CVE-2021-3864
published 2022-08-26CVE-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…
high7CVSS 3.1
AVLACHPRLUINSUCHIHAH
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | debian_linux | — | — |
| debian | linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
CVSS provenance
nvdv3.17.0HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.0HIGH
Red Hat
kernel: descendant's dumpable setting with certain SUID binaries
vendor_redhat·2021-10-20·CVSS 7.0
CVE-2021-3864 [HIGH] kernel: descendant's dumpable setting with certain SUID binaries
kernel: descendant's dumpable setting with certain SUID binaries
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.
A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries execu
Debian
CVE-2021-3864: linux - A flaw was found in the way the dumpable flag setting was handled when certain S...
vendor_debian·2021·CVSS 7.0
CVE-2021-3864 [HIGH] CVE-2021-3864: linux - A flaw was found in the way the dumpable flag setting was handled when certain S...
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.
Scope: local
bookworm: open
bullseye: open
forky: open
sid: open
trixie: open
GHSA
GHSA-9682-f2fr-3h46: A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants
ghsa_unreviewed·2022-08-27
CVE-2021-3864 [HIGH] CWE-284 GHSA-9682-f2fr-3h46: A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants
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.
OSV
CVE-2021-3864: A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants
osv·2022-08-26·CVSS 7.0
CVE-2021-3864 [HIGH] CVE-2021-3864: A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants
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.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://access.redhat.com/security/cve/CVE-2021-3864https://bugzilla.redhat.com/show_bug.cgi?id=2015046https://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-2021-3864https://www.openwall.com/lists/oss-security/2021/10/20/2https://access.redhat.com/security/cve/CVE-2021-3864https://bugzilla.redhat.com/show_bug.cgi?id=2015046https://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-2021-3864https://www.openwall.com/lists/oss-security/2021/10/20/2
2022-08-26
Published