VAR-201411-0113

Vulnerability from variot - Updated: 2025-04-13 23:26

Multiple cross-site request forgery (CSRF) vulnerabilities in ZTE ZXDSL 831CII allow remote attackers to hijack the authentication of administrators for requests that (1) change the admin user name or (2) conduct cross-site scripting (XSS) attacks via the sysUserName parameter in a save action to adminpasswd.cgi or (3) change the admin user password via the sysPassword parameter in a save action to adminpasswd.cgi. The ZTE 831CII is a router device. 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. Other attacks are also possible. ZTE ZXDSL 831CII is an ADSL modem (Modem) product of China ZTE Corporation (ZTE). The vulnerability comes from the fact that the adminpasswd.cgi file does not fully filter the 'sysUserName' and 'sysPassword' parameters when the program executes the save operation. Hardcoded default misconfiguration - The modem comes with admin:admin user credintials.

Stored XSS - http://192.168.1.1/psilan.cgi?action=save&ethIpAddress=192.168.1.1&ethSubnetMask=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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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Events included in the timeline

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.