7

CVE-2021-3864

Exploit
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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version-
Debian ≫ Debian Linux Version10.0
Debian ≫ Debian Linux Version11.0
Redhat ≫ Enterprise Linux Version6.0
Redhat ≫ Enterprise Linux Version7.0
Redhat ≫ Enterprise Linux Version9.0
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.73% 0.494
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7 1 5.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-284 Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

https://access.redhat.com/security/cve/CVE-2021-3864
Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2015046
Patch
Third Party Advisory
Issue Tracking
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/
https://security-tracker.debian.org/tracker/CVE-2021-3864
Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/10/20/2
Third Party Advisory
Exploit
Mailing List