CVE-2021-3864

Katalog CVE

CVSS 7.0 · High EPSS 0,77%

Kerentanan Improper Access Control pada linux kernel, debian linux +1 lainnya. Skor CVSS 3.1 7.0 (High) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

26 Agustus 2022

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

7.0 (High), sumber NVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-284: Improper Access Control

EPSS (30 hari)

0,77% peluang dieksploitasi; lebih tinggi dari 54,4% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://bugzilla.redhat.com/show_bug.cgi?id=2015046 issue tracking · patch · advisory pihak ketiga
• https://access.redhat.com/security/cve/CVE-2021-3864 advisory pihak ketiga
• https://security-tracker.debian.org/tracker/CVE-2021-3864 advisory pihak ketiga
• https://www.openwall.com/lists/oss-security/2021/10/20/2 exploit · mailing list · advisory pihak ketiga
• 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/