CVE-2021-43669: Github.com/hyperledger/fabric HTTP Request Smuggling Vulnerability

HIGH
Advisory Identifier: GHSA-j96p-r523-8r3w
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CVSS 7.5
CWE-444
Published
Advisory Summary

CVE-2021-43669 is a HIGH (CVSS 7.5) http request smuggling vulnerability (CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')) affecting Github.com/hyperledger/fabric libraries in the Go ecosystem. The issue involves http request smuggling in github.com/hyperledger/fabric. Remediation is available by upgrading affected packages to version 2.4.0.

CVE-2021-43669 at a Glance

CVE Identifier CVE-2021-43669
GHSA Identifier GHSA-j96p-r523-8r3w
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Product Github.com/hyperledger/fabric
Package Ecosystem Go
Published Date
Last Updated

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).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2021-43669

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.

github.com/hyperledger/fabric fixed: 2.4.0 
Upgrade github.com/hyperledger/fabric to 2.4.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/hyperledger/fabric

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-43669, inspect your project dependencies for Github.com/hyperledger/fabric:

inspect dependencies for github.com/hyperledger/fabric

Analyze 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 2.4.0), 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-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'), where the product acts as an intermediary http agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed http requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. 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

A vulnerability has been detected in HyperLedger Fabric v1.4.0, v2.0.0, v2.0.1, v2.3.0. It can easily break down as many orderers as the attacker wants. This bug can be leveraged by constructing a message whose header is invalid to the interface Order. This bug has been admitted and fixed by the developers of Fabric.

CVE-2021-43669 Affected Github.com/hyperledger/fabric Versions

1 component(s)
Fixed Versions:
2.4.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/hyperledger/fabric
golang/github.com/hyperledger/fabric
Go
< 2.4.0
2.4.0

References

NVD — CVE-2021-43669 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-43669
Github.com/hyperledger/fabric Source Repository REPOSITORY
https://github.com/hyperledger/fabric/pull/2828
Github.com/hyperledger/fabric Source Repository REPOSITORY
https://github.com/hyperledger/fabric
Github.com/hyperledger/fabric Release RELEASE
https://github.com/hyperledger/fabric/releases/tag/v2.4.0-beta
jira.hyperledger.org/browse/fab-18528 WEB
https://jira.hyperledger.org/browse/FAB-18528

Frequently Asked Questions

What is CVE-2021-43669?
CVE-2021-43669 is a security vulnerability in Github.com/hyperledger/fabric involving HTTP Request Smuggling in github.com/hyperledger/fabric under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling').
Which Github.com/hyperledger/fabric versions are affected?
Affected versions include releases prior to 2.4.0 across affected packages: github.com/hyperledger/fabric.
What version fixes CVE-2021-43669?
Upgrading to 2.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/hyperledger/fabric affected?
Yes, github.com/hyperledger/fabric is affected in releases prior to 2.4.0. Upgrade your dependency to 2.4.0 or later.
What is the CVSS score of CVE-2021-43669?
CVE-2021-43669 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-43669?
CVE-2021-43669 is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') (The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.).
How can I check Go dependencies for CVE-2021-43669?
Run the dependency tree command: 'inspect dependencies for github.com/hyperledger/fabric'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j96p-r523-8r3w",
  "modified" : "2021-11-24T19:42:20Z",
  "published" : "2021-12-03T20:52:02Z",
  "aliases" : [ "CVE-2021-43669" ],
  "summary" : "HTTP Request Smuggling in github.com/hyperledger/fabric",
  "details" : "A vulnerability has been detected in HyperLedger Fabric v1.4.0, v2.0.0, v2.0.1, v2.3.0. It can easily break down as many orderers as the attacker wants. This bug can be leveraged by constructing a message whose header is invalid to the interface Order. This bug has been admitted and fixed by the developers of Fabric.",
  "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" : "0"
      }, {
        "fixed" : "2.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-43669"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hyperledger/fabric/pull/2828"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hyperledger/fabric"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hyperledger/fabric/releases/tag/v2.4.0-beta"
  }, {
    "type" : "WEB",
    "url" : "https://jira.hyperledger.org/browse/FAB-18528"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-444" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-11-24T19:42:20Z",
    "nvd_published_at" : "2021-11-18T16:15:00Z"
  }
}