Vonage HT802 – Multiple Vulnerabilities

I have disclosed three vulnerabilities in the Vonage (Grandstream) HT802.  I haven’t received a response from Vonage.  These vulnerabilities can be chained to inject persistent XSS in the Basic Settings screen of the device.

Update: I have the following received CVEs for these vulnerabilities:

1.) Cross-Site Request Forgery (CSRF) vulnerability in the login screen (/cgi-bin/login) allows an attacker to log into a target Vonage device. (CVE-2017-165635)

POC Verified in Firefox 56.0 on macOS

2.) Cross-Site Request Forgery (CSRF) vulnerability in the Basic Settings screen allows an attacker to modify system settings. (CVE-2017-16563)

POC Verified in Firefox 56.0 on macOS

3.) Stored Cross-site scripting (XSS) vulnerability in cgi-bin/config2 in Vonage HT802 allows remote authenticated users to inject arbitrary web script or HTML via the DHCP vendor class ID field (P148). (CVE-2017-16564)

POC Verified in Firefox 56.0 on macOS

These three vulnerabilities can be chained to inject a persistent XSS payload into the Basic Settings page.

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