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Bzrtp library versions 1.0.x before 1.0.4 fail to perform an HVI (Hash Value Identifier) check upon reception of a DHPart2 packet during the ZRTP key agreement protocol. This omission allows an attacker in a man-in-the-middle position to spoof legitimate parties by injecting or modifying DHPart2 packets, undermining the authentication of the key exchange process.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a comprehensive proof-of-concept (PoC) for CVE-2016-6271, a vulnerability in the libbzrtp ZRTP library by Belledonne Communications. The exploit demonstrates a man-in-the-middle (MITM) attack on the ZRTP key exchange protocol due to missing hash-commitment verification, allowing an attacker to brute-force the Short Authentication String (SAS) and intercept secure media streams. The repository is structured into two main components: - `vulnerable-bzrtp/`: Contains a Dockerfile and C code to build a vulnerable ZRTP agent, simulating endpoints Alice and Bob. - `mitm-bzrtp/`: Contains a Dockerfile, a Python3 MITM attack script (`attack.py`), a C-based SAS bruteforcer (`bruteforce.c`), and a Python ZRTP protocol implementation. This component acts as Mallory, the attacker. A Docker Compose YAML file (`cve-2016-6271.yaml`) orchestrates the setup, creating isolated networks and assigning static IPs to Alice, Bob, and Mallory. The MITM attack is performed by intercepting and manipulating ZRTP packets between Alice and Bob, brute-forcing the SAS to match on both sides, and relaying traffic to demonstrate interception and potential tampering of SRTP keying material. The exploit is operational and demonstrates the full attack chain in a controlled environment, making it a valuable resource for understanding and testing the impact of CVE-2016-6271.
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