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[R1] HP Operations Orchestration (HP OO) /oo/backwards-compatibility/wsExecutionBridgeService Jaa Deserialization Remote Code Execution

Critical

Synopsis

HP released HP Operations Orchestration (HP OO) 10.51 in response to CVE-2016-1997. Note that by default, HP OO’s web interface does not require authentication, at all. However, it is very simple to enable so we assumed every rational admin that deploys it immediately goes into settings and turns on authentication. Unfortunately, this is not reality as seen via Shodan where the first page of results shows an Internet-addressable server with no authentication. As such, we consider this to be unauthenticated by default, but can be downgraded to authentication-required only by user configuration. Finally, since CVE-2016-1997 specifically calls out the use of Apache Commons Collections to gain execution, we do not use that library at all in exploitation.

HP OO has a sizeable REST API. Part of that API is described in backwards-compatibility-servlet.xml. Here is an excerpt of the file:


<bean name="/wsExecutionBridgeService" class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter">
    <property name="service" ref="wsExecutionBridgeService"/>
    <property name="serviceInterface" value="com.hp.oo.flow.execution.services.WSExecutionBridgeService"/>
</bean>

The interesting part of this snippet is that HttpInvokerServiceExport expects the payload of an HTTP POST request to be usable by an ObjectInputStream. More importantly, HttpInvokerServiceExport indirectly calls readObject() on the payload which opens up the endpoint to deserialization vulnerabilities. For example, we can put a DiskFileItem object in the HTTP payload and generate a stack trace. When authentication is disabled, anyone can reach wsExecutionBridgeServer and trigger the above stack trace by POSTing objects to: http://[target]:8080/oo/backwards-compatibility/wsExecutionBridgeService. However, it does require authentication if the administrator has enabled that feature as previously noted.

Tenable created a simple proof of concept called hp-oo-exploits.html

consisting of a web page containing four buttons that, when pressed, exploit HP OO using four different ysoserial gadgets:

  1. FileUpload1: Creates a pseudo random named file in C:\Users\Public. Note that this file only lasts ~30 seconds before it gets deleted.
  2. BeanUtils1: Executes the command “cmd /c mkdir C:\Users\Public\beanutils_exploit”
  3. Spring1: Executes the command “cmd /c mkdir C:\Users\Public\spring1_exploit”
  4. Spring2: Executes the command “cmd /c mkdir C:\Users\Public\spring2_exploit”

Sorry, we just shared it with ZDI and not you.

Solution

HPE has released Operations Orchestration (HP OO) 10.70 to address this issue.

Disclosure Timeline

2016-04-06 - Issue discovered
2016-04-12 - Submitted to ZDI for consideration, case bainesjr0007 opened
2016-04-27 - ZDI having trouble making PoC work. Asks for tech support.
2016-04-27 - Tenable provides step-by-step guide including screenshots and log file info.
2016-06-14 - ZDI makes $1k offer. We accept.
2016-06-30 - ZDI reports issue to HP
2017-01-03 - HP releases advisory HPSBGN03688
2017-01-10 - ZDI releases ZDI-17-001

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2016-8519
Tenable Advisory ID
TRA-2017-05
Credit

Jacob Baines, Tenable Network Security

CVSSv2 Base / Temporal Score
10.0 / 8.3
CVSSv2 Vector
(AV:N/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C)
Additional Keywords
HPSBGN03688
c05361944
ZDI-CAN-3836
Affected Products
HP Operations Orchestration (HP OO) 10.50 Community Edition
Risk Factor
Critical

Advisory Timeline

2017-01-20 - [R1] Initial Release
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