Sec Bug->Bug #81523 [Opn]: The search bar in your site no contains atributte "maxlenght"
| From: | stas@php.net | Date: | Wed, 24 May 2023 06:56:16 +0000 |
| Subject: | Sec Bug->Bug #81523 [Opn]: The search bar in your site no contains atributte "maxlenght" | ||
| References: | 1 | Groups: | php.webmaster |
| Request: | Send a blank email to php-webmaster+get-30849@lists.php.net to get a copy of this message | ||
Edit report at https://bugs.php.net/bug.php?id=81523&edit=1
ID: 81523
Updated by: stas@php.net
Reported by: neibase123 at gmail dot com
Summary: The search bar in your site no contains atributte
"maxlenght"
Status: Open
-Type: Security
+Type: Bug
Package: Website problem
Operating System: irrelevante
PHP Version: Irrelevant
Block user comment: N
Private report: N
Previous Comments:
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[2023-05-24 06:32:09] tradingstatsf at gmail dot com
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[2021-10-14 10:06:04] cmb@php.net
The missing maxlength attribute is certainly not a security issue,
since a client can ignore that. Not restricting the length
server-side, however, might be an issue in this case.
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[2021-10-13 17:06:11] neibase123 at gmail dot com
Description:
------------
Your site's search bar doesn't contain the "maxlength" html attribute, I enter
an absurd amount of characters, if your server doesn't filter these characters, they can cause
a Denial Of Service attack
Test script:
---------------
#this script works on any page on the site that contains the search bar.
# please in console navigator paste lines one for one
# tested in https://www.php.net/
document.getElementsByName("pattern")[0].value = "A".repeat(10000000)
document.getElementsByName("pattern")[0].value;
Expected result:
----------------
Demonstrate how it can set a huge value in the search bar, if the attacker enters and your server
doesn't filter these characters, they can cause a DOS attack
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Edit this bug report at https://bugs.php.net/bug.php?id=81523&edit=1