VAR-201412-0408
Vulnerability from variot - Updated: 2025-04-12 23:04ZTE ZXDSL 831CII has a default password of admin for the admin account, which allows remote attackers to gain administrator privileges. ZXDSL831 is an ADSL modem produced by ZTE Corporation. It is a modem with routing function, which can be called a cat routing machine. ZTE 831CII is prone to the following security vulnerabilities: 1. An HTML-injection vulnerability 2. A cross-site request-forgery vulnerability 3. An unspecified clickjacking vulnerability 4. An information-disclosure vulnerability 5. An unauthorized-access vulnerability Exploiting these issues may allow a remote attacker to perform certain administrative actions, execute arbitrary script or HTML code within the context of the browser, and steal cookie-based authentication credentials, gain unauthorized access, perform a man-in-the-middle attack to obtain sensitive information or compromise the affected device. Other attacks are also possible. Hardcoded default misconfiguration - The modem comes with admin:admin user credintials.
Stored XSS - http://192.168.1.1/psilan.cgi?action=saveðIpAddress=192.168.1.1ðSubnetMask=255.255.255.0&hostname=ZXDSL83C1II&domainname=home%27;alert%280%29;//&enblUpnp=1&enblLan2=0 Any user browsing to http://192.168.1.1/main.html will have a stored xss executed!
CSRF based Stored XSS - http://192.168.1.1/adminpasswd.cgi?action=save&sysUserName=%27;alert%280%29;//&sysPassword=37F6E6F627B6 - letting an admin visit this link would result the admin username changed to ';alert(0);// also a stored XSS in the home page.
CSRF - there is no token/capcha or even current password prompt when the admin changes the password, and creditintials are sent over GET. PoC: http://192.168.1.1/adminpasswd.cgi?action=save&sysUserName=admin&sysPassword=F6C656269697 if an authenticated admin browses that link their credintials will become admin:yibelo
UI Redressing - The modem (like most modems) does not have a clickjacking protection. thus, can be used to modify settings, override admin accounts by a simple clickjack. forexample by using http://192.168.1.1/adminpasswd.html it is possible into tricking an admin submit a form with our credintials (since it doesn't require current password)
not using SSL - The modem does not use HTTPS, so anyone can use MiTM to sniff on going actions, possibly gain user credintials.
Unrestricted privileges - anyone who is connected to the modem with Telnet or tftp is root. simply telneting and authenticating as admin:admin and typing sh and echo $USER would prove that
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"data": "ZTE ZXDSL 831CII has a default password of admin for the admin account, which allows remote attackers to gain administrator privileges. ZXDSL831 is an ADSL modem produced by ZTE Corporation. It is a modem with routing function, which can be called a cat routing machine. ZTE 831CII is prone to the following security vulnerabilities:\n1. An HTML-injection vulnerability\n2. A cross-site request-forgery vulnerability\n3. An unspecified clickjacking vulnerability\n4. An information-disclosure vulnerability\n5. An unauthorized-access vulnerability\nExploiting these issues may allow a remote attacker to perform certain administrative actions, execute arbitrary script or HTML code within the context of the browser, and steal cookie-based authentication credentials, gain unauthorized access, perform a man-in-the-middle attack to obtain sensitive information or compromise the affected device. Other attacks are also possible. Hardcoded default misconfiguration - The modem comes with admin:admin user credintials. \n\nStored XSS - http://192.168.1.1/psilan.cgi?action=save\u0026ethIpAddress=192.168.1.1\u0026ethSubnetMask=255.255.255.0\u0026hostname=ZXDSL83C1II\u0026domainname=home%27;alert%280%29;//\u0026enblUpnp=1\u0026enblLan2=0\nAny user browsing to http://192.168.1.1/main.html will have a stored xss executed!\n\nCSRF based Stored XSS - http://192.168.1.1/adminpasswd.cgi?action=save\u0026sysUserName=%27;alert%280%29;//\u0026sysPassword=37F6E6F627B6 - letting an admin visit this link would result the admin username changed to \u0027;alert(0);// also a stored XSS in the home page. \n\nCSRF - there is no token/capcha or even current password prompt when the admin changes the password, and creditintials are sent over GET. PoC: http://192.168.1.1/adminpasswd.cgi?action=save\u0026sysUserName=admin\u0026sysPassword=F6C656269697\nif an authenticated admin browses that link their credintials will become admin:yibelo\n\nUI Redressing - The modem (like most modems) does not have a clickjacking protection. thus, can be used to modify settings, override admin accounts by a simple clickjack. forexample by using http://192.168.1.1/adminpasswd.html it is possible into tricking an admin submit a form with our credintials (since it doesn\u0027t require current password)\n\nnot using SSL - The modem does not use HTTPS, so anyone can use MiTM to sniff on going actions, possibly gain user credintials. \n\nUnrestricted privileges - anyone who is connected to the modem with Telnet or tftp is root. simply telneting and authenticating as admin:admin and typing sh and echo $USER would prove that",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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