CVE - CVE-2021-3864

CVE-ID
CVE-2021-3864	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://access.redhat.com/security/cve/CVE-2021-3864 URL:https://access.redhat.com/security/cve/CVE-2021-3864 MISC:https://bugzilla.redhat.com/show_bug.cgi?id=2015046 URL:https://bugzilla.redhat.com/show_bug.cgi?id=2015046 MISC:https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/ URL:https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com/ MISC:https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/ URL:https://lore.kernel.org/all/20211226150310.GA992%401wt.eu/ MISC:https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/ URL:https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com/ MISC:https://security-tracker.debian.org/tracker/CVE-2021-3864 URL:https://security-tracker.debian.org/tracker/CVE-2021-3864 MISC:https://www.openwall.com/lists/oss-security/2021/10/20/2 URL:https://www.openwall.com/lists/oss-security/2021/10/20/2
Assigning CNA
Red Hat, Inc.
Date Record Created
20211006	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20211006)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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