CVE-2016-6298: Jwcrypto Jwcrypto Lacks The Random Filling Vulnerability

MODERATE
Advisory Identifier: GHSA-wg33-x934-3ghh
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CVSS 5.3
CWE-200
Published
Advisory Summary

CVE-2016-6298 is a MODERATE (CVSS 5.3) jwcrypto lacks the random filling vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Jwcrypto libraries in the PyPI ecosystem. The issue involves jwcrypto lacks the random filling protection mechanism. Remediation is available by upgrading affected packages to version 0.3.2.

CVE-2016-6298 at a Glance

CVE Identifier CVE-2016-6298
GHSA Identifier GHSA-wg33-x934-3ghh
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Jwcrypto
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N).

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

How to Fix CVE-2016-6298

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

jwcrypto fixed: 0.3.2 
pip install jwcrypto>=0.3.2
Verify Direct and Transitive Dependencies

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

pip show jwcrypto

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2016-6298, inspect your installed packages using pip:

pip show jwcrypto

Analyze the terminal output to locate any version of Jwcrypto in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.3.2), your application is affected.

Note: The pip show jwcrypto command checks currently installed packages in your active Python environment.

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 Jwcrypto, 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

The _Rsa15 class in the RSA 1.5 algorithm implementation in jwa.py in jwcrypto before 0.3.2 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartext data via a Million Message Attack (MMA).

CVE-2016-6298 Affected Jwcrypto Versions

1 component(s)
Fixed Versions:
0.3.2
Product / Package Ecosystem Affected Versions Fixed Version
jwcrypto
pypi/jwcrypto
PyPI
< 0.3.2
0.3.2

References

NVD — CVE-2016-6298 NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-6298
Jwcrypto Source Repository REPOSITORY
https://github.com/latchset/jwcrypto/issues/65
Jwcrypto Source Repository REPOSITORY
https://github.com/latchset/jwcrypto/pull/66
Security Fix Commit FIX COMMIT
https://github.com/latchset/jwcrypto/commit/eb5be5bd94c8cae1d7f3ba9801377084d8e5a7ba
Jwcrypto Source Repository REPOSITORY
https://github.com/latchset/jwcrypto
Jwcrypto Release RELEASE
https://github.com/latchset/jwcrypto/releases/tag/v0.3.2
Jwcrypto Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/jwcrypto/PYSEC-2016-4.yaml
Jwcrypto Security Information SECURITY
https://web.archive.org/web/20200227230613/http://www.securityfocus.com/bid/92729

Frequently Asked Questions

What is CVE-2016-6298?
CVE-2016-6298 is a security vulnerability in Jwcrypto involving jwcrypto lacks the Random Filling protection mechanism under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Jwcrypto versions are affected?
Affected versions include releases prior to 0.3.2 across affected packages: jwcrypto.
What version fixes CVE-2016-6298?
Upgrading to 0.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jwcrypto affected?
Yes, jwcrypto is affected in releases prior to 0.3.2. Upgrade your dependency to 0.3.2 or later.
What is the CVSS score of CVE-2016-6298?
CVE-2016-6298 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2016-6298?
CVE-2016-6298 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 PyPI dependencies for CVE-2016-6298?
Run the dependency tree command: 'pip show jwcrypto'. 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-wg33-x934-3ghh",
  "modified" : "2024-11-19T19:24:34Z",
  "published" : "2022-05-17T03:39:31Z",
  "aliases" : [ "CVE-2016-6298" ],
  "summary" : "jwcrypto lacks the Random Filling protection mechanism",
  "details" : "The _Rsa15 class in the RSA 1.5 algorithm implementation in jwa.py in jwcrypto before 0.3.2 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartext data via a Million Message Attack (MMA).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "jwcrypto"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2016-6298"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/latchset/jwcrypto/issues/65"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/latchset/jwcrypto/pull/66"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/latchset/jwcrypto/commit/eb5be5bd94c8cae1d7f3ba9801377084d8e5a7ba"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/latchset/jwcrypto"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/latchset/jwcrypto/releases/tag/v0.3.2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/jwcrypto/PYSEC-2016-4.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20200227230613/http://www.securityfocus.com/bid/92729"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-29T16:19:35Z",
    "nvd_published_at" : "2016-09-01T23:59:00Z"
  }
}