[GHSA-prf8-cf2x-rhx7] fabric-sdk-java has ObjectInputStream.readObject() without ObjectInputFilter, which allows Java deserialization RCE#7570
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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 |
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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).
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| }, | ||
| { | ||
| "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.", |
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slight improvement of credits pls thanks : )