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Remediating Insecure Deserialization (CWE-502) in Pivotal 6.6.04.08 (Smart Client / PBS)

Contents

Overview

This article addresses a security finding in Pivotal (reported on version 6.6.04.08) involving insecure (de)serialization (CWE-502) due to use of .NET BinaryFormatter.Deserialize for request/response payloads and/or persisted state handling between the Pivotal Package Client (Smart Client) and the Pivotal Business Server (PBS).

Because some identified code paths did not enforce sufficiently restrictive type controls (for example, missing or insufficient SerializationBinder restrictions), an attacker who can influence serialized input could potentially trigger gadget-chain deserialization leading to remote code execution (RCE). The remediation is an engineering-provided patch that updates both client and server components.

<supportagent>

Agent Notes

Investigation Summary:

Reviewed the reported CWE-502 finding and validated that multiple instances of .NET BinaryFormatter deserialization were present and represented a High/Critical risk depending on whether attacker-influenced data could reach the deserializer (including network inputs and/or tampered persisted state). Escalated for engineering remediation and tracked through completion.

Findings:

  • Finding confirmed: The reported insecure deserialization usage was valid and assessed as High/Critical due to potential gadget-chain deserialization and high-impact outcomes (including client-side RCE) if attacker-controlled serialized payloads or persisted state content are processed.
  • Exploitability rationale: Risk increases when external/network input can reach deserialization; known gadget chains can apply; impact is severe if payload execution is achieved.
  • Reported vulnerable code locations:
    • ConversionService.cs (Critical): BinaryStringRepToObject(string value) performs Base64 decode → MemoryStream → BinaryFormatter.Deserialize(stream) with no restrictive SerializationBinder.
    • StreamStatePersistenceService.cs (High): decrypt persisted bytes → BinaryFormatter.Deserialize(...) with no restrictive binder; risk depends on ability to write/replace persisted state content.
    • AuthenticationHelper.cs (Medium): file-based deserialize using UserInfoSerializationBinder; risk reduced by binder restrictions but still dependent on filesystem access controls.
  • Engineering remediation delivered:
    • Smart Client: replaced BinaryFormatter usage with secure JSON serialization.
    • PBS Server: implemented a SafeSerializationBinder to block dangerous types while preserving compatibility.
    • Verification: engineering testing confirmed RCE payloads are blocked after the fix.
  • Patch components: Patch artifact (example naming) patch-ghi-<issue_id>-cwe-502-<date>.zip, containing updated DLLs:
    • Smart Client: Pivotal.Engine.Client.Services.Conversion.dll
    • PBS Server: Pivotal.Core.Common.dll

Escalation: Engineering tracked via internal issue tracker GHI #15381

Non-technical automated acknowledgements were present but did not contain the technical resolution; remediation details came from engineering analysis and the delivered patch.

</supportagent>

Solution

Resolution summary

Apply the engineering-provided patch that remediates CWE-502 insecure deserialization:

  • Smart Client: replaces BinaryFormatter-based serialization with secure JSON serialization.
  • PBS Server: adds a SafeSerializationBinder to block dangerous types while maintaining compatibility.

What you need to do

1) Obtain the patch package

Use the patch package provided for this CWE-502 fix attached.

2) Patch the Pivotal Smart Client

  1. Stop/exit the Pivotal Smart Client on the target machine(s).
  2. Back up the existing DLL in the Smart Client install path (example):
    • C:\Program Files (x86)\<vendor>\PivotalClient\...\bin\Standard\
  3. Replace the DLL with the patched version from the patch package:
    • Pivotal.Engine.Client.Services.Conversion.dll
  4. Restart the Smart Client.

3) Patch the Pivotal Business Server (PBS)

  1. Stop the Pivotal Business Server service.
  2. Back up the existing DLL in the PBS install path (example):
    • C:\Program Files (x86)\<vendor>\Pivotal CRM\Business Server\
  3. Replace the DLL with the patched version from the patch package:
    • Pivotal.Core.Common.dll
  4. Start the Pivotal Business Server service.

Deployment order (important)

If your environment uses both the Smart Client and PBS, deploy the PBS Server patch first, or deploy both patches together, to avoid compatibility issues.

Validation

After deploying the patch:

  • Confirm Smart Client functionality (login and normal read/write operations).
  • Confirm the PBS service is running normally and Smart Clients can connect.
  • Re-run the same security test(s) that originally flagged the issue (for example, the penetration test checks/payloads) to confirm the previously flagged deserialization/RCE payloads are blocked.

Notes

  • After updating the Smart Client DLL, users may be prompted to re-authenticate (log in again).
  • If your security report includes additional concerns (for example, unencrypted HTTP transport), address those separately via configuration/security hardening. This patch specifically targets insecure deserialization (CWE-502) and related RCE risk.

Frequently Asked Questions

1. How do I know if I’m affected by this specific issue?

You are likely affected if your security scan/report flags CWE-502 (insecure deserialization) and identifies .NET BinaryFormatter usage in Smart Client/PBS components (commonly referencing Pivotal.Engine.Client.Services.Conversion.dll and/or Pivotal.Core.Common.dll), especially on Pivotal version 6.6.04.08.

2. Do I need to patch both Smart Client and PBS Server?

If you run both components, apply both patches. If only one component is in scope, apply the patch for that component; however, when both are present, patch PBS first (or patch both together) to maintain compatibility.

3. What changes after the patch is applied?

The Smart Client no longer uses BinaryFormatter for the vulnerable serialization path (moved to secure JSON). PBS blocks dangerous deserialization types via a SafeSerializationBinder. Users may need to sign in again after the Smart Client update.

4. What should I provide if I need help applying or validating the fix?

Provide (1) your Pivotal version, (2) whether you use Smart Client, PBS, or both, (3) affected DLL versions/file details before and after patching, and (4) validation results (for example, scan finding IDs or the exact test that previously reproduced the issue).



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  1. Priyanka Bhotika

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