Vulnerability Monitor

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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.

Published

2022-08-26T16:15:09.680

Last Modified

2024-11-21T06:22:41.197

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.0 (HIGH)

Weaknesses

Type: Primary
CWE-284
Type: Secondary
NVD-CWE-noinfo

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	linux	linux_kernel	-	Yes
Operating System	debian	debian_linux	10.0	Yes
Operating System	debian	debian_linux	11.0	Yes
Operating System	redhat	enterprise_linux	6.0	Yes
Operating System	redhat	enterprise_linux	7.0	Yes
Operating System	redhat	enterprise_linux	9.0	Yes

References

https://access.redhat.com/security/cve/CVE-2021-3864 Third Party Advisory ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=2015046 Issue Tracking, Patch, Third Party Advisory ([email protected])
https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/ ([email protected])
https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/ ([email protected])
https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/ ([email protected])
https://security-tracker.debian.org/tracker/CVE-2021-3864 Third Party Advisory ([email protected])
https://www.openwall.com/lists/oss-security/2021/10/20/2 Exploit, Mailing List, Third Party Advisory ([email protected])
https://access.redhat.com/security/cve/CVE-2021-3864 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=2015046 Issue Tracking, Patch, Third Party Advisory (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 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.openwall.com/lists/oss-security/2021/10/20/2 Exploit, Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)