GHSA-wrw9-m778-g6mc: Bl Memory Exposure Vulnerability

MODERATE
Share
CWE-200
Published
Advisory Summary

GHSA-wrw9-m778-g6mc is a MODERATE memory exposure vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Bl libraries in the npm ecosystem. The issue involves memory exposure in bl. Remediation is available by upgrading affected packages to version 0.9.5, 1.0.1.

GHSA-wrw9-m778-g6mc at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-wrw9-m778-g6mc
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Bl
Package Ecosystem npm
Published Date
Last Updated

How to Fix GHSA-wrw9-m778-g6mc

To remediate this vulnerability, upgrade all affected Bl dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

bl fixed: 0.9.5 
npm install bl@0.9.5
bl fixed: 1.0.1 
npm install bl@1.0.1
Verify Direct and Transitive Dependencies

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

npm ls bl

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-wrw9-m778-g6mc, inspect your project dependencies using npm:

npm ls bl

Analyze the terminal output to locate any version of Bl in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.5), your application is affected.

Note: The npm ls bl command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Bl, 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

Versions of `bl` before 0.9.5 and 1.0.1 are vulnerable to memory exposure. `bl.append(number)` in the affected `bl` versions passes a number to Buffer constructor, appending a chunk of uninitialized memory ## Recommendation Update to version 0.9.5, 1.0.1 or later.

GHSA-wrw9-m778-g6mc Affected Bl Versions

2 component(s)
Fixed Versions:
0.9.51.0.1
Product / Package Ecosystem Affected Versions Fixed Version
bl
npm/bl
npm
< 0.9.5
0.9.5
bl
npm/bl
npm
≥ 1.0.0
< 1.0.1
All 1 versions
1.0.0
1.0.1

References

Bl Source Repository REPOSITORY
https://github.com/rvagg/bl/pull/22
www.npmjs.com/advisories/596 WEB
https://www.npmjs.com/advisories/596

Frequently Asked Questions

What is GHSA-wrw9-m778-g6mc?
GHSA-wrw9-m778-g6mc is a security vulnerability in Bl involving Memory Exposure in bl under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Bl versions are affected?
Affected versions include releases prior to 0.9.5, 1.0.1 across affected packages: bl.
What version fixes GHSA-wrw9-m778-g6mc?
Upgrading to 0.9.5, 1.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is bl affected?
Yes, bl is affected in releases prior to 0.9.5, 1.0.1. Upgrade your dependency to 0.9.5, 1.0.1 or later.
What CWE is associated with GHSA-wrw9-m778-g6mc?
GHSA-wrw9-m778-g6mc is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check npm dependencies for GHSA-wrw9-m778-g6mc?
Run the dependency tree command: 'npm ls bl'. 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-wrw9-m778-g6mc",
  "modified" : "2020-08-31T18:29:15Z",
  "published" : "2019-06-03T17:27:57Z",
  "aliases" : [ ],
  "summary" : "Memory Exposure in bl",
  "details" : "Versions of `bl` before 0.9.5 and 1.0.1 are vulnerable to memory exposure.\n\n`bl.append(number)` in the affected `bl` versions passes a number to Buffer constructor, appending a chunk of uninitialized memory\n\n\n## Recommendation\n\nUpdate to version 0.9.5, 1.0.1 or later.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "bl"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.9.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "bl"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.0.1"
      } ]
    } ],
    "versions" : [ "1.0.0" ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/rvagg/bl/pull/22"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/596"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-06-03T17:23:00Z",
    "nvd_published_at" : null
  }
}