apache - Error with PHP mail(): Multiple or malformed newlines found in additional_header -

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suddenly have started receiving above error without changes having been made script.

host 1and1 (i know...)

the script still works fine on different server, , suspicion there must have been server config change has lead this, although hosts plead ignorance.

there's no information on above error @ in google can find - have ideas? server running apache if helps.

had similar problem.
came out of blue. no php code changed.

what changed: php upgraded 5.5.25-1 5.5.26.

a security risk in php mail() function has been fixed , newlines in additional_headers allowed no more. because newlines mean: starts email message (and surely don't want inject newlines through headers followed evil message).

what have worked fine, e.g. having newlines after headers or passing whole message additional_headers, function no more.

solution:

  • sanitize headers. no multiple newlines in additional_headers argument. these count "multiple or malformed newlines": \r\r, \r\0, \r\n\r\n, \n\n, \n\0.
  • use additional_headers headers only. email message (multipart or not, ir without attachments, etc) belongs in message argument, not in headers.

php security bug report: https://bugs.php.net/bug.php?id=68776
c code diff how fixed: http://git.php.net/?p=php-src.git;a=blobdiff;f=ext/standard/mail.c;h=448013a472a3466245e64b1cb37a9d1b0f7c007e;hp=1ebc8fecb7ef4c266a341cdc701f0686d6482242;hb=9d168b863e007c4e15ebe4d2eecabdf8b0582e30;hpb=eee8b6c33fc968ef8c496db8fb54e8c9d9d5a8f9


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