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The sendmail server must have the debug feature disabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-4690 | GEN004620 | SV-37508r1_rule | ECSC-1 | 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 |
|---|---|
| Red Hat Enterprise Linux 5 Security Technical Implementation Guide | 2016-12-16 |
Details
| Check Text ( C-36167r2_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 RHEL distribution ships with sendmail Version 8.13.8 which is not vulnerable. This should never be a finding. |
| Fix Text (F-31418r1_fix) |
|---|
| Obtain and install a newer version of the SMTP service software (sendmail or Postfix) from RedHat. |