InformationAlthough the useradd program will not let you create a duplicate User ID (UID), it is possible for an administrator to manually edit the /etc/passwd file and change the UID field.
Users must be assigned unique UIDs for accountability and to ensure appropriate access protections.
SolutionBased on the results of the audit script, establish unique UIDs and review all files owned by the shared UIDs to determine which UID they are supposed to belong to.
MITRE ATT&CK Mappings:
Techniques / Sub-techniques
T1078, T1078.001, T1078.003