CVE-2021-3864

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.

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

Configuration 1

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

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Published : 2022-08-26 04:15

Updated : 2023-02-12 11:42

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NVD link : CVE-2021-3864

Mitre link : CVE-2021-3864

No products.

CWE-284