/2021/10/20/2

Advisory provided by GitHub Security Advisory Database. Published: August 27, 2022, Modified: September 2, 2022

References

https://www.openwall.com/lists/oss-security/2021/10/20/2
https://bugzilla.redhat.com/show_bug.cgi?id=2015046
https://access.redhat.com/security/cve/CVE-2021-3864
https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/
https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/
https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/
https://security-tracker.debian.org/tracker/CVE-2021-3864
Published: 2022-08-26T15:25:39
Last Modified: 2024-08-03T17:09:09.586Z
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