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GHSA-95m2-chm4-mq7m
No affected components available
Details
Persistent XSS vulnerability in image link handling of PHP-Textile versions 4.1.2 and older, when running the parser in restricted mode. In restricted mode it is expected that the input would be sanitized, allowing user-input (such as user comments) to be parsed and handled safely by the PHP-Textile library.
In restricted mode, the version 4.1.2 of the library does not sanitize or validate user-controllable href input in image links, but allows any link protocol or JavaScriptt links to be used. The vulnerability allows an attacker to add malicious JavaScript code to the page which is then executed when an unexpecting user clicks the link.
In non-restricted mode, the library allows mixed HTML input, and any link protocol by design. In restricted mode, text links were already handled correctly and the vulnerability only affects image links.
Resolution
This issue was fixed in PHP-Textile version 4.1.3. Version 4.1.3 disallows use of JavaScript in image links when the parser is ran in restricted mode. Restricted mode can be enabled with Parser::setRestricted() method prior to calling the parse method. For more information, see Parsing unstructed input in the project's README.
PoC
The following Textile input:
!securing.pl(Click Tu)!:javascript:document.innerHTML='<script>alert(1);</script>'+document.cookie)
Would render as the following HTML even in restricted mode:
<p><a href="javascript:document.innerHTML='<script>alert(1);</script>'+document.cookie"><img alt="Click Tu" src="securing.pl" title="Click Tu"></a>)</p>
Impact
The attacker can perform any operation in the application with user’s privileges or remotely control user’s browser with automated tools.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data. There is a low impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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