get3.adobe.com Cross Site Scripting

2014.12.09
Credit: Yann CAM
Risk: Low
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-79

###################################################################### # Exploit Title: Adobe.com Flashplayer sub-domain Reflected XSS (RXSS) # Date: 08/12/2014 # Author: Yann CAM @ Synetis - ASafety # Vendor or Software Link: www.adobe.com # Version: / # Category: Reflected Cross Site Scripting # Google dork: # Tested on: Adobe.com Flashplayer sub-domain ###################################################################### Adobe description : ====================================================================== Adobe Systems Incorporated is a multinational computer software company. Adobe Systems headquarter is based in San Jose, California, United States. The company has historically focused upon the creation of multimedia and creativity software products, with a more-recent foray towards rich Internet application software development. It is best known for the Portable Document Format (PDF), Flash player and Adobe Creative Suite, later Adobe Creative Cloud. Vulnerability description : ====================================================================== A reflected XSS is available in the get3.adobe.com sub-domain. Through this vulnerability, an attacker could tamper with page rendering, redirect victims to fake Adobe portals, or capture Adobe's users credentials such cookies. It's also possible to forge a fake adobe's page with this XSS to provide a backdoored version of the flash plugin to users. This reflected XSS is on GET "re" variable and is not properly sanitized before being used to his page. Proof of Concept 1 : ====================================================================== A non-persistent XSS (RXSS) in "re" GET param is available in the get3.adobe.com sub-domain. Tested on Firefox 31.0. After upgrading Flashplayer with auto-update agent on Windows, a page of adobe sub-domain is automatically opened. This page is opened to check if the upgrade is successfully ; and return code of the auto-update agent is passed through "re" GET variable. This numeric return code is reinjected into the JavaScript source-code of the page and can be crafted to make an XSS. PoC: https://get3.adobe.com/fr/flashplayer/completion/aih/?exitcode=1337&re=7331;alert(/Reflected XSS - Yann CAM @ASAfety - www.synetis.com/);&type=update&appid=200 Proof of Concept 2 : ====================================================================== Session cookie can be retrive with this XSS. PoC: https://get3.adobe.com/fr/flashplayer/completion/aih/?exitcode=1337&re=7331;alert(document.cookie);&type=update&appid=200 Screenshots : ====================================================================== - http://www.asafety.fr/data/20140829-adobe-xss01.png - http://www.asafety.fr/data/20140829-adobe-xss02.png - http://www.asafety.fr/data/20140829-adobe-xss04.png Solution: ====================================================================== Fixed by Adobe PSIRT. Additional resources : ====================================================================== - https://www.adobe.com/ - https://blogs.adobe.com/psirt/ - https://helpx.adobe.com/security/acknowledgements.html - http://www.asafety.fr/actualites-news/contribution-adobe-injection-de-code-javascript-xss/ - http://www.synetis.com Report timeline : ====================================================================== 2014-08-28 : Adobe PSIRT Team alerted with details and PoC. 2014-08-30 : Adobe response and issue number affected (2985). 2014-10-28 : Vulnerability not fixed, second email to get a status. 2014-10-28 : Adobe response : still working on this issue. 2014-12-05 : Vulnerability seems to be fixed, third email to get a status. 2014-12-05 : Adobe response : case 2985 closed and acknowledgement. 2014-12-08 : Public advisory Credits : ====================================================================== 88888888 88 888 88 88 888 88 88 788 Z88 88 88.888888 8888888 888888 88 8888888. 888888. 88 88 888 Z88 88 88 88 88 88 88 8888888 88 88 88 88 88 88 88 88 888 888 88 88 88 88 88888888888 88 88 888888 88 88 88 8. 88 88 88 88 88 888 888 ,88 8I88 88 88 88 88 88 88 .88 .88 ?8888888888. 888 88 88 88888888 8888 88 =88888888 888. 88 88 www.synetis.com 8888 Consulting firm in management and information security Yann CAM - Security Consultant @ Synetis | ASafety -- SYNETIS | ASafety CONTACT: www.synetis.com | www.asafety.fr


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