CVE-2020-35885: Alpm rs Double Free Vulnerability

CRITICAL
Advisory Identifier: GHSA-qc4m-gc8r-mg8m
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CVSS 9.8
CWE-415
Published
Advisory Summary

CVE-2020-35885 is a CRITICAL (CVSS 9.8) double free vulnerability (CWE-415: Double Free) affecting Alpm rs libraries in the crates.io ecosystem. The issue involves double free in alpm-rs. Remediation is available in the latest vendor maintenance releases.

CVE-2020-35885 at a Glance

CVE Identifier CVE-2020-35885
GHSA Identifier GHSA-qc4m-gc8r-mg8m
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-415: Double Free
Affected Product Alpm rs
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-2020-35885

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

alpm-rs fixed: Latest secure release 
Upgrade alpm-rs to Latest secure release
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 alpm-rs

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35885, inspect your project dependencies for Alpm rs:

inspect dependencies for alpm-rs

Analyze the terminal output to locate any version of Alpm rs in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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 Alpm rs, 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 alpm-rs crate through 2020-08-20 for Rust. StrcCtx performs improper memory deallocation.

CVE-2020-35885 Affected Alpm rs Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
alpm-rs
 crates.io
≤ 0.1.24

References

NVD — CVE-2020-35885 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35885
Alpm rs Source Repository REPOSITORY
https://github.com/pigeonhands/rust-arch/issues/2
Alpm rs Source Repository REPOSITORY
https://github.com/BahNahNah/rust-arch/tree/master/alpm-rs
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0032.html

Frequently Asked Questions

What is CVE-2020-35885?
CVE-2020-35885 is a security vulnerability in Alpm rs involving Double free in alpm-rs under CWE-415: Double Free.
Which Alpm rs versions are affected?
Affected versions include releases prior to current release patches across affected packages: alpm-rs.
What version fixes CVE-2020-35885?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is alpm-rs affected?
Yes, alpm-rs is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2020-35885?
CVE-2020-35885 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-2020-35885?
CVE-2020-35885 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-2020-35885?
Run the dependency tree command: 'inspect dependencies for alpm-rs'. 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-qc4m-gc8r-mg8m",
  "modified" : "2021-08-19T20:56:12Z",
  "published" : "2021-08-25T20:48:59Z",
  "aliases" : [ "CVE-2020-35885" ],
  "summary" : "Double free in alpm-rs",
  "details" : "An issue was discovered in the alpm-rs crate through 2020-08-20 for Rust. StrcCtx performs improper memory deallocation.",
  "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" : "alpm-rs"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.1.24"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35885"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pigeonhands/rust-arch/issues/2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/BahNahNah/rust-arch/tree/master/alpm-rs"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0032.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-415" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T20:56:12Z",
    "nvd_published_at" : "2020-12-31T10:15:00Z"
  }
}