[GHSA-prf8-cf2x-rhx7] fabric-sdk-java has ObjectInputStream.readObject() without ObjectInputFilter, which allows Java deserialization RCE#7570
Conversation
|
Hi there @ryjones! A community member has suggested an improvement to your security advisory. If approved, this change will affect the global advisory listed at github.com/advisories. It will not affect the version listed in your project repository. This change will be reviewed by our Security Curation Team. If you have thoughts or feedback, please share them in a comment here! If this PR has already been closed, you can start a new community contribution for this advisory |
github-actions
Bot
changed the base branch from
main
to
brodmart/advisory-improvement-7570
There was a problem hiding this comment.
Pull request overview
Adds a new GitHub-reviewed security advisory record for GHSA-prf8-cf2x-rhx7 (CVE-2026-41586), documenting a Java deserialization RCE risk in the deprecated fabric-sdk-java client SDK.
Changes:
- Introduces a new advisory JSON entry with summary/details, CVSS v4 score, affected Maven coordinates and version range, and references.
- Documents affected code paths (
ObjectInputStream.readObject()withoutObjectInputFilter) and recommended remediation (filtering / migration).
💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.
| }, | ||
| { | ||
| "type": "PACKAGE", | ||
| "url": "https://github.com/hyperledger/fabric" |
| "CVE-2026-41586" | ||
| ], | ||
| "summary": "fabric-sdk-java has ObjectInputStream.readObject() without ObjectInputFilter, which allows Java deserialization RCE", | ||
| "details": "## Summary\n\nThis advisory covers the deprecated `fabric-sdk-java` client SDK. `Channel.java` implements `readObject()` and exposes `deSerializeChannel()` which call `ObjectInputStream.readObject()` on untrusted byte arrays without configuring an `ObjectInputFilter`. This is the classic Java deserialization RCE pattern.\n\n**Note:** `fabric-sdk-java` is deprecated and maintained in https://github.com/hyperledger/fabric-sdk-java. Filing here as that repo does not have private vulnerability reporting enabled.\n\n## Affected Code\n\n```java\n// src/main/java/org/hyperledger/fabric/sdk/Channel.java\nprivate void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {\n in.defaultReadObject(); // No ObjectInputFilter configured\n}\n\npublic Channel deSerializeChannel(byte[] channelBytes)\n throws IOException, ClassNotFoundException, InvalidArgumentException {\n ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(channelBytes));\n Channel channel = (Channel) ois.readObject(); // Untrusted bytes deserialized\n return channel;\n}\n```\n\n## Attack Vector\n\nAn attacker who can supply crafted serialized Channel bytes to the client application — for example, by compromising a local channel file, injecting data through an application that accepts Channel bytes from external sources, or exploiting a separate write primitive — can achieve RCE via gadget chain exploitation when deSerializeChannel() processes those bytes. The risk is highest in deployments that accept Channel data from sources outside the client's direct control. Note: channel data is not transmitted from Fabric peers; this is a client-side deserialization surface.\n\n## Proof of Concept\n\n```java\n// Generate malicious payload with ysoserial:\n// java -jar ysoserial.jar CommonsCollections6 \"touch /tmp/pwned\" > malicious_channel.ser\n\n// Victim code:\nbyte[] maliciousBytes = Files.readAllBytes(Paths.get(\"malicious_channel.ser\"));\nChannel channel = client.deSerializeChannel(maliciousBytes); // RCE fires here\n```\n\n## Notes on Deprecation\n\nfabric-sdk-java is deprecated as of Hyperledger Fabric v2.5 (replaced by `org.hyperledger.fabric:fabric-gateway`). However, organizations that have not yet migrated remain fully exposed. Automated dependency scanners (Snyk, Dependabot) cannot alert users without a published GHSA. This advisory is filed to ensure those users are notified and directed to migrate.\n\n## Fix\n\nFor the deprecated SDK: add `ObjectInputFilter` to whitelist only expected classes:\n\n```java\nObjectInputFilter filter = ObjectInputFilter.Config.createFilter(\n \"org.hyperledger.fabric.sdk.*;java.util.*;java.lang.*;!*\"\n);\nois.setObjectInputFilter(filter);\n```\n\n**The recommended remediation is migration to `org.hyperledger.fabric:fabric-gateway`**, which does not use Java serialization.\n\n## Resources\n\n- CWE-502: Deserialization of Untrusted Data\n- Migration guide: https://hyperledger.github.io/fabric-gateway/\n\n## Credits\n\nFound by Martin Brodeur (brodmart) via independent security research.", |
|
👋 This pull request has been marked as stale because it has been open with no activity. You can: comment on the issue or remove the stale label to hold stale off for a while, add the |
advisory-database
Bot
merged commit 10a6275
into
brodmart/advisory-improvement-7570
|
Hi @brodmart! Thank you so much for contributing to the GitHub Advisory Database. This database is free, open, and accessible to all, and it's people like you who make it great. Thanks for choosing to help others. We hope you send in more contributions in the future! |
Updates
Comments
slight improvement of credits pls thanks : )