CVE-2020-35685: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-hf8h-gvq7-6gfr
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CWE-330
Published
Advisory Summary

CVE-2020-35685 is a CRITICAL security vulnerability vulnerability (CWE-330: Use of Insufficiently Random Values) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.. Remediation is available in the latest vendor maintenance releases.

CVE-2020-35685 at a Glance

CVE Identifier CVE-2020-35685
GHSA Identifier GHSA-hf8h-gvq7-6gfr
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-330: Use of Insufficiently Random Values
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2020-35685

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

Verify Direct and Transitive Dependencies

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

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-35685, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

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

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-330: Use of Insufficiently Random Values, where the product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers. In Software, 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

An issue was discovered in HCC Nichestack 3.0. The code that generates Initial Sequence Numbers (ISNs) for TCP connections derives the ISN from an insufficiently random source. As a result, an attacker may be able to determine the ISN of current and future TCP connections and either hijack existing ones or spoof future ones. (Proper ISN generation should aim to follow at least the specifications outlined in RFC 6528.)

References

NVD — CVE-2020-35685 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35685
cert-portal.siemens.com/productcert/pdf/ssa... WEB
https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf
www.forescout.com/blog/new-critical-o... WEB
https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack
www.hcc-embedded.com WEB
https://www.hcc-embedded.com
www.kb.cert.org/vuls/id/608209 WEB
https://www.kb.cert.org/vuls/id/608209

Frequently Asked Questions

What is CVE-2020-35685?
CVE-2020-35685 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-330: Use of Insufficiently Random Values.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2020-35685?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2020-35685?
CVE-2020-35685 is classified under CWE-330: Use of Insufficiently Random Values (The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.).
How can I check Maven dependencies for CVE-2020-35685?
Run the dependency tree command: 'mvn dependency:tree'. 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-hf8h-gvq7-6gfr",
  "modified" : "2022-05-24T19:11:41Z",
  "published" : "2022-05-24T19:11:41Z",
  "aliases" : [ "CVE-2020-35685" ],
  "details" : "An issue was discovered in HCC Nichestack 3.0. The code that generates Initial Sequence Numbers (ISNs) for TCP connections derives the ISN from an insufficiently random source. As a result, an attacker may be able to determine the ISN of current and future TCP connections and either hijack existing ones or spoof future ones. (Proper ISN generation should aim to follow at least the specifications outlined in RFC 6528.)",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35685"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf"
  }, {
    "type" : "WEB",
    "url" : "https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack"
  }, {
    "type" : "WEB",
    "url" : "https://www.hcc-embedded.com"
  }, {
    "type" : "WEB",
    "url" : "https://www.kb.cert.org/vuls/id/608209"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-330" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2021-08-19T12:15:00Z"
  }
}