cvelistv5 - cve-2021-3864

cve-2021-3864

Vulnerability from cvelistv5

Published

2022-08-26 15:25

Modified

2024-08-03 17:09

Severity ?

Summary

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.

References

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

Impacted products

▼	Vendor	Product
	n/a	kernel

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

cve-2021-3864

Vulnerability from cvelistv5

gsd-2021-3864

Vulnerability from gsd

wid-sec-w-2022-1257

Vulnerability from csaf_certbund

ghsa-9682-f2fr-3h46

Vulnerability from github

Tags

Sightings

Nomenclature