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.

Bugs

• <https://bugzilla.redhat.com/show_bug.cgi?id=2015046&gt;
• <https://bugzilla.suse.com/show_bug.cgi?id=1191281&gt;

Notes