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IPy Blacklist Bypass

IPy Blacklist Bypass
Posted Oct 16, 2014
Authored by Nicolas Gregoire

IPy suffers from a blacklist bypass vulnerability.

tags | exploit, bypass
SHA-256 | 52330e16a8c0db217b73de740ed229579f3d9b070a700c148046face2ef36557

IPy Blacklist Bypass

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IPy is a Python "class and tools for handling of IPv4 and IPv6 addresses
and networks" (https://github.com/haypo/python-ipy). This library is
sometimes used to implement blacklists forbidding internal, private or
loopback addresses.

Using octal encoding (supported by urllib2), it is possible to bypass
checks based on the result of the iptype() function. For example, IP
address '0177.0000.0000.0001' is considered as 'PUBLIC' but resolves to
'127.0.0.1' when accessed via urllib2.

Developers were informed, no news since then... More details on my blog:
http://www.agarri.fr/kom/archives/2014/10/15/bypassing_blacklists_based_on_ipy/index.html

Cheers,
Nicolas Grégoire


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