Presented at
DEF CON 31 (2023),
Aug. 11, 2023, 1:30 p.m.
(45 minutes).
Firmware and software binaries are littered with private keys, legitimate CA-blessed certificates, and encryption keys—but hardly anyone notices. These secrets are often obfuscated or otherwise hidden in ways that weren’t intended to be found. I’ll show three real-world examples from popular manufacturers (Netgear, Fortinet and Dell), and demonstrate techniques for uncovering them. In the most extreme example, an adversary can use an obfuscated key to gain access to any customer’s vCenter environment.
I’ll start with a straightforward look at Netgear firmware and show methods for discovering private keys in PEM-encoded text files. We’ll dig into the Fortinet firmware, which contained custom obfuscated archive files, and show how to extract Apple and Google issued certificates and I will also show that 3 year awaited “fix” did not adequately solve the issue.
Finally, I’ll dig into the worst case: a static AES encryption key within Dell software used to connect to vCenter. I'll demonstrate how retrieve, decompile and use a static AES key which will decrypt vCenter credentials. The key is the same for EVERY customer. This has not been talked about anywhere publicly.
I’ll conclude by discussing the importance of developer training, proper key management, and (above all), identifying and eliminating this systemic practice.
REFERENCES:
* https://starkeblog.com/netgear/tls/private-key/2020/01/19/netgear-signed-tls-private-key-disclosure.html - Nick Starke and Tom Pohl
* https://www.fortiguard.com/psirt/FG-IR-20-014 - Tom Pohl
Presenters:
-
Tom Pohl
- Principal Consultant and the Penetration Testing Team Manager at LMG Security
Tom Pohl is a Principal Consultant and Penetration Testing Team Manager at LMG Security. Prior to LMG, he has spent most of his career on the blue team building and securing systems used by millions of people. And by night, he is a competitive CTF player and has won several black/gold badges including THOTCON, Circle City Con, Wild West Hackin’ Fest and DEF CON. He is good at what he does because he’s already made many of the mistakes that he encounters in client environments on a daily basis.
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