CVE-2018-20992: Claxon Uninitialized Memory Exposure Vulnerability

MODERATE
Advisory Identifier: GHSA-8c6g-4xc5-w96c
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CVSS 6.5
CWE-908
Published
Advisory Summary

CVE-2018-20992 is a MODERATE (CVSS 6.5) uninitialized memory exposure vulnerability (CWE-908: Use of Uninitialized Resource) affecting Claxon libraries in the crates.io ecosystem. The issue involves uninitialized memory exposure in claxon. Remediation is available by upgrading affected packages to version 0.4.1, 0.3.2.

CVE-2018-20992 at a Glance

CVE Identifier CVE-2018-20992
GHSA Identifier GHSA-8c6g-4xc5-w96c
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-908: Use of Uninitialized Resource
Affected Product Claxon
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2018-20992

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

claxon fixed: 0.4.1 
Upgrade claxon to 0.4.1
claxon fixed: 0.3.2 
Upgrade claxon to 0.3.2
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 claxon

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-20992, inspect your project dependencies for Claxon:

inspect dependencies for claxon

Analyze the terminal output to locate any version of Claxon in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.1), 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-908: Use of Uninitialized Resource, where the product uses or accesses a resource that has not been initialized. In Claxon, 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

Affected versions of Claxon made an invalid assumption about the decode buffer size being a multiple of a value read from the bitstream. This could cause parts of the decode buffer to not be overwritten. If the decode buffer was newly allocated and uninitialized, this uninitialized memory could be exposed. This allows an attacker to observe parts of the uninitialized memory in the decoded audio stream. The flaw was corrected by checking that the value read from the bitstream divides the decode buffer size, and returning a format error if it does not. If an error is returned, the decode buffer is not exposed. Regression tests and an additional fuzzer have been added to prevent similar flaws in the future.

CVE-2018-20992 Affected Claxon Versions

2 component(s)
Fixed Versions:
0.4.10.3.2
Product / Package Ecosystem Affected Versions Fixed Version
claxon
 crates.io
≥ 0.4.0
< 0.4.1
0.4.1
claxon
 crates.io
< 0.3.2
0.3.2

References

NVD — CVE-2018-20992 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-20992
Security Fix Commit FIX COMMIT
https://github.com/ruuda/claxon/commit/8f28ec275e412dd3af4f3cda460605512faf332c
Claxon Source Repository REPOSITORY
https://github.com/ruuda/claxon
Claxon Release RELEASE
https://github.com/ruuda/claxon/releases/tag/v0.3.2
Claxon Release RELEASE
https://github.com/ruuda/claxon/releases/tag/v0.4.1
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2018-0004.html

Frequently Asked Questions

What is CVE-2018-20992?
CVE-2018-20992 is a security vulnerability in Claxon involving Uninitialized memory exposure in claxon under CWE-908: Use of Uninitialized Resource.
Which Claxon versions are affected?
Affected versions include releases prior to 0.4.1, 0.3.2 across affected packages: claxon.
What version fixes CVE-2018-20992?
Upgrading to 0.4.1, 0.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is claxon affected?
Yes, claxon is affected in releases prior to 0.4.1, 0.3.2. Upgrade your dependency to 0.4.1, 0.3.2 or later.
What is the CVSS score of CVE-2018-20992?
CVE-2018-20992 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2018-20992?
CVE-2018-20992 is classified under CWE-908: Use of Uninitialized Resource (The product uses or accesses a resource that has not been initialized.).
How can I check crates.io dependencies for CVE-2018-20992?
Run the dependency tree command: 'inspect dependencies for claxon'. 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-8c6g-4xc5-w96c",
  "modified" : "2023-06-13T16:57:24Z",
  "published" : "2021-08-25T20:43:52Z",
  "aliases" : [ "CVE-2018-20992" ],
  "summary" : "Uninitialized memory exposure in claxon",
  "details" : "Affected versions of Claxon made an invalid assumption about the decode buffer size being a multiple of a value read from the bitstream. This could cause parts of the decode buffer to not be overwritten. If the decode buffer was newly allocated and uninitialized, this uninitialized memory could be exposed.\n\nThis allows an attacker to observe parts of the uninitialized memory in the decoded audio stream.\n\nThe flaw was corrected by checking that the value read from the bitstream divides the decode buffer size, and returning a format error if it does not. If an error is returned, the decode buffer is not exposed. Regression tests and an additional fuzzer have been added to prevent similar flaws in the future.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "claxon"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.4.0"
      }, {
        "fixed" : "0.4.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "claxon"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-20992"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ruuda/claxon/commit/8f28ec275e412dd3af4f3cda460605512faf332c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ruuda/claxon"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ruuda/claxon/releases/tag/v0.3.2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ruuda/claxon/releases/tag/v0.4.1"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2018-0004.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-908" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T21:24:16Z",
    "nvd_published_at" : null
  }
}