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Avast Antivirus X.509 Error Rendering Command Execution Exploit
[Source: https://code.google.com/p/google-security-research/issues/detail?id=546 Avast will render the commonName of X.509 certificates into an HTMLLayout frame when your MITM proxy detects a bad signature. Unbelievably, this means CN="<h1>really?!?!?</h1>" actually works, and is pretty simple to convert into remote code execution. To verify this bug, I've attached a demo certificate for you. Please find attached key.pem, cert.pem and cert.der. Run this command to serve it from a machine with openssl: $ sudo openssl s_server -key key.pem -cert cert.pem -accept 443 Then visit that https server from a machine with Avast installed. Click the message that appears to demonstrate launching calc.exe. Proof of Concept: https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/38384.zip # 0day.today [2024-11-15] #