CVE-2022-4721: Rdiffweb Rdiffweb Vulnerable To Special Element Vulnerability

MODERATE
Advisory Identifier: GHSA-83pm-7v48-5jp4
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CVSS 5.4
CWE-75
Published
Advisory Summary

CVE-2022-4721 is a MODERATE (CVSS 5.4) rdiffweb vulnerable to special element vulnerability (CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)) affecting Rdiffweb libraries in the PyPI ecosystem. The issue involves rdiffweb vulnerable to special element injection. Remediation is available by upgrading affected packages to version 2.5.5.

CVE-2022-4721 at a Glance

CVE Identifier CVE-2022-4721
GHSA Identifier GHSA-83pm-7v48-5jp4
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)
Affected Product Rdiffweb
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.4

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:R/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2022-4721

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

rdiffweb fixed: 2.5.5 
pip install rdiffweb>=2.5.5
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show rdiffweb

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2022-4721, inspect your installed packages using pip:

pip show rdiffweb

Analyze the terminal output to locate any version of Rdiffweb in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.5.5), your application is affected.

Note: The pip show rdiffweb command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection), where the product does not adequately filter user-controlled input for special elements with control implications. In Rdiffweb, 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

In rdiffweb prior to 2.5.5, lack of sanitisation of characters in SSH key name could allow attacker to inject a hyperlink injection that could allow attacker to redirect victim to malicious websites.

CVE-2022-4721 Affected Rdiffweb Versions

1 component(s)
Fixed Versions:
2.5.5
Product / Package Ecosystem Affected Versions Fixed Version
rdiffweb
pypi/rdiffweb
PyPI
< 2.5.5
2.5.5

References

NVD — CVE-2022-4721 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-4721
Security Fix Commit FIX COMMIT
https://github.com/ikus060/rdiffweb/commit/6afaae56a29536f0118b3380d296c416aa6d078d
Rdiffweb Source Repository REPOSITORY
https://github.com/ikus060/rdiffweb
Rdiffweb Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/rdiffweb/PYSEC-2022-43007.yaml
huntr.dev/bounties/3c48ef5d-d... WEB
https://huntr.dev/bounties/3c48ef5d-da4d-4ee4-aaca-af65e7273720

Frequently Asked Questions

What is CVE-2022-4721?
CVE-2022-4721 is a security vulnerability in Rdiffweb involving rdiffweb vulnerable to Special Element Injection under CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection).
Which Rdiffweb versions are affected?
Affected versions include releases prior to 2.5.5 across affected packages: rdiffweb.
What version fixes CVE-2022-4721?
Upgrading to 2.5.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is rdiffweb affected?
Yes, rdiffweb is affected in releases prior to 2.5.5. Upgrade your dependency to 2.5.5 or later.
What is the CVSS score of CVE-2022-4721?
CVE-2022-4721 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2022-4721?
CVE-2022-4721 is classified under CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) (The product does not adequately filter user-controlled input for special elements with control implications.).
How can I check PyPI dependencies for CVE-2022-4721?
Run the dependency tree command: 'pip show rdiffweb'. 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-83pm-7v48-5jp4",
  "modified" : "2024-10-25T21:41:41Z",
  "published" : "2022-12-27T15:30:19Z",
  "aliases" : [ "CVE-2022-4721" ],
  "summary" : "rdiffweb vulnerable to Special Element Injection",
  "details" : "In rdiffweb prior to 2.5.5, lack of sanitisation of characters in SSH key name could allow attacker to inject a hyperlink injection that could allow attacker to redirect victim to malicious websites.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "rdiffweb"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.5.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-4721"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ikus060/rdiffweb/commit/6afaae56a29536f0118b3380d296c416aa6d078d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ikus060/rdiffweb"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/rdiffweb/PYSEC-2022-43007.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/3c48ef5d-da4d-4ee4-aaca-af65e7273720"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-75" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-30T18:01:57Z",
    "nvd_published_at" : "2022-12-27T15:15:00Z"
  }
}