Exploit the Fuzz – Exploiting Vulnerabilities in 5G Core Networks

Following on from our previous blog post ‘The Challenges of Fuzzing 5G Protocols’, in this post, we demonstrate how an attacker could use the results from the fuzz testing to produce an exploit and potentially gain access to a 5G core network. In this blog post we will be using the PFCP bug (CVE-2021-41794) we'd … Continue reading Exploit the Fuzz – Exploiting Vulnerabilities in 5G Core Networks

NCC Group placed first in global 5G Cyber Security Hack competition

In June of this year, Traficom - the Finnish transport and communications agency - along with the Aalto University, Cisco, Ericsson, Nokia, and PwC, organized the 5G Cyber Security Hack competition. A similar event was organised in November 2019 in Oulu, Finland and this hackathon-style event was a follow-up to their successful 2019 event. Due … Continue reading NCC Group placed first in global 5G Cyber Security Hack competition

The Challenges of Fuzzing 5G Protocols

If you have ever looked at fuzzing in any depth you will quickly realize it’s not as trivial as it first appears. There are many different types of fuzzers, but here we are focused on network fuzzers.  These fuzzers are of particular interest as they are most suited to fuzzing telecoms products/protocols, where the application … Continue reading The Challenges of Fuzzing 5G Protocols

Technical Advisory – Open5GS Stack Buffer Overflow During PFCP Session Establishment on UPF (CVE-2021-41794)

Vendor: Open5GS Vendor URL: https://github.com/open5gs/open5gs Versions affected: 1.0.0 to 2.3.3 Systems Affected: Linux Author: mark.tedman[at]nccgroup[dot]com Advisory URL / CVE Identifier: CVE-2021-41794 Risk: CVSSv3.1: 8.2 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H) Summary When connecting to the UPF port for the PFCP protocol (8805) and sending an Association Setup Request followed by a Session Establishment Request with a PDI Network Instance set … Continue reading Technical Advisory – Open5GS Stack Buffer Overflow During PFCP Session Establishment on UPF (CVE-2021-41794)

Conference Talks – September 2021

This month, members of NCC Group will be presenting their work at the following conferences: Javed Samuel, "Overview of Open-Source Cryptography Vulnerabilities", to be presented at the International Cryptographic Module Conference 2021 (Virtual - Sept 3 2021)Robert Seacord, "Secure Coding", to be presented at Auto ISAC Analysts (Virtual - Sept 7 2021)Erik Steringer, "Automating AWS … Continue reading Conference Talks – September 2021