useradd in shadow-utils before 4.0.3, and possibly other versions before 4.0.8, does not provide a required argument to the open function when creating a new user mailbox, which causes the mailbox to be created with unpredictable permissions and possibly allows attackers to read or modify the mailbox.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Shadow | Debian | * | 4.0.7 (including) |
| Shadow | Debian | 4.0.0 (including) | 4.0.0 (including) |
| Shadow | Debian | 4.0.1 (including) | 4.0.1 (including) |
| Shadow | Debian | 4.0.2 (including) | 4.0.2 (including) |
| Shadow | Debian | 4.0.4 (including) | 4.0.4 (including) |
| Shadow | Debian | 4.0.4.1 (including) | 4.0.4.1 (including) |
| Shadow | Debian | 4.0.5 (including) | 4.0.5 (including) |
| Shadow | Debian | 4.0.6 (including) | 4.0.6 (including) |
| Red Hat Enterprise Linux 3 | RedHat | shadow-utils-2:4.0.3-29.RHEL3 | * |
| Red Hat Enterprise Linux 4 | RedHat | shadow-utils-2:4.0.3-61.RHEL4 | * |