CVE-2021-32772 – This vulnerability allows attackers to inject m... (How to Fix)

Q: What is the severity of CVE-2021-32772?

CVE-2021-32772 has a CVSS score of 8.8 (HIGH). This vulnerability allows attackers to inject malicious HTML/JavaScript into podcast feeds, which Poddycast renders without sanitization. As an Electron application, this cross-site scripting can escalate to remote code execution, enabling command execution on the victim's machine. All users running Poddycast versions before 0.8.1 are affected.

📋 TL;DR

This vulnerability allows attackers to inject malicious HTML/JavaScript into podcast feeds, which Poddycast renders without sanitization. As an Electron application, this cross-site scripting can escalate to remote code execution, enabling command execution on the victim's machine. All users running Poddycast versions before 0.8.1 are affected.

💻 Affected Systems

Products:

Poddycast

Versions: All versions prior to 0.8.1

Operating Systems: Windows, macOS, Linux

Default Config Vulnerable: ⚠️ Yes

Notes: All default installations are vulnerable. The vulnerability exists in how podcast feed data is rendered without sanitization.

📦 What is this software?

Poddycast by Electronjs

View all CVEs affecting Poddycast →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Full remote code execution on the client machine, allowing attackers to install malware, steal data, or compromise the system.

🟠

Likely Case

Arbitrary JavaScript execution in the application context, potentially leading to data theft, session hijacking, or further exploitation.

🟢

If Mitigated

Limited to same-origin JavaScript execution if proper sandboxing is in place, but Electron's nodeIntegration often bypasses this.

🌐 Internet-Facing: HIGH - Attackers can host malicious podcast feeds on the internet that victims subscribe to.

🏢 Internal Only: MEDIUM - Requires users to subscribe to malicious feeds, which could be distributed internally.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires creating a malicious podcast feed with HTML/JS payloads. The advisory includes technical details showing the vulnerable code paths.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 0.8.1

Vendor Advisory: https://github.com/MrChuckomo/poddycast/security/advisories/GHSA-wjmh-9fj2-rqh6

Restart Required: Yes

Instructions:

1. Download Poddycast version 0.8.1 or later from the official repository. 2. Uninstall the old version. 3. Install the new version. 4. Restart the application.

🔧 Temporary Workarounds

Disable automatic feed updates

all

Prevent automatic fetching of new podcast episodes which could contain malicious payloads

Use feed sanitization proxy

all

Route all podcast feeds through a proxy that sanitizes HTML content before it reaches Poddycast

🧯 If You Can't Patch

Discontinue use of Poddycast and switch to alternative podcast applications
Implement network-level controls to block access to untrusted podcast feed sources

🔍 How to Verify

Check if Vulnerable:

Check the application version in Poddycast settings or via 'About' menu. If version is below 0.8.1, it is vulnerable.

Check Version:

Check 'About Poddycast' in the application menu or look for version information in the application's settings panel.

Verify Fix Applied:

After updating, verify the version is 0.8.1 or higher. Test by subscribing to a test feed with HTML content to ensure it's properly sanitized.

📡 Detection & Monitoring

Log Indicators:

Unusual HTML/JavaScript content in podcast feed parsing logs
Unexpected child process spawns from Poddycast

Network Indicators:

Connections to unusual podcast feed URLs
Downloads of podcast feeds containing script tags or event handlers

SIEM Query:

process_name:"Poddycast" AND (process_spawn:* OR network_connection_to:unusual_domain)

📊 Metadata

CVE ID: CVE-2021-32772

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-78

Published: August 3, 2021

Last Updated: November 21, 2024

🔗 References

https://github.com/MrChuckomo/poddycast/blob/8d31daa5cee04a389ec35f974959ea3fe4638be9/app/js/favorite.js#L4-L14 Third Party Advisory
https://github.com/MrChuckomo/poddycast/blob/8d31daa5cee04a389ec35f974959ea3fe4638be9/app/js/feed.js#L285 Third Party Advisory
https://github.com/MrChuckomo/poddycast/blob/8d31daa5cee04a389ec35f974959ea3fe4638be9/app/js/helper/helper_entries.js#L80 Third Party Advisory
https://github.com/MrChuckomo/poddycast/security/advisories/GHSA-wjmh-9fj2-rqh6 Third Party Advisory
https://github.com/MrChuckomo/poddycast/blob/8d31daa5cee04a389ec35f974959ea3fe4638be9/app/js/favorite.js#L4-L14 Third Party Advisory
https://github.com/MrChuckomo/poddycast/blob/8d31daa5cee04a389ec35f974959ea3fe4638be9/app/js/feed.js#L285 Third Party Advisory
https://github.com/MrChuckomo/poddycast/blob/8d31daa5cee04a389ec35f974959ea3fe4638be9/app/js/helper/helper_entries.js#L80 Third Party Advisory
https://github.com/MrChuckomo/poddycast/security/advisories/GHSA-wjmh-9fj2-rqh6 Third Party Advisory

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