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Bug #73630 Built in Webserver - overwrite $_SERVER['request_uri']
Submitted: 2016-11-30 22:24 UTC Modified: 2021-06-29 15:14 UTC
Avg. Score:3.0 ± 0.0
Reproduced:0 of 1 (0.0%)
From: rskansing at gmail dot com Assigned: cmb (profile)
Status: Closed Package: Built-in web server
PHP Version: Irrelevant OS: Ubuntu 16.04
Private report: No CVE-ID: None
 [2016-11-30 22:24 UTC] rskansing at gmail dot com
It is possible to overwrite the contents of $_REQUEST_URI with a uri longer than 16400 bytes. It allows a attacker to manipulate the global variable in unexpected ways. It has low impact as it only related to the build in server.

Test script:
Create a file named testtest1.php with the following content
<a href="<?= $_SERVER['REQUEST_URI'] ?>">Unexpected url</a>

Start the buildin php server 
php -S localhost:8090

Go to the browser and execute the following script in the console
window.location.href = (url ='http://testtest1.php:8090/overflow.php?')+("x".repeat(16400-url.length)+"//");

it changes the url to "http://testtest1:8090/overflow.php?[16365 x here][payload]

Expected result:
localhost:8090 + a long string

Actual result:


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 [2016-11-30 22:26 UTC] rskansing at gmail dot com
* testtest1.php should have been overflow.php
 [2016-11-30 23:19 UTC]
-Type: Security +Type: Bug
 [2016-11-30 23:20 UTC]
Built-in server is not a production facility.
 [2021-06-29 15:11 UTC]
-Status: Open +Status: Verified -Assigned To: +Assigned To: cmb
 [2021-06-29 15:11 UTC]
The following pull request has been associated:

Patch Name: Fix #73630: Built-in Weberver - overwrite $_SERVER['request_uri']
On GitHub:
 [2021-06-29 15:14 UTC]
-Summary: Buildin-server - Overwrite $_SERVER['request_uri'] +Summary: Built in Webserver - overwrite $_SERVER['request_uri']
 [2021-06-30 14:18 UTC]
Automatic comment on behalf of cmb69
Log: Fix #73630: Built-in Weberver - overwrite $_SERVER['request_uri']
 [2021-06-30 14:18 UTC]
-Status: Verified +Status: Closed
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