CVE-2020-35896: Ws Insufficient Size Checks Vulnerability

HIGH
Advisory Identifier: GHSA-rh7x-ppxx-p34c
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CVSS 7.5
CWE-400 CWE-770
Published
Advisory Summary

CVE-2020-35896 is a HIGH (CVSS 7.5) insufficient size checks vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Ws libraries in the crates.io ecosystem. The issue involves insufficient size checks in ws. Remediation is available in the latest vendor maintenance releases.

CVE-2020-35896 at a Glance

CVE Identifier CVE-2020-35896
GHSA Identifier GHSA-rh7x-ppxx-p34c
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Ws
Package Ecosystem crates.io
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-2020-35896

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

ws fixed: Latest secure release 
Upgrade ws to Latest secure release
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 ws

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35896, inspect your project dependencies for Ws:

inspect dependencies for ws

Analyze the terminal output to locate any version of Ws 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: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Ws, 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 the ws crate through 2020-09-25 for Rust. The outgoing buffer is not properly limited, leading to a remote memory-consumption attack.

CVE-2020-35896 Affected Ws Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
ws
 crates.io
≤ 0.9.1

References

NVD — CVE-2020-35896 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35896
Ws Source Repository REPOSITORY
https://github.com/housleyjk/ws-rs/issues/291
Ws Source Repository REPOSITORY
https://github.com/housleyjk/ws-rs
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0043.html

Frequently Asked Questions

What is CVE-2020-35896?
CVE-2020-35896 is a security vulnerability in Ws involving Insufficient size checks in ws under CWE-400: Uncontrolled Resource Consumption.
Which Ws versions are affected?
Affected versions include releases prior to current release patches across affected packages: ws.
What version fixes CVE-2020-35896?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is ws affected?
Yes, ws is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2020-35896?
CVE-2020-35896 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-2020-35896?
CVE-2020-35896 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check crates.io dependencies for CVE-2020-35896?
Run the dependency tree command: 'inspect dependencies for ws'. 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-rh7x-ppxx-p34c",
  "modified" : "2021-08-19T20:53:37Z",
  "published" : "2021-08-25T20:49:32Z",
  "aliases" : [ "CVE-2020-35896" ],
  "summary" : "Insufficient size checks in ws",
  "details" : "An issue was discovered in the ws crate through 2020-09-25 for Rust. The outgoing buffer is not properly limited, leading to a remote memory-consumption attack.",
  "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" : "crates.io",
      "name" : "ws"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.9.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35896"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/housleyjk/ws-rs/issues/291"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/housleyjk/ws-rs"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0043.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T20:53:37Z",
    "nvd_published_at" : "2020-12-31T10:15:00Z"
  }
}