CVE-2024-42009 Exploit Metadata

PoC files

11 files

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Analysisdeepseek-v4-pro:cloud · 2026-08-12

Technical assessment

The artifact is a set of Nuclei templates and documentation for detecting CVE-2024-42009, a reflected XSS vulnerability in Roundcube. The templates send HTTP requests with crafted payloads and use matchers to check for reflection of markers or out-of-band callbacks, but do not execute the XSS payload in a browser or perform any exploitation actions.

Backdoor review

No backdoor observed in reviewed code

The supplied evidence consists of two Nuclei YAML templates and a README for CVE-2024-42009, a reflected XSS vulnerability in Roundcube. The templates use standard Nuclei features (HTTP requests, matchers, extractors, Interactsh OOB callbacks) to detect the vulnerability. No concealed executable behavior, persistence mechanisms, credential theft, or unrelated payloads are present. The README describes the vulnerability and provides lab setup instructions. All observed behavior is consistent with a legitimate proof-of-concept for the stated CVE.

ClassificationScanner

Model confidence95%

AuthenticationNot required

LanguagesYAMLMarkdown

Target softwareRoundcube Webmail

Attack typesCross-Site Scripting (XSS)

Evidence & reasoningClassification basis · observed behavior · safety review

Technical evidence

Classification basis and observed behavior

Classification basis

The primary artifact consists of Nuclei templates that send crafted requests and use matchers to detect reflection or out-of-band callbacks. This behavior is consistent with a scanner, which checks for the presence of a vulnerability without exploiting it. The templates do not contain code to open emails in a browser, trigger JavaScript execution, or perform any post-exploitation actions like stealing emails.

CVE-2024-42009-OOB & Interactsh.yaml:16-19CVE-2024-42009.yaml:8-10README.md:23-25

Requirements

A target running a vulnerable version of Roundcube Webmail (<= 1.6.7 or <= 1.5.7).README.md:16
For OOB template, an Interactsh server or equivalent out-of-band callback listener must be configured.CVE-2024-42009-OOB & Interactsh.yaml:12-13

Observed behavior

Sends HTTP GET requests to Roundcube endpoints (root, compose, show) with injected XSS payloads and unique markers.CVE-2024-42009-OOB & Interactsh.yaml:59-60CVE-2024-42009.yaml:57
Checks HTTP responses for the presence of injected markers, Roundcube session cookies, or version strings to determine if the target is vulnerable.CVE-2024-42009.yaml:58-70CVE-2024-42009-OOB & Interactsh.yaml:64-75
Uses out-of-band (OOB) matchers to detect DNS or HTTP callbacks to an Interactsh server, indicating potential JavaScript execution.CVE-2024-42009-OOB & Interactsh.yaml:66-70

Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Interactsh Url: {{interactsh-url}}Nuclei placeholder for Out-of-Band interaction testing; used to confirm JavaScript execution in a controlled lab environment.CVE-2024-42009-OOB & Interactsh.yaml:40CVE-2024-42009-OOB & Interactsh.yaml:59CVE-2024-42009-OOB & Interactsh.yaml:80
Xss Payload: 1'><body title='bgcolor=foo' name='bar' style='animation-name:progress-bar-stripes' onanimationstart='alert(origin)'>Foo</body>Crafted XSS payload used in the non-OOB template to trigger JavaScript execution in the vulnerable Roundcube endpoint.CVE-2024-42009.yaml:35
Google Drive Link: https://drive.google.com/file/d/1PkHgNgxL-TUFnGMXjkbLJYVmzCuqASxW/viewLink to a video demonstration of the exploit chain; the content of the video is not included in the evidence and cannot be reviewed.README.md:71

Review boundaries

What the analysis did not establish

The evidence packet reports complete_artifact_coverage as false, indicating that not all files from the repository are included. Four non-text media files and four unclassified files are present but not analyzed.
The analysis is based solely on the provided text content; the actual behavior of the templates when executed by a Nuclei engine is not observed.
Four non-text media files (e.g., Images/ screenshots, docker-compose.yml) totaling 763,427 bytes were not analyzed; their content could contain additional information not reflected in this review.
The video demonstration linked in the README (Google Drive) was not reviewed; its content is unknown.
Four text files (totaling 31,178 bytes) were omitted from the evidence packet and not reviewed.

Model interpretation

This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.

