The sendmail server must have the debug feature disabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-4690 | GEN004620 | SV-62813r1_rule | High |
| Description |
|---|
| Debug mode is a feature present in older versions of sendmail which, if not disabled, may allow an attacker to gain access to a system through the sendmail service. |
| STIG | Date |
|---|---|
| Oracle Linux 5 Security Technical Implementation Guide | 2020-02-25 |
Details
| Check Text ( C-51683r1_chk ) |
|---|
| Check for an enabled "debug" command provided by the SMTP service. Procedure: # telnet localhost 25 debug If the command does not return a 500 error code of "command unrecognized" or a 550 error code of "access denied", this is a finding. The operating system distribution ships with sendmail Version 8.13.8 which is not vulnerable. This should never be a finding. |
| Fix Text (F-53399r1_fix) |
|---|
| Obtain and install a newer version of the SMTP service software (sendmail or Postfix) from the operating system vendor. |