[exim-dev] [Bug 1925] New: Fallback to local SMTP if cannot …

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Vastaanottaja: exim-dev
Aihe: [exim-dev] [Bug 1925] New: Fallback to local SMTP if cannot get root privs
https://bugs.exim.org/show_bug.cgi?id=1925

            Bug ID: 1925
           Summary: Fallback to local SMTP if cannot get root privs
           Product: Exim
           Version: N/A
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: General execution
          Assignee: nigel@???
          Reporter: sf@???
                CC: exim-dev@???


Under linux, there are various methods to sandbox a process. To be secure, most
of them prevent the sandboxed process from gaining any additional privileges,
i.e. the no_new_privs bit is set (see man prctl). If such a process calls
/usr/lib/sendmail, the suid bit on exim won't have any effect. As a result,
mail delivery fails.

Exim should fallback to delivery by SMTP to 127.0.0.1 or via a unix domain
socket.

The problem commonly appears whith php and cgi scripts that are run via apache
httpd while the mpm-itk module is loaded. See
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=797653

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