TUN/TAP interface (on Linux)
Published:
Some notes about using the TUN/TAP interface, especially on Linux.
Firefox DoH DNS rebinding protection bypass using IPv4-mapped addresses
Published:
I found that the filtering of private IPv4 addresses in the DNS-over-HTTPS (DoH) implementation of Firefox could by bypassed. This is CVE-2020-26961 and Mozilla bug 1672528. It has been fixed in Firefox 83, Firefox ESR 78.5 and Thunderbird 78.5.
Introduction to UPnP
Published:
This post gives simple explanations of how UPnP (Universal Plug-and-Play) works, especially with the goal of testing the security devices such as routers, smart TVs, etc.
DNS rebinding and CSRF vulnerabilites on Samsung TV DIAL implementation
Published:
I found a DNS rebinding vulnerability as well as a Cross Site Request Forgery (CSRF) vulnerability on the DIAL (Discovery And Launch) implementation of the Samsung TV UE40F6320 (v1.0), from 2011. This can be used to open any installed application (eg. Netflix and Youtube) and force the vizualisation of a given video in the applications.
DNS rebinding vulnerability in Samsung SmartTV UPnP
Published:
I found a DNS rebinding vulnerability on the Universal Plug-and-Play (UPnP) interface of the Samsung TV UE40F6320 (v1.0), from 2011. This could be used, for example, to change the channel, to know which channel is currently used or open the builtin browser to any URI.
Disable certificate verification on Android with Frida
Published:
Some notes about how to write a Frida script with the (somewhat classic) example of disabling certificate verification for TLS communications on Android applications.
DNS rebinding vulnerabilities in Freebox
Published:
I found some DNS rebinding vulnerabilities in Freebox devices (CVE-2020-24374, CVE-2020-24375, CVE-2020-24376, CVE-2020-24377) as well as a Cross Site Request Forgery (CSRF) vulnerability (CVE-2020-24373). These vulnerabilities were fixed in 2020-08-05.
GNU/Linux host name resolution
Published:
This post describes different software components involved in host name resolutions and DNS configuration on GNU/Linux systems. It consists of a diagram and some accompanying explanations. The goal is to give some pointers and references to understand how to troubleshoot host name/DNS resolution problems and configuration problems on GNU/Linux systems.
Push-to-talk in any application
Published:
Some scripts I wrote to enable system-wide push-to-talk (for X11 and PulseAudio). Some people might find it useful for the ongoing lockdown.
Systemd-resolved DNS configuration for VPN
Published:
Some guidance about configuring/fixing domain name resolution with a corporate Virtual Private Network (VPN), especially OpenVPN and with systemd-based Linux systems. This configuration uses the internal/private corporate resolvers for resolving internal/private domain names while using the ISP resolver for general domain names. This might help if your VPN is struggling these days because of the COVID-19 threat 😷.
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