CVE-2020-15254: Crossbeam channel Crossbeam-channel Undefined Behavior Before V0.4.4 Vulnerability

HIGH
Advisory Identifier: GHSA-v5m7-53cv-f3hx
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CVSS 8.1
CWE-401 CWE-119
Published
Advisory Summary

CVE-2020-15254 is a HIGH (CVSS 8.1) crossbeam-channel undefined behavior before v0.4.4 vulnerability (CWE-401: Missing Release of Memory after Effective Lifetime) affecting Crossbeam channel libraries in the crates.io ecosystem. The issue involves crossbeam-channel undefined behavior before v0.4.4. Remediation is available by upgrading affected packages to version 0.4.4.

CVE-2020-15254 at a Glance

CVE Identifier CVE-2020-15254
GHSA Identifier GHSA-v5m7-53cv-f3hx
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-401: Missing Release of Memory after Effective Lifetime
Affected Product Crossbeam channel
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 8.1

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2020-15254

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

crossbeam-channel fixed: 0.4.4 
Upgrade crossbeam-channel to 0.4.4
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 crossbeam-channel

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-15254, inspect your project dependencies for Crossbeam channel:

inspect dependencies for crossbeam-channel

Analyze the terminal output to locate any version of Crossbeam channel in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.4), 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-401: Missing Release of Memory after Effective Lifetime, where the product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse. In Crossbeam channel, 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

### Impact The affected version of this crate's the `bounded` channel incorrectly assumes that `Vec::from_iter` has allocated capacity that same as the number of iterator elements. `Vec::from_iter` does not actually guarantee that and may allocate extra memory. The destructor of the `bounded` channel reconstructs `Vec` from the raw pointer based on the incorrect assumes described above. This is unsound and causing deallocation with the incorrect capacity when `Vec::from_iter` has allocated different sizes with the number of iterator elements. ### Patches This has been fixed in crossbeam-channel 0.4.4. We recommend users to upgrade to 0.4.4. ### References See https://github.com/crossbeam-rs/crossbeam/pull/533, https://github.com/crossbeam-rs/crossbeam/issues/539, and https://github.com/RustSec/advisory-db/pull/425 for more details. ### License This advisory is in the public domain.

CVE-2020-15254 Affected Crossbeam channel Versions

1 component(s)
Fixed Versions:
0.4.4
Product / Package Ecosystem Affected Versions Fixed Version
crossbeam-channel
 crates.io
≥ 0.4.3
< 0.4.4
All 1 versions
0.4.3
0.4.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-v5m7-53cv-f3hx
NVD — CVE-2020-15254 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-15254
Crossbeam channel Source Repository REPOSITORY
https://github.com/crossbeam-rs/crossbeam/issues/539
Crossbeam channel Source Repository REPOSITORY
https://github.com/RustSec/advisory-db/pull/425
Crossbeam channel Source Repository REPOSITORY
https://github.com/crossbeam-rs/crossbeam/pull/533
Crossbeam channel Source Repository REPOSITORY
https://github.com/crossbeam-rs/crossbeam
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0052.html

Frequently Asked Questions

What is CVE-2020-15254?
CVE-2020-15254 is a security vulnerability in Crossbeam channel involving crossbeam-channel Undefined Behavior before v0.4.4 under CWE-401: Missing Release of Memory after Effective Lifetime.
Which Crossbeam channel versions are affected?
Affected versions include releases prior to 0.4.4 across affected packages: crossbeam-channel.
What version fixes CVE-2020-15254?
Upgrading to 0.4.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is crossbeam-channel affected?
Yes, crossbeam-channel is affected in releases prior to 0.4.4. Upgrade your dependency to 0.4.4 or later.
What is the CVSS score of CVE-2020-15254?
CVE-2020-15254 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-15254?
CVE-2020-15254 is classified under CWE-401: Missing Release of Memory after Effective Lifetime (The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.).
How can I check crates.io dependencies for CVE-2020-15254?
Run the dependency tree command: 'inspect dependencies for crossbeam-channel'. 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-v5m7-53cv-f3hx",
  "modified" : "2022-08-10T23:46:00Z",
  "published" : "2021-08-25T21:01:13Z",
  "aliases" : [ "CVE-2020-15254" ],
  "summary" : "crossbeam-channel Undefined Behavior before v0.4.4",
  "details" : "### Impact\n\nThe affected version of this crate's the `bounded` channel incorrectly assumes that `Vec::from_iter` has allocated capacity that same as the number of iterator elements. `Vec::from_iter` does not actually guarantee that and may allocate extra memory. The destructor of the `bounded` channel reconstructs `Vec` from the raw pointer based on the incorrect assumes described above. This is unsound and causing deallocation with the incorrect capacity when `Vec::from_iter` has allocated different sizes with the number of iterator elements.\n\n### Patches\n\nThis has been fixed in crossbeam-channel 0.4.4.\n\nWe recommend users to upgrade to 0.4.4.\n\n### References\n\nSee https://github.com/crossbeam-rs/crossbeam/pull/533, https://github.com/crossbeam-rs/crossbeam/issues/539, and https://github.com/RustSec/advisory-db/pull/425 for more details.\n\n### License\n\nThis advisory is in the public domain.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "crossbeam-channel"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.4.3"
      }, {
        "fixed" : "0.4.4"
      } ]
    } ],
    "versions" : [ "0.4.3" ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-v5m7-53cv-f3hx"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-15254"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/crossbeam-rs/crossbeam/issues/539"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/RustSec/advisory-db/pull/425"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/crossbeam-rs/crossbeam/pull/533"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/crossbeam-rs/crossbeam"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0052.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-119", "CWE-401" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-03T22:53:34Z",
    "nvd_published_at" : "2020-10-16T17:15:00Z"
  }
}