CVE-2020-36205: Xcb Memory Handling Issues Vulnerability

MODERATE
Advisory Identifier: GHSA-c8hq-x4mm-p6q6
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CVSS 5.5
CWE-415 CWE-416
Published
Advisory Summary

CVE-2020-36205 is a MODERATE (CVSS 5.5) memory handling issues vulnerability (CWE-415: Double Free) affecting Xcb libraries in the crates.io ecosystem. The issue involves memory handling issues in xcb. Remediation is available by upgrading affected packages to version 1.0.0.

CVE-2020-36205 at a Glance

CVE Identifier CVE-2020-36205
GHSA Identifier GHSA-c8hq-x4mm-p6q6
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-415: Double Free
Affected Product Xcb
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2020-36205

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

xcb fixed: 1.0.0 
Upgrade xcb to 1.0.0
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 xcb

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36205, inspect your project dependencies for Xcb:

inspect dependencies for xcb

Analyze the terminal output to locate any version of Xcb in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.0), 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-415: Double Free, where the product calls free() twice on the same memory address. In Xcb, 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 xcb crate through 2020-12-10 for Rust. base::Error does not have soundness. Because of the public ptr field, a use-after-free or double-free can occur.

CVE-2020-36205 Affected Xcb Versions

1 component(s)
Fixed Versions:
1.0.0
Product / Package Ecosystem Affected Versions Fixed Version
xcb
 crates.io
< 1.0.0
1.0.0

References

NVD — CVE-2020-36205 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36205
Xcb Source Repository REPOSITORY
https://github.com/rtbo/rust-xcb/issues/93
Xcb Source Repository REPOSITORY
https://github.com/rust-x-bindings/rust-xcb/issues/93
Xcb Source Repository REPOSITORY
https://github.com/rtbo/rust-xcb
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0097.html

Frequently Asked Questions

What is CVE-2020-36205?
CVE-2020-36205 is a security vulnerability in Xcb involving Memory handling issues in xcb under CWE-415: Double Free.
Which Xcb versions are affected?
Affected versions include releases prior to 1.0.0 across affected packages: xcb.
What version fixes CVE-2020-36205?
Upgrading to 1.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is xcb affected?
Yes, xcb is affected in releases prior to 1.0.0. Upgrade your dependency to 1.0.0 or later.
What is the CVSS score of CVE-2020-36205?
CVE-2020-36205 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2020-36205?
CVE-2020-36205 is classified under CWE-415: Double Free (The product calls free() twice on the same memory address.).
How can I check crates.io dependencies for CVE-2020-36205?
Run the dependency tree command: 'inspect dependencies for xcb'. 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-c8hq-x4mm-p6q6",
  "modified" : "2023-02-13T16:58:12Z",
  "published" : "2021-08-25T20:50:54Z",
  "aliases" : [ "CVE-2020-36205" ],
  "summary" : "Memory handling issues in xcb",
  "details" : "An issue was discovered in the xcb crate through 2020-12-10 for Rust. base::Error does not have soundness. Because of the public ptr field, a use-after-free or double-free can occur.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "xcb"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36205"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rtbo/rust-xcb/issues/93"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rust-x-bindings/rust-xcb/issues/93"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rtbo/rust-xcb"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0097.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-415", "CWE-416" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T18:50:43Z",
    "nvd_published_at" : "2021-01-26T18:15:00Z"
  }
}