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Failed to load any python extension

Thomas | Last updated: Sep 06, 2018 03:40PM UTC

Hi! I have a problem with loading any python base extension in burp. I downloaded a jyton-standalone-2.7.0.jar and also configured python environment in extender options but when I want to install any python base extension via BApp Store I get error in the bottom right corrner "Failde to load BApp". I am using java in version - jdk-9.0.4 (burp is working fine). Does anyone know where the error may be?

Liam, PortSwigger Agent | Last updated: Sep 06, 2018 04:38PM UTC

Are you able to load other python based extensions?

Burp User | Last updated: Sep 07, 2018 07:32AM UTC

I tried serveral different extensions (Active Scan ++, Add & Track Custom Issues, Identity Crisis) but with not success. I am using burp in version 1.7.37.

Liam, PortSwigger Agent | Last updated: Sep 07, 2018 08:04AM UTC

Have you tried following our support page for installing an extension? - https://support.portswigger.net/customer/portal/articles/1965930-how-to-install-an-extension-in-burp-suite

Burp User | Last updated: Sep 07, 2018 08:42AM UTC

Yes, off course I tried it. What is more, when I check Errors tab in Burp Extensions I get the following Traceback: Traceback (most recent call last): File "C:\work\programs\Jython\jython-standalone-2.7.0.jar\Lib\site.py", line 585, in <module> File "C:\work\programs\Jython\jython-standalone-2.7.0.jar\Lib\site.py", line 567, in main File "C:\work\programs\Jython\jython-standalone-2.7.0.jar\Lib\site.py", line 300, in addusersitepackages File "C:\work\programs\Jython\jython-standalone-2.7.0.jar\Lib\site.py", line 289, in getusersitepackages File "C:\work\programs\Jython\jython-standalone-2.7.0.jar\Lib\sysconfig.py", line 416, in get_path File "C:\work\programs\Jython\jython-standalone-2.7.0.jar\Lib\sysconfig.py", line 407, in get_paths File "C:\work\programs\Jython\jython-standalone-2.7.0.jar\Lib\sysconfig.py", line 180, in _expand_vars File "C:\work\programs\Jython\jython-standalone-2.7.0.jar\Lib\sysconfig.py", line 154, in _subst_vars File "C:\work\programs\Jython\jython-standalone-2.7.0.jar\Lib\sysconfig.py", line 154, in _subst_vars UnicodeEncodeError: 'ascii' codec can't encode character u'\u0142' in position 13: ordinal not in range(128) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at burp.mke.<init>(Unknown Source) at burp.igf.a(Unknown Source) at burp.d1e.a(Unknown Source) at burp.d1e.a(Unknown Source) at burp.gzc.run(Unknown Source) at java.lang.Thread.run(Thread.java:745)

PortSwigger Agent | Last updated: Sep 07, 2018 08:44AM UTC

Hi Thomas, Thanks for providing the stack trace. It shows Jython throwing a Unicode exception when it's trying to load your user site packages. I wonder, does your user name include a non-ASCII character? You may have discovered a Jython bug here. Let us know as if that is the problem we may be able to identify a workaround, such as setting the USER_SITE environment variable to a path that only contains ASCII characters. Please let us know if you need any further assistance.

Burp User | Last updated: Sep 07, 2018 10:48AM UTC

Yes you are rigth, my user name include non-ASCII character

PortSwigger Agent | Last updated: Sep 07, 2018 10:51AM UTC

Hi Thomas, Ok, I've just checked to see if I can find a workaround for this issue, but have not been successful. I think the only way you'll get Jython extensions to work is to rename your user account to contain only ASCII characters. It might be worth reporting to Jython. Some quick searching revealed some similar issues, although the project has not done a release for some time. Please let us know if you need any further assistance.

Burp User | Last updated: Sep 07, 2018 02:20PM UTC