CVE-2021-42248: Duplicate Advisory Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-c9gm-7rfj-8w5h
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CVSS 7.5
CWE-1333
Published
Advisory Summary

CVE-2021-42248 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting Duplicate Advisory libraries in the Go ecosystem. The issue involves redos via crafted json input in gjson. Remediation is available by upgrading affected packages to version 1.9.3.

CVE-2021-42248 at a Glance

CVE Identifier CVE-2021-42248
GHSA Identifier GHSA-c9gm-7rfj-8w5h
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product Duplicate Advisory
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-2021-42248

To remediate this vulnerability, upgrade all affected Duplicate Advisory 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/tidwall/gjson fixed: 1.9.3 
Upgrade github.com/tidwall/gjson to 1.9.3
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/tidwall/gjson

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-42248, inspect your project dependencies for Duplicate Advisory:

inspect dependencies for github.com/tidwall/gjson

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.9.3), 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-1333: Inefficient Regular Expression Complexity, where the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. In Duplicate Advisory, 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

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-ppj4-34rq-v8j9. This link is maintained to preserve external references. ## Original Description GJSON <= 1.9.2 allows attackers to cause a redos via crafted JSON input.

CVE-2021-42248 Affected Duplicate Advisory Versions

1 component(s)
Fixed Versions:
1.9.3
Product / Package Ecosystem Affected Versions Fixed Version
github.com/tidwall/gjson
golang/github.com/tidwall/gjson
Go
< 1.9.3
1.9.3

References

NVD — CVE-2021-42248 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-42248
Duplicate Advisory Source Repository REPOSITORY
https://github.com/tidwall/gjson/issues/236
Duplicate Advisory Source Repository REPOSITORY
https://github.com/tidwall/gjson/issues/237
Security Fix Commit FIX COMMIT
https://github.com/tidwall/gjson/commit/590010fdac311cc8990ef5c97448d4fec8f29944
Security Fix Commit FIX COMMIT
https://github.com/tidwall/gjson/commit/77a57fda87dca6d0d7d4627d512a630f89a91c96
Duplicate Advisory Source Repository REPOSITORY
https://github.com/tidwall/gjson
pkg.go.dev/vuln/go-2021-0265 WEB
https://pkg.go.dev/vuln/GO-2021-0265

Frequently Asked Questions

What is CVE-2021-42248?
CVE-2021-42248 is a security vulnerability in Duplicate Advisory involving ReDoS via crafted JSON input in GJSON under CWE-1333: Inefficient Regular Expression Complexity.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to 1.9.3 across affected packages: github.com/tidwall/gjson.
What version fixes CVE-2021-42248?
Upgrading to 1.9.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/tidwall/gjson affected?
Yes, github.com/tidwall/gjson is affected in releases prior to 1.9.3. Upgrade your dependency to 1.9.3 or later.
What is the CVSS score of CVE-2021-42248?
CVE-2021-42248 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-2021-42248?
CVE-2021-42248 is classified under CWE-1333: Inefficient Regular Expression Complexity (The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.).
How can I check Go dependencies for CVE-2021-42248?
Run the dependency tree command: 'inspect dependencies for github.com/tidwall/gjson'. 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-c9gm-7rfj-8w5h",
  "modified" : "2024-05-03T20:39:36Z",
  "published" : "2022-05-25T00:00:38Z",
  "withdrawn" : "2024-05-03T20:39:36Z",
  "aliases" : [ "CVE-2021-42248" ],
  "summary" : "Duplicate Advisory: ReDoS via crafted JSON input in GJSON",
  "details" : "## Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-ppj4-34rq-v8j9. This link is maintained to preserve external references.\n\n## Original Description\nGJSON <= 1.9.2 allows attackers to cause a redos via crafted JSON input.",
  "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/tidwall/gjson"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.9.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-42248"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tidwall/gjson/issues/236"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tidwall/gjson/issues/237"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tidwall/gjson/commit/590010fdac311cc8990ef5c97448d4fec8f29944"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tidwall/gjson/commit/77a57fda87dca6d0d7d4627d512a630f89a91c96"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/tidwall/gjson"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2021-0265"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-06T21:20:02Z",
    "nvd_published_at" : "2022-05-24T15:15:00Z"
  }
}