CVE-2021-45694: Rdiff Window May Read From Uninitialized Vulnerability

HIGH
Advisory Identifier: GHSA-2rxc-8f9w-fjq8
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CVSS 7.5
CWE-908
Published
Advisory Summary

CVE-2021-45694 is a HIGH (CVSS 7.5) window may read from uninitialized vulnerability (CWE-908: Use of Uninitialized Resource) affecting Rdiff libraries in the crates.io ecosystem. The issue involves window may read from uninitialized memory locations in rdiff. Remediation is available in the latest vendor maintenance releases.

CVE-2021-45694 at a Glance

CVE Identifier CVE-2021-45694
GHSA Identifier GHSA-2rxc-8f9w-fjq8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-908: Use of Uninitialized Resource
Affected Product Rdiff
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/A:N).

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 None (I:N)
Availability None (A:N)

How to Fix CVE-2021-45694

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

rdiff fixed: Latest secure release 
Upgrade rdiff 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 rdiff

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-45694, inspect your project dependencies for Rdiff:

inspect dependencies for rdiff

Analyze the terminal output to locate any version of Rdiff 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-908: Use of Uninitialized Resource, where the product uses or accesses a resource that has not been initialized. In Rdiff, 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 rdiff crate through version 0.1.2 for Rust. Window may read from uninitialized memory locations.

CVE-2021-45694 Affected Rdiff Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
rdiff
 crates.io
≤ 0.1.2

References

NVD — CVE-2021-45694 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45694
Rdiff Source Repository REPOSITORY
https://github.com/dyule/rdiff/issues/3
Rdiff Source Repository REPOSITORY
https://github.com/dyule/rdiff
raw.githubusercontent.com/rustsec/advisory-db... WEB
https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/rdiff/RUSTSEC-2021-0094.md
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0094.html

Frequently Asked Questions

What is CVE-2021-45694?
CVE-2021-45694 is a security vulnerability in Rdiff involving Window may read from uninitialized memory locations in rdiff under CWE-908: Use of Uninitialized Resource.
Which Rdiff versions are affected?
Affected versions include releases prior to current release patches across affected packages: rdiff.
What version fixes CVE-2021-45694?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is rdiff affected?
Yes, rdiff 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-2021-45694?
CVE-2021-45694 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2021-45694?
CVE-2021-45694 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-2021-45694?
Run the dependency tree command: 'inspect dependencies for rdiff'. 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-2rxc-8f9w-fjq8",
  "modified" : "2023-06-13T20:24:32Z",
  "published" : "2022-01-06T22:14:13Z",
  "aliases" : [ "CVE-2021-45694" ],
  "summary" : "Window may read from uninitialized memory locations in rdiff",
  "details" : "An issue was discovered in the rdiff crate through version 0.1.2 for Rust. Window may read from uninitialized memory locations.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "rdiff"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.1.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-45694"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dyule/rdiff/issues/3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/dyule/rdiff"
  }, {
    "type" : "WEB",
    "url" : "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/rdiff/RUSTSEC-2021-0094.md"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0094.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-908" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-06T14:39:27Z",
    "nvd_published_at" : "2021-12-27T00:15:00Z"
  }
}