CVE-2021-43667: Github.com/hyperledger/fabric NULL Pointer Dereference Vulnerability
HIGHCVE-2021-43667 is a HIGH (CVSS 7.5) null pointer dereference vulnerability (CWE-476: NULL Pointer Dereference) affecting Github.com/hyperledger/fabric libraries in the Go ecosystem. The issue involves null pointer dereference in hyperledger fabric. Remediation is available by upgrading affected packages to version 2.3.3, 2.2.4.
CVE-2021-43667 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
How to Fix CVE-2021-43667
To remediate this vulnerability, upgrade all affected Github.com/hyperledger/fabric dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/hyperledger/fabric to 2.3.3Upgrade github.com/hyperledger/fabric to 2.2.4Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/hyperledger/fabricHow to Check if You Are Affected
To determine whether your application is affected by CVE-2021-43667, inspect your project dependencies for Github.com/hyperledger/fabric:
inspect dependencies for github.com/hyperledger/fabricAnalyze the terminal output to locate any version of Github.com/hyperledger/fabric in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.3.3), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-476: NULL Pointer Dereference, where the product dereferences a pointer that it expects to be valid but is null. In Github.com/hyperledger/fabric, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2021-43667 Affected Github.com/hyperledger/fabric Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/hyperledger/fabric
|
Go |
≥ 2.3.0
< 2.3.3
|
2.3.3
|
|
github.com/hyperledger/fabric
|
Go |
< 2.2.4
|
2.2.4
|
References
Frequently Asked Questions
What is CVE-2021-43667?
Which Github.com/hyperledger/fabric versions are affected?
What version fixes CVE-2021-43667?
Is github.com/hyperledger/fabric affected?
What is the CVSS score of CVE-2021-43667?
What CWE is associated with CVE-2021-43667?
How can I check Go dependencies for CVE-2021-43667?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-vjj6-5m9f-wqjw",
"modified" : "2022-05-25T19:23:25Z",
"published" : "2022-05-25T19:23:25Z",
"aliases" : [ "CVE-2021-43667" ],
"summary" : "NULL Pointer Dereference in HyperLedger Fabric",
"details" : "A vulnerability has been detected in HyperLedger Fabric v1.4.0, v2.0.0, v2.1.0. This bug can be leveraged by constructing a message whose payload is nil and sending this message with the method 'forwardToLeader'. This bug has been admitted and fixed by the developers of Fabric. If leveraged, any leader node will crash.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/hyperledger/fabric"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.3.0"
}, {
"fixed" : "2.3.3"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/hyperledger/fabric"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.2.4"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-43667"
}, {
"type" : "WEB",
"url" : "https://github.com/hyperledger/fabric/pull/2838/commits/ebf94b10ecc86d3a91619b98befc52277b1e3474"
}, {
"type" : "WEB",
"url" : "https://github.com/hyperledger/fabric/pull/2844"
}, {
"type" : "WEB",
"url" : "https://jira.hyperledger.org/browse/FAB-18529"
}, {
"type" : "PACKAGE",
"url" : "github.com/hyperledger/fabric"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-476" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2022-05-25T19:23:25Z",
"nvd_published_at" : "2021-11-18T16:15:00Z"
}
}