The sendmail server must have the debug feature disabled.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000366

SV-62813r1_rule The sendmail server must have the debug feature disabled.

Vulnerability discussion

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.

Check content

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

Obtain and install a newer version of the SMTP service software (sendmail or Postfix) from the operating system vendor.

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