CVE-2020-36462: Syncpool Data Race Vulnerability

HIGH
Advisory Identifier: GHSA-vp6r-mrq9-8f4h
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CVSS 8.1
CWE-362 CWE-77
Published
Advisory Summary

CVE-2020-36462 is a HIGH (CVSS 8.1) data race vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Syncpool libraries in the crates.io ecosystem. The issue involves data race in syncpool. Remediation is available by upgrading affected packages to version 0.1.6.

CVE-2020-36462 at a Glance

CVE Identifier CVE-2020-36462
GHSA Identifier GHSA-vp6r-mrq9-8f4h
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Syncpool
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-2020-36462

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

syncpool fixed: 0.1.6 
Upgrade syncpool to 0.1.6
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 syncpool

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36462, inspect your project dependencies for Syncpool:

inspect dependencies for syncpool

Analyze the terminal output to locate any version of Syncpool in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.1.6), 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-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. In Syncpool, 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 this crate unconditionally implements Send for Bucket2. This allows sending non-Send types to other threads. This can lead to data races when non Send types like Cell<T> or Rc<T> are contained inside Bucket2 and sent across thread boundaries. The data races can potentially lead to memory corruption (as demonstrated in the PoC from the original report issue). The flaw was corrected in commit `15b2828` by adding a T: Send bound to the Send impl of Bucket2<T>.

CVE-2020-36462 Affected Syncpool Versions

1 component(s)
Fixed Versions:
0.1.6
Product / Package Ecosystem Affected Versions Fixed Version
syncpool
 crates.io
< 0.1.6
0.1.6

References

NVD — CVE-2020-36462 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36462
Syncpool Source Repository REPOSITORY
https://github.com/Chopinsky/byte_buffer/issues/2
Security Fix Commit FIX COMMIT
https://github.com/Chopinsky/byte_buffer/commit/15b282877d1e576de2b337d8162bbf43ed1a0f2d
Syncpool Source Repository REPOSITORY
https://github.com/Chopinsky/byte_buffer/tree/master/syncpool
raw.githubusercontent.com/rustsec/advisory-db... WEB
https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/syncpool/RUSTSEC-2020-0142.md
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0142.html

Frequently Asked Questions

What is CVE-2020-36462?
CVE-2020-36462 is a security vulnerability in Syncpool involving Data race in syncpool under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Syncpool versions are affected?
Affected versions include releases prior to 0.1.6 across affected packages: syncpool.
What version fixes CVE-2020-36462?
Upgrading to 0.1.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is syncpool affected?
Yes, syncpool is affected in releases prior to 0.1.6. Upgrade your dependency to 0.1.6 or later.
What is the CVSS score of CVE-2020-36462?
CVE-2020-36462 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-2020-36462?
CVE-2020-36462 is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check crates.io dependencies for CVE-2020-36462?
Run the dependency tree command: 'inspect dependencies for syncpool'. 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-vp6r-mrq9-8f4h",
  "modified" : "2023-06-13T21:50:03Z",
  "published" : "2021-08-25T20:58:11Z",
  "aliases" : [ "CVE-2020-36462" ],
  "summary" : "Data race in syncpool",
  "details" : "Affected versions of this crate unconditionally implements Send for Bucket2. This allows sending non-Send types to other threads. This can lead to data races when non Send types like Cell<T> or Rc<T> are contained inside Bucket2 and sent across thread boundaries. The data races can potentially lead to memory corruption (as demonstrated in the PoC from the original report issue). The flaw was corrected in commit `15b2828` by adding a T: Send bound to the Send impl of Bucket2<T>.",
  "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" : "syncpool"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.1.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36462"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Chopinsky/byte_buffer/issues/2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Chopinsky/byte_buffer/commit/15b282877d1e576de2b337d8162bbf43ed1a0f2d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Chopinsky/byte_buffer/tree/master/syncpool"
  }, {
    "type" : "WEB",
    "url" : "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/syncpool/RUSTSEC-2020-0142.md"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0142.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-362", "CWE-77" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-18T20:18:30Z",
    "nvd_published_at" : "2021-08-08T06:15:00Z"
  }
}