CVE-2021-38188: Iced x86 Incorrect Buffer Size Calculation Vulnerability

CRITICAL
Advisory Identifier: GHSA-jjx5-3f36-6927
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CVSS 9.8
CWE-131
Published
Advisory Summary

CVE-2021-38188 is a CRITICAL (CVSS 9.8) incorrect buffer size calculation vulnerability (CWE-131: Incorrect Calculation of Buffer Size) affecting Iced x86 libraries in the crates.io ecosystem. The issue involves incorrect buffer size calculation in iced-x86. Remediation is available by upgrading affected packages to version 1.11.0.

CVE-2021-38188 at a Glance

CVE Identifier CVE-2021-38188
GHSA Identifier GHSA-jjx5-3f36-6927
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-131: Incorrect Calculation of Buffer Size
Affected Product Iced x86
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/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 High (I:H)
Availability High (A:H)

How to Fix CVE-2021-38188

To remediate this vulnerability, upgrade all affected Iced x86 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

iced-x86 fixed: 1.11.0 
Upgrade iced-x86 to 1.11.0
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 iced-x86

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-38188, inspect your project dependencies for Iced x86:

inspect dependencies for iced-x86

Analyze the terminal output to locate any version of Iced x86 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.11.0), 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-131: Incorrect Calculation of Buffer Size, where the product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow. In Iced x86, 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 iced-x86 crate through 1.10.3 for Rust. In Decoder::new(), slice.get_unchecked(slice.length()) is used unsafely.

CVE-2021-38188 Affected Iced x86 Versions

1 component(s)
Fixed Versions:
1.11.0
Product / Package Ecosystem Affected Versions Fixed Version
iced-x86
 crates.io
< 1.11.0
1.11.0

References

NVD — CVE-2021-38188 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-38188
Iced x86 Source Repository REPOSITORY
https://github.com/icedland/iced/issues/168
Security Fix Commit FIX COMMIT
https://github.com/icedland/iced/commit/3c607a003e03b773108401d109167d1840487dce
Iced x86 Source Repository REPOSITORY
https://github.com/icedland/iced
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0068.html

Frequently Asked Questions

What is CVE-2021-38188?
CVE-2021-38188 is a security vulnerability in Iced x86 involving Incorrect buffer size calculation in iced-x86 under CWE-131: Incorrect Calculation of Buffer Size.
Which Iced x86 versions are affected?
Affected versions include releases prior to 1.11.0 across affected packages: iced-x86.
What version fixes CVE-2021-38188?
Upgrading to 1.11.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is iced-x86 affected?
Yes, iced-x86 is affected in releases prior to 1.11.0. Upgrade your dependency to 1.11.0 or later.
What is the CVSS score of CVE-2021-38188?
CVE-2021-38188 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-38188?
CVE-2021-38188 is classified under CWE-131: Incorrect Calculation of Buffer Size (The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.).
How can I check crates.io dependencies for CVE-2021-38188?
Run the dependency tree command: 'inspect dependencies for iced-x86'. 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-jjx5-3f36-6927",
  "modified" : "2021-08-18T21:31:51Z",
  "published" : "2021-08-25T20:55:47Z",
  "aliases" : [ "CVE-2021-38188" ],
  "summary" : "Incorrect buffer size calculation in iced-x86",
  "details" : "An issue was discovered in the iced-x86 crate through 1.10.3 for Rust. In Decoder::new(), slice.get_unchecked(slice.length()) is used unsafely.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "iced-x86"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.11.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-38188"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/icedland/iced/issues/168"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/icedland/iced/commit/3c607a003e03b773108401d109167d1840487dce"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/icedland/iced"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0068.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-131" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-18T21:31:51Z",
    "nvd_published_at" : "2021-08-08T06:15:00Z"
  }
}