SynopsisThe remote host has a mail agent installed that allows remote command execution via Shellshock.
DescriptionThe remote host appears to be running a mail transfer or mail delivery agent such as Courier, Exim, Postfix, or Procmail. Many of these agents can be configured to run utility scripts for a diverse number of tasks including filtering, sorting, and delivering mail. These scripts may create the conditions that are exploitable, making the agent vulnerable to remote code execution via Shellshock.
A negative result from this plugin does not prove conclusively that the remote system is not affected by Shellshock, only that the mail agent running on the system is not configured in such a way to allow remote execution via Shellshock.
SolutionApply the referenced Bash patch.