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Extension Not Loading Due to "Stale" Reference

Michael | Last updated: Sep 28, 2017 02:42AM UTC

So I noticed the following behavior when using the Python Scripter extension: 1. Installed the extension 2. Added custom script containing error in Scripter tab 3. Closed Burp 4. Relaunched Burp and noticed the extension would no longer load as it was still referencing the script from 2. 5. Removed/reinstalled the extension, but it still referenced the script from 2 Because the extension didn't load the Scripter tab was not visible and so the error could not be addressed. See related output below: Traceback (most recent call last): File "/Users/michael/.BurpSuite/bapps/eb563ada801346e6bdb7a7d7c5c52583/burpscript.py", line 36, in registerExtenderCallbacks self._code = compile(script, '<string>', 'exec') File "<string>", line 13 for func in funcs ^ SyntaxError: mismatched input '\n' expecting COLON at org.python.core.ParserFacade.fixParseError(ParserFacade.java:95) at org.python.core.ParserFacade.parse(ParserFacade.java:205) at org.python.core.CompileFunction.compile(__builtin__.java:1672) at org.python.core.CompileFunction.compile(__builtin__.java:1648) at org.python.core.CompileFunction.__call__(__builtin__.java:1636) at org.python.core.PyObject.__call__(PyObject.java:496) at org.python.core.PyObject.__call__(PyObject.java:500) at org.python.pycode._pyx4.registerExtenderCallbacks$2(/Users/dark_knight/.BurpSuite/bapps/eb563ada801346e6bdb7a7d7c5c52583/burpscript.py:43) at org.python.pycode._pyx4.call_function(/Users/dark_knight/.BurpSuite/bapps/eb563ada801346e6bdb7a7d7c5c52583/burpscript.py) at org.python.core.PyTableCode.call(PyTableCode.java:167) at org.python.core.PyBaseCode.call(PyBaseCode.java:307) at org.python.core.PyBaseCode.call(PyBaseCode.java:198) at org.python.core.PyFunction.__call__(PyFunction.java:482) at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:237) at org.python.core.PyMethod.__call__(PyMethod.java:228) at org.python.core.PyMethod.__call__(PyMethod.java:218) at org.python.core.PyMethod.__call__(PyMethod.java:213) at org.python.core.PyObject._jcallexc(PyObject.java:3626) at org.python.core.PyObject._jcall(PyObject.java:3658) at org.python.proxies.__main__$BurpExtender$0.registerExtenderCallbacks(Unknown Source) at burp.lgc.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) How do I clean this reference?

PortSwigger Agent | Last updated: Sep 28, 2017 08:19AM UTC

Hi Michael, Thanks for your message. This appears to be a bug in Python Scripter; I will contact the extension author in due course. You can use Jython to clear the reference for now: $ java -jar jython-standalone-2.7.0.jar >>> from java.util.prefs import Preferences >>> Preferences.userRoot().node('burp/extensions/_Python Scripter').removeNode() Please let us know if you need any further assistance.

PortSwigger Agent | Last updated: Sep 28, 2017 08:44AM UTC

Hi Michael, We have applied a fix to Python Scripter so it now starts properly even if the saved script won't compile. Hope this works for you!

Burp User | Last updated: Sep 28, 2017 03:30PM UTC

Much appreciated. Regards, Michael

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