Docker lab environments

GitHub

docker-compose.yaml

Created 2025-09-14Vuln labCVE-2024-42009Compose · images

1 Compose manifest · 2 services

Analysisdeepseek-v4-pro:cloud · 2026-08-07

Environment assessment

A Docker Compose environment defining a Roundcube Webmail instance (version 1.6.7-fpm) with an Nginx reverse proxy, intended as a lab to demonstrate CVE-2024-42009, a reflected XSS vulnerability.

docker-compose.yaml:1-28README.md:1-129

Lab assessment

Vulnerability lab

The README explicitly states the repository contains a Nuclei template and supporting resources to safely demonstrate and validate CVE-2024-42009, a critical reflected XSS vulnerability in Roundcube Webmail. The Docker Compose file sets up a vulnerable Roundcube instance (version 1.6.7-fpm) and an Nginx proxy, matching the lab setup described in the README.

README.md:3-7docker-compose.yaml:4-5

Lab shapeCompose · images

Services2

Compose manifests1

Dockerfiles0

Evidence & reasoningComponents · CVE assessment · exercise context · review boundaries

Components

Services and files described by the evidence

roundcube

vulnerable web application target

Roundcube Webmail version 1.6.7-fpm, configured with SQLite database and Gmail IMAP/SMTP settings. It is the target of the CVE-2024-42009 XSS vulnerability. The service mounts a named volume 'roundcube_data' at /var/www/html.

docker-compose.yaml:4-15

nginx

reverse proxyweb server

Nginx latest image acting as a reverse proxy for the Roundcube FPM service. It exposes port 8080 on the host, mounts the same 'roundcube_data' volume, and uses a custom nginx.conf to pass PHP requests to the roundcube service on port 9000.

docker-compose.yaml:17-24nginx.conf:1-18

CVE assessment

How the supplied evidence relates each vulnerability

CVE-2024-42009

Supported by supplied evidence

The README explicitly identifies the repository as a PoC for CVE-2024-42009, describes the vulnerability in Roundcube's message_body() function, and the Docker Compose file deploys a vulnerable Roundcube version (1.6.7-fpm) which is within the affected range (≤ 1.6.7).

README.md:3-7README.md:15-19docker-compose.yaml:4-5

Exercise context

Requirements and sequence described by the evidence

Prerequisites

Docker and Docker Compose must be installed to run the lab environment.README.md:37-40
The lab expects the user to send a crafted email containing a malicious HTML payload to the Roundcube instance, which requires an SMTP server or MailHog (mentioned in README but not included in the provided compose file).README.md:27-30README.md:37-40
An Interactsh or similar OOB listener is needed to receive callbacks confirming XSS execution.README.md:23-30

Evidence-described exercise path

Clone the repository and start the lab environment using 'docker compose up -d'.README.md:37-40
Access the Roundcube UI at http://localhost:8080 and log in (the README warns against using a real Google account).README.md:42-44
Send a crafted email containing an XSS payload (e.g., using <body onanimationstart=...>) to the Roundcube instance.README.md:27-30README.md:77-95
Open the malicious email in the Roundcube UI to trigger the XSS.README.md:27-30
Confirm the vulnerability by observing a DNS or HTTP callback to the Interactsh domain.README.md:27-30

Safety-review evidence

Behaviors behind the stored safety assessment

No harmful behavior observed

The Docker Compose file defines a standard lab setup with a vulnerable Roundcube instance and an Nginx proxy. It does not include any privileged mode, host filesystem mounts beyond the lab's own nginx.conf, or commands that escape the container. The README explicitly states the PoC is for educational and authorized testing only. No hidden or unnecessary behavior targeting the host or external systems is visible.

docker-compose.yaml:1-28README.md:9

Review boundaries

What the analysis did not establish

The provided docker-compose.yaml does not include a MailHog or SMTP service, which the README mentions as part of the lab setup. This omission may affect the ability to send emails to the Roundcube instance without additional configuration.
The Nuclei templates and other repository files (e.g., CVE-2024-42009.yaml) are not included in the evidence packet, so their content and behavior cannot be assessed.
The README references a video demonstration and external PoC repositories, but these are not part of the supplied evidence.

Model interpretation

This review is limited to the supplied lab evidence packet. It does not assert that the environment runs, reproduces a vulnerability, or is safe to execute. Contract: eip-docker-lab-analysis-v1.

Linked vulnerabilities

CVE-2024-42009