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CVE-2021-3864
HIGH7.0
Description
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.
CVE Details
CVSS v3.1 Score7.0
SeverityHIGH
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorLOCAL
ComplexityHIGH
Privileges RequiredLOW
User InteractionNONE
Published8/26/2022
Last Modified11/21/2024
Sourcenvd
Honeypot Sightings0
Affected Products
debian:debian_linuxlinux:linux_kernelredhat:enterprise_linux
Weaknesses (CWE)
CWE-284
References
https://access.redhat.com/security/cve/CVE-2021-3864(secalert@redhat.com)
https://bugzilla.redhat.com/show_bug.cgi?id=2015046(secalert@redhat.com)
https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/(secalert@redhat.com)
https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/(secalert@redhat.com)
https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/(secalert@redhat.com)
https://security-tracker.debian.org/tracker/CVE-2021-3864(secalert@redhat.com)
https://www.openwall.com/lists/oss-security/2021/10/20/2(secalert@redhat.com)
https://access.redhat.com/security/cve/CVE-2021-3864(af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=2015046(af854a3a-2127-422b-91ae-364da2661108)
https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/(af854a3a-2127-422b-91ae-364da2661108)
https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/(af854a3a-2127-422b-91ae-364da2661108)
https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/(af854a3a-2127-422b-91ae-364da2661108)
https://security-tracker.debian.org/tracker/CVE-2021-3864(af854a3a-2127-422b-91ae-364da2661108)
https://www.openwall.com/lists/oss-security/2021/10/20/2(af854a3a-2127-422b-91ae-364da2661108)
IOC Correlations
No correlations recorded
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