CVE-2020-35892: Simple slab Out Of Bounds Read Vulnerability

CRITICAL
Advisory Identifier: GHSA-438g-fx34-4h9m
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CVSS 9.1
CWE-125
Published
Advisory Summary

CVE-2020-35892 is a CRITICAL (CVSS 9.1) out of bounds read vulnerability (CWE-125: Out-of-bounds Read) affecting Simple slab libraries in the crates.io ecosystem. The issue involves out of bounds read in simple-slab. Remediation is available by upgrading affected packages to version 0.3.3.

CVE-2020-35892 at a Glance

CVE Identifier CVE-2020-35892
GHSA Identifier GHSA-438g-fx34-4h9m
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-125: Out-of-bounds Read
Affected Product Simple slab
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 9.1

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:H/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 High (C:H)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2020-35892

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

simple-slab fixed: 0.3.3 
Upgrade simple-slab to 0.3.3
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 simple-slab

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35892, inspect your project dependencies for Simple slab:

inspect dependencies for simple-slab

Analyze the terminal output to locate any version of Simple slab in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.3.3), 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-125: Out-of-bounds Read, where the product reads data past the end, or before the beginning, of the intended buffer. In Simple slab, 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 simple-slab crate before 0.3.3 for Rust. index() allows an out-of-bounds read.

CVE-2020-35892 Affected Simple slab Versions

1 component(s)
Fixed Versions:
0.3.3
Product / Package Ecosystem Affected Versions Fixed Version
simple-slab
 crates.io
< 0.3.3
0.3.3

References

NVD — CVE-2020-35892 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35892
Simple slab Source Repository REPOSITORY
https://github.com/nathansizemore/simple-slab/issues/2
Simple slab Source Repository REPOSITORY
https://github.com/nathansizemore/simple-slab
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0039.html

Frequently Asked Questions

What is CVE-2020-35892?
CVE-2020-35892 is a security vulnerability in Simple slab involving Out of bounds read in simple-slab under CWE-125: Out-of-bounds Read.
Which Simple slab versions are affected?
Affected versions include releases prior to 0.3.3 across affected packages: simple-slab.
What version fixes CVE-2020-35892?
Upgrading to 0.3.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is simple-slab affected?
Yes, simple-slab is affected in releases prior to 0.3.3. Upgrade your dependency to 0.3.3 or later.
What is the CVSS score of CVE-2020-35892?
CVE-2020-35892 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
What CWE is associated with CVE-2020-35892?
CVE-2020-35892 is classified under CWE-125: Out-of-bounds Read (The product reads data past the end, or before the beginning, of the intended buffer.).
How can I check crates.io dependencies for CVE-2020-35892?
Run the dependency tree command: 'inspect dependencies for simple-slab'. 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-438g-fx34-4h9m",
  "modified" : "2021-08-19T21:06:40Z",
  "published" : "2021-08-25T20:48:38Z",
  "aliases" : [ "CVE-2020-35892" ],
  "summary" : "Out of bounds read in simple-slab",
  "details" : "An issue was discovered in the simple-slab crate before 0.3.3 for Rust. index() allows an out-of-bounds read.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "simple-slab"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35892"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nathansizemore/simple-slab/issues/2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/nathansizemore/simple-slab"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0039.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-125" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T21:06:40Z",
    "nvd_published_at" : "2020-12-31T10:15:00Z"
  }
}