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Improving serialization regexes, fixing excavate bug, excavate tests #1047

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Feb 1, 2024
Merged

Improving serialization regexes, fixing excavate bug, excavate tests #1047

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14 changes: 8 additions & 6 deletions bbot/modules/internal/excavate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,8 +21,8 @@ def __init__(self, excavate):
async def search(self, content, event, **kwargs):
results = set()
async for result, name in self._search(content, event, **kwargs):
results.add(result)
for result in results:
results.add((result, name))
for result, name in results:
await self.report(result, name, event, **kwargs)

async def _search(self, content, event, **kwargs):
Expand Down Expand Up @@ -254,13 +254,15 @@ async def report(self, result, name, event, **kwargs):
class SerializationExtractor(BaseExtractor):
regexes = {
"Java": r"(?:[^a-zA-Z0-9+/]|^)(rO0[a-zA-Z0-9+/]+={,2})",
".NET": r"AAEAAAD//[a-zA-Z0-9+/]+={,2}",
"PHP": r"YTo[xyz0123456][a-zA-Z0-9+/]+={,2}",
"Possible Compressed": r"H4sIAAAAAAAA[a-zA-Z0-9+/]+={,2}",
".NET": r"(?:[^a-zA-Z0-9+/]|^)(AAEAAAD//[a-zA-Z0-9+/]+={,2})",
"PHP (Array)": r"(?:[^a-zA-Z0-9+/]|^)(YTo[xyz0123456][a-zA-Z0-9+/]+={,2})",
"PHP (String)": r"(?:[^a-zA-Z0-9+/]|^)(czo[xyz0123456][a-zA-Z0-9+/]+={,2})",
"PHP (Object)": r"(?:[^a-zA-Z0-9+/]|^)(Tzo[xyz0123456][a-zA-Z0-9+/]+={,2})",
"Possible Compressed": r"(?:[^a-zA-Z0-9+/]|^)(H4sIAAAAAAAA[a-zA-Z0-9+/]+={,2})",
}

async def report(self, result, name, event, **kwargs):
description = f"{name} serialized object found"
description = f"{name} serialized object found: [{self.excavate.helpers.truncate_string(result,2000)}]"
await self.excavate.emit_event(
{"host": str(event.host), "url": event.data.get("url"), "description": description}, "FINDING", event
)
Expand Down
38 changes: 38 additions & 0 deletions bbot/test/test_step_2/module_tests/test_module_excavate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -280,3 +280,41 @@ async def setup_before_prep(self, module_test):
def check(self, module_test, events):
assert any(e.data == "asdffoo.test.notreal" for e in events)
assert any(e.data == "https://asdffoo.test.notreal/some/path" for e in events)


class TestExcavateSerializationNegative(TestExcavate):
async def setup_before_prep(self, module_test):
module_test.httpserver.expect_request("/").respond_with_data(
"<html><p>llsdtVVFlJxhcGGYTo2PMGTRNFVKZxeKTVbhyosM3Sm/5apoY1/yUmN6HVcn+Xt798SPzgXQlZMttsqp1U1iJFmFO2aCGL/v3tmm/fs7itYsoNnJCelWvm9P4ic1nlKTBOpMjT5B5NmriZwTAzZ5ASjCKcmN8Vh=</p></html>"
)

def check(self, module_test, events):
assert not any(e.type == "FINDING" for e in events), "Found Results without word boundary"


class TestExcavateSerializationPositive(TestExcavate):
async def setup_before_prep(self, module_test):
module_test.httpserver.expect_request("/").respond_with_data(
"""<html>
<h1>.NET</h1>
<p>AAEAAAD/////AQAAAAAAAAAMAgAAAFJTeXN0ZW0uQ29sbGVjdGlvbnMuR2VuZXJpYy5MaXN0YDFbW1N5c3RlbS5TdHJpbmddXSwgU3lzdGVtLCBWZXJzaW9uPTQuMC4wLjAsIEN1bHR1cmU9bmV1dHJhbCwgUHVibGljS2V5VG9rZW49YjAzZjVmN2YxMWQ1MGFlMwEAAAAIQ29tcGFyZXIQSXRlbUNvdW50AQMAAAAJAwAAAAlTeXN0ZW0uU3RyaW5nW10FAAAACQIAAAAJBAAAAAkFAAAACRcAAAAJCgAAAAkLAAAACQwAAAAJDQAAAAkOAAAACQ8AAAAJEAAAAAkRAAAACRIAAAAJEwAAAA==</p>
<h1>Java</h1>
<p>rO0ABXQADUhlbGxvLCB3b3JsZCE=</p>
<h1>PHP (string)</h1>
<p>czoyNDoiSGVsbG8sIHdvcmxkISBNb3JlIHRleHQuIjs=</p>
<h1>PHP (array)</h1>
<p>YTo0OntpOjA7aToxO2k6MTtzOjE0OiJzZWNvbmQgZWxlbWVudCI7aToyO2k6MztpOjM7czoxODoiTW9yZSB0ZXh0IGluIGFycmF5Ijt9</p>
<h1>PHP (object)</h1>
<p>TzoxMjoiU2FtcGxlT2JqZWN0IjoyOntzOjg6InByb3BlcnR5IjtzOjEzOiJJbml0aWFsIHZhbHVlIjtzOjE2OiJhZGRpdGlvbmFsU3RyaW5nIjtzOjIxOiJFeHRyYSB0ZXh0IGluIG9iamVjdC4iO30=</p>
<h1>Compression</h1>
<p>H4sIAAAAAAAA/yu2MjS2UvJIzcnJ11Eozy/KSVFUsgYAZN5upRUAAAA=</p>
</html>
"""
)

def check(self, module_test, events):

for serialize_type in ["Java", ".NET", "PHP (Array)", "PHP (String)", "PHP (Object)", "Possible Compressed"]:
assert any(
e.type == "FINDING" and serialize_type in e.data["description"] for e in events
), f"Did not find {serialize_type} Serialized Object"
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