CVE-2020-35883: Mozwire Path Traversal Vulnerability

CRITICAL
Advisory Identifier: GHSA-4vhw-4rw7-jfpv
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CVSS 9.1
CWE-22
Published
Advisory Summary

CVE-2020-35883 is a CRITICAL (CVSS 9.1) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Mozwire libraries in the crates.io ecosystem. The issue involves path traversal in mozwire. Remediation is available by upgrading affected packages to version 0.5.0.

CVE-2020-35883 at a Glance

CVE Identifier CVE-2020-35883
GHSA Identifier GHSA-4vhw-4rw7-jfpv
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Mozwire
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 9.1

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:N/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 None (C:N)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2020-35883

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

mozwire fixed: 0.5.0 
Upgrade mozwire to 0.5.0
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 mozwire

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35883, inspect your project dependencies for Mozwire:

inspect dependencies for mozwire

Analyze the terminal output to locate any version of Mozwire in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.5.0), 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Mozwire, 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 mozwire crate through 2020-08-18 for Rust. A ../ directory-traversal situation allows overwriting local files that have .conf at the end of the filename.

CVE-2020-35883 Affected Mozwire Versions

1 component(s)
Fixed Versions:
0.5.0
Product / Package Ecosystem Affected Versions Fixed Version
mozwire
 crates.io
< 0.5.0
0.5.0

References

NVD — CVE-2020-35883 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35883
Mozwire Source Repository REPOSITORY
https://github.com/NilsIrl/MozWire/issues/14
Mozwire Source Repository REPOSITORY
https://github.com/NilsIrl/MozWire/pull/17/commits/dd0639bf2876773b66382f47285f7db701f628d9
Mozwire Source Repository REPOSITORY
https://github.com/NilsIrl/MozWire
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0030.html

Frequently Asked Questions

What is CVE-2020-35883?
CVE-2020-35883 is a security vulnerability in Mozwire involving Path traversal in mozwire under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Mozwire versions are affected?
Affected versions include releases prior to 0.5.0 across affected packages: mozwire.
What version fixes CVE-2020-35883?
Upgrading to 0.5.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mozwire affected?
Yes, mozwire is affected in releases prior to 0.5.0. Upgrade your dependency to 0.5.0 or later.
What is the CVSS score of CVE-2020-35883?
CVE-2020-35883 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
What CWE is associated with CVE-2020-35883?
CVE-2020-35883 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check crates.io dependencies for CVE-2020-35883?
Run the dependency tree command: 'inspect dependencies for mozwire'. 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-4vhw-4rw7-jfpv",
  "modified" : "2023-02-09T14:23:48Z",
  "published" : "2021-08-25T20:49:02Z",
  "aliases" : [ "CVE-2020-35883" ],
  "summary" : "Path traversal in mozwire",
  "details" : "An issue was discovered in the mozwire crate through 2020-08-18 for Rust. A ../ directory-traversal situation allows overwriting local files that have .conf at the end of the filename.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "mozwire"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35883"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/NilsIrl/MozWire/issues/14"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/NilsIrl/MozWire/pull/17/commits/dd0639bf2876773b66382f47285f7db701f628d9"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/NilsIrl/MozWire"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0030.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T20:56:07Z",
    "nvd_published_at" : "2020-12-31T10:15:00Z"
  }
}