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[R1] Hewlett Packard Network Automation RPCServlet Arbitrary Code Execution

High

Synopsis

HP Network Automation (HP NA) software, available for Windows or Linux, "automates the complete operational lifecycle of network devices from provisioning to policy-based change management, compliance, and security administration." Within HP NA, the RPCServlet or com.rendition.web.servlets.RpcServlet.class is an HTTP endpoint that can be invoked via GET or POST requests to the NA admin server at https://[target]/call. The sole purpose of the RPCServlet appears to be the invocation of arbitrary static functions by the client. This can be quite dangerous, but the servlet restricts access to specific IP addresses:

  1. Two addresses are hardcoded into the servlet to always have access: 127.0.0.1 and 0:0:0:0:0:0:0:1 (aka localhost).
  2. The “gateway/mesh/host” address in the configuration file is allowed access. By default, this value is not set.
  3. All addresses in the “rpc/allowed_ips” configuration option. As far as we can tell this doesn’t even exist in the configuration by default.

So by default, the RPCServlet will only process requests from localhost. That prevents full-on remote code execution, but opens the door for phishing goodness. Similar to recent vulnerabilities found by Tavis Ormandy, if an attacker can get a user with HP NA installed on their machine to open a crafted webpage then the attacker can access RPCServlet and execute arbitrary commands. This vector is also exploitable via deserialization attacks. Two specific libraries are useful here: Commons-Collections and Commons-BeanUtils. We can leverage these libraries to create serialized objects to eventually execute Runtime.getRuntime().exec().

Solution

HPE has released Hewlett Packard Network Automation versions 10.00.021, 10.11.011, and 10.20.001 to address this issue.

Disclosure Timeline

2016-03-31 - Issue discovered
2016-04-05 - Submitted to ZDI for consideration, case bainesjr0005
2016-04-25 - ZDI offers $1000, we proudly accept
2016-07-18 - Vulnerability reported to vendor by ZDI
2016-11-28 - HP publishes c05344849 / HPSBGN03677 advisory

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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-2016-8511
Tenable Advisory ID
TRA-2016-39
Credit

Jacob Baines, Tenable Network Security

CVSSv2 Base / Temporal Score
9.3 / 7.7
CVSSv2 Vector
AV:N/AC:M/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C)
Additional Keywords
ZDI-CAN-3729, HPSBGN03677, c05344849
Affected Products
Hewlett Packard Network Automation 10.00, 10.00.02, 10.10, 10.11, 10.20
Risk Factor
High

Advisory Timeline

2016-12-11 - [R1] Initial Release
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