Edit report at https://bugs.php.net/bug.php?id=81645&edit=1
ID: 81645
User updated by: ive_jihwan at kaist dot ac dot kr
Reported by: ive_jihwan at kaist dot ac dot kr
Summary: Integer overflow makes difference between HTTP
status line and response code
Status: Open
Type: Bug
Package: HTTP related
Operating System: Ubuntu 20.04
PHP Version: 8.0.13
Block user comment: N
Private report: N
New Comment:
There was a mistake in writing a report, During all of report, HTTP version must be missing. Thus,
Test script should be changed to
<?php
header("HTTP/ 4294967496 aaa");
and actual result from raw response message also must be changed to
HTTP/ 4294967496 aaa
Date: Sun, 21 Nov 2021 05:39:04 GMT
Connection: close
X-Powered-By: PHP/8.0.13
Content-type: text/html; charset=UTF-8
Previous Comments:
------------------------------------------------------------------------
[2021-11-21 05:51:19] ive_jihwan at kaist dot ac dot kr
Description:
------------
There is a special feature in header() function that updates both HTTP status line and response code
when the input is starts with "HTTP/" (case insensitive),
header() function tries to parse the new HTTP status code from input string by calling atoi() from
the first non-whitespace substring after string "HTTP/". And updates the response code as
atoi()'s result, and copies the HTTP status line to the raw response without any validation.
https://github.com/php/php-src/blob/master/main/SAPI.c#L550
This can cause following two problems.
1. Very wrong format of HTTP status line (which can cause variant problems in browsers)
2. Mismatch of the SAPI response code and HTTP status line due to the overflow of atoi
Test script:
---------------
<?php
header("HTTP/1.1 4294967496 aaa");
Expected result:
----------------
header() should be failed
Actual result:
--------------
(built-in PHP server)
[Sun Nov 21 05:39:04 2021] 127.0.0.1:43808 [200]: GET /sc
[Sun Nov 21 05:39:04 2021] 127.0.0.1:43808 Closing
(Raw HTTP response message)
HTTP/1.1 4294967496 aaa
Date: Sun, 21 Nov 2021 05:39:04 GMT
Connection: close
X-Powered-By: PHP/8.0.13
Content-type: text/html; charset=UTF-8
(curl)
$ curl localhost:1234/sc.php
curl: (1) Unsupported HTTP version in response
(Chrome)
https://imgur.com/a/DQT8qqZ
(Firefox)
https://imgur.com/naIbwVV
(Safari)
https://imgur.com/gtADjss
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Edit this bug report at https://bugs.php.net/bug.php?id=81645&edit=1