CVE-2021-28133: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-qj56-qx26-7qr8
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CWE-200
Published
Advisory Summary

CVE-2021-28133 is a MODERATE security vulnerability vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.. Remediation is available in the latest vendor maintenance releases.

CVE-2021-28133 at a Glance

CVE Identifier CVE-2021-28133
GHSA Identifier GHSA-qj56-qx26-7qr8
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2021-28133

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

Verify Direct and Transitive Dependencies

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

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-28133, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software 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: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Software, 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

Zoom through 5.5.4 sometimes allows attackers to read private information on a participant's screen, even though the participant never attempted to share the private part of their screen. When a user shares a specific application window via the Share Screen functionality, other meeting participants can briefly see contents of other application windows that were explicitly not shared. The contents of these other windows can (for instance) be seen for a short period of time when they overlay the shared window and get into focus. (An attacker can, of course, use a separate screen-recorder application, unsupported by Zoom, to save all such contents for later replays and analysis.) Depending on the unintentionally shared data, this short exposure of screen contents may be a more or less severe security issue.

References

NVD — CVE-2021-28133 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-28133
thehackernews.com/2021/03/new-zoom-sc... WEB
https://thehackernews.com/2021/03/new-zoom-screen-sharing-bug-lets-other.html
www.syss.de/fileadmin/dokumente... WEB
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-044.txt
www.syss.de/pentest-blog/syss-2... WEB
https://www.syss.de/pentest-blog/syss-2020-044-sicherheitsproblem-in-screen-sharing-funktionalitaet-von-zoom-cve-2021-28133
www.youtube.com/watch WEB
https://www.youtube.com/watch?v=SonmmgQlLzg
Software Security Information SECURITY
https://zoom.us/trust/security/security-bulletin
Software Security Information SECURITY
http://packetstormsecurity.com/files/161897/Zoom-5.4.3-54779.1115-5.5.4-13142.0301-Information-Disclosure.html
seclists.org/fulldisclosure/2021... WEB
http://seclists.org/fulldisclosure/2021/Mar/48

Frequently Asked Questions

What is CVE-2021-28133?
CVE-2021-28133 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2021-28133?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2021-28133?
CVE-2021-28133 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Maven dependencies for CVE-2021-28133?
Run the dependency tree command: 'mvn dependency:tree'. 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-qj56-qx26-7qr8",
  "modified" : "2022-05-24T17:44:52Z",
  "published" : "2022-05-24T17:44:52Z",
  "aliases" : [ "CVE-2021-28133" ],
  "details" : "Zoom through 5.5.4 sometimes allows attackers to read private information on a participant's screen, even though the participant never attempted to share the private part of their screen. When a user shares a specific application window via the Share Screen functionality, other meeting participants can briefly see contents of other application windows that were explicitly not shared. The contents of these other windows can (for instance) be seen for a short period of time when they overlay the shared window and get into focus. (An attacker can, of course, use a separate screen-recorder application, unsupported by Zoom, to save all such contents for later replays and analysis.) Depending on the unintentionally shared data, this short exposure of screen contents may be a more or less severe security issue.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-28133"
  }, {
    "type" : "WEB",
    "url" : "https://thehackernews.com/2021/03/new-zoom-screen-sharing-bug-lets-other.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-044.txt"
  }, {
    "type" : "WEB",
    "url" : "https://www.syss.de/pentest-blog/syss-2020-044-sicherheitsproblem-in-screen-sharing-funktionalitaet-von-zoom-cve-2021-28133"
  }, {
    "type" : "WEB",
    "url" : "https://www.youtube.com/watch?v=SonmmgQlLzg"
  }, {
    "type" : "WEB",
    "url" : "https://zoom.us/trust/security/security-bulletin"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/161897/Zoom-5.4.3-54779.1115-5.5.4-13142.0301-Information-Disclosure.html"
  }, {
    "type" : "WEB",
    "url" : "http://seclists.org/fulldisclosure/2021/Mar/48"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2021-03-18T14:15:00Z"
  }
}