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Some notes about how TLS v1.2 (Transport Layer Security) works. The goal explain what is going on in a network traffic dump, the role of the different TLS extensions, the impact of the different cipher suites on security, etc. It includes several diagrams and many references.
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The Diffie-Hellman (DH) key exchange (and variants thereof) is widely used in many protocols (such as TLS, SSH, IKE (IPSec), Signal, etc.) to bootstrap some symmetric key material which may then be used to secure communication channel between two parties. This introduction focuses on the different ways the DH key exchange is used in practice in several protocols (especially TLS) and the impact of these different approaches on the security. This is intended as a prelude for the upcoming next episodes about how TLS works.
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Manually inspecting the content of a French COVID-19 vaccination certificate QR code. The main intent is to show with a concrete example which data is actually included in the certificate.
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I found a cross-origin/same-site request forgery vulnerability in chromedriver. It was rejected (won't fix) because it is only possible to trigger this from the cross-origin/same-site and not cross-site. In practice, it means it is really only possible to trigger this from another localhost-bound web application.
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A Cross-Site Request Forgery (CSRF) vulnerability I found in GeckoDriver which could be used to execute arbitrary shell commands. CVE-2020-15660 has been assigned to this vulnerability. This was fixed by GeckoDriver v0.27.0 in 2020-07-27. This is bug #1648964.
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GUPnP, a GNOME library for Universal Plug and Play (UPnP), was vulnerable to DNS rebinding attacks. This is CVE-2021-33516 and GUPnP issue #24. This was fixed in GUPnP 1.0.7 and GUPnP 1.2.5.
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I found that pupnp was vulnerable to DNS rebinding attacks. npupnp, a fork a pupnp, was impacted as well. This is demonstrated using Gerbera a UPnP MediaServer.
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A quick summary about how DNS rebinding attacks work. The main motivation for this post is to have a diagram to show when explaining DNS-rebinding attacks.
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Some notes about using the TUN/TAP interface, especially on Linux.
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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.
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