CVE-2021-3864
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-3864
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3864.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-3864
- Downstream
- Published
- 2022-08-26T16:15:09Z
- Modified
- 2025-08-09T19:01:27Z
- Severity
-
- 7.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- 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.
- References
-
- https://access.redhat.com/security/cve/CVE-2021-3864
- https://bugzilla.redhat.com/show_bug.cgi?id=2015046
- https://security-tracker.debian.org/tracker/CVE-2021-3864
- https://www.openwall.com/lists/oss-security/2021/10/20/2
- https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/
- https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/
- https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/