Vulnerability Summary

CVE ID: CVE-2025-67079
Product: Omnispace Agora (self-hosted deployments)
Affected Versions: All versions prior to 25.10
Vulnerability Type: Unrestricted file upload leading to Remote Code Execution
Attack Vector: Network
Authentication Required: No
User Interaction: No
CVSS v3.1 Score: 9.8 (Critical)
Impact: Full system compromise (Confidentiality, Integrity, Availability)

Executive Overview

CVE-2025-67079 is a critical remote code execution vulnerability in Omnispace Agora caused by unsafe handling of uploaded files that are later processed by ImageMagick for preview or thumbnail generation.

An attacker can upload a specially crafted PDF or image file that abuses ImageMagick’s internal scripting and delegate processing mechanisms. When Agora automatically processes the file, arbitrary system commands can be executed on the server with the privileges of the web service user.

This issue is remotely exploitable, requires no authentication, and impacts any public-facing Agora instance that allows file uploads and performs server-side image or document conversion.

Technical Root Cause

• Agora allows users to upload files such as PDFs or images.
• Uploaded files are passed to ImageMagick for thumbnail or preview generation.
• ImageMagick supports advanced scripting and delegate functionality (MSL / MVG / external command delegates).
• Crafted files can embed instructions that ImageMagick interprets during processing.
• Agora does not sufficiently restrict:
  • File content validation
  • Dangerous ImageMagick coders
  • Delegate execution
• As a result, arbitrary commands can be executed on the host system.

Exploitation Flow

1. Craft Malicious File
   The attacker creates a PDF or image containing embedded ImageMagick scripting instructions designed to trigger command execution.
2. Upload File
   The file is uploaded via a public Agora upload endpoint (for example, document uploads or temporary upload APIs).
3. Automatic Processing
   Agora invokes ImageMagick to generate thumbnails or previews.
4. Command Execution
   ImageMagick processes the embedded instructions, resulting in arbitrary command execution.
5. Post-Exploitation
   The attacker may:
   • Drop a web shell
   • Exfiltrate sensitive data
   • Create new users
   • Pivot to other systems

Proof of Concept / Exploit Availability

(Educational and Defensive Awareness Only)

• The exploitation technique is well understood and based on known ImageMagick abuse patterns.
• While a polished public exploit tool may not be widespread, manual exploitation is feasible using crafted PDF/image payloads.
• Because the attack relies on default behavior, exploitation does not require complex conditions.

Important: Due to the simplicity of the attack path, this vulnerability should be treated as actively exploitable even without a published exploit kit.

MITRE Mapping

CWE

• CWE-434 – Unrestricted Upload of File with Dangerous Type

MITRE ATT&CK

• T1190 – Exploit Public-Facing Application
• T1203 – Exploitation for Client Execution
• T1059 – Command and Scripting Interpreter
• T1105 – Ingress Tool Transfer (post-exploitation)

Detection & Monitoring Guidance

Recommended Log Sources

To detect exploitation attempts or successful compromise, monitor:

1. Web Server Logs
   • Upload endpoints (POST /upload, /UploadTmpFile, /file)
   • Suspicious content types (application/pdf)
   • Large or abnormal payload sizes
2. Application Logs
   • File upload success events
   • Thumbnail or preview generation errors
   • Imagick or conversion warnings
3. Process Execution Logs (EDR / Auditd)
   • Execution of:
     • convert
     • magick
     • gs
   • Executed by web users (www-data, apache, nginx)
4. Filesystem Monitoring
   • New files created in upload directories
   • Unexpected .php, .sh, or executable files
5. Network / Egress Logs
   • Outbound connections from the web server
   • DNS requests following file uploads

Indicators of Suspicious Activity

• PDF uploads immediately followed by ImageMagick execution
• Image processing commands spawning shells or child processes
• Upload directories containing executable scripts
• Sudden outbound traffic from a normally inbound-only server

Sample Snort Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-67079 Possible ImageMagick PDF Upload Exploit Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"application/pdf"; http_header;
    pcre:"/\/(upload|UploadTmpFile|file)/i";
    classtype:web-application-attack;
    sid:202567079;
    rev:1;
)

Note: This rule is meant for detection and triage. Tune paths and content based on your environment.

Defensive Hardening

Short-term risk reduction steps:

1. Disable PDF uploads unless absolutely required.
2. Disable automatic thumbnail generation for user-uploaded files.
3. Harden ImageMagick configuration:
   • Disable MSL, MVG, URL, and delegate coders via policy.xml.
4. Isolate image processing:
   • Run conversions in a sandboxed container or separate service.
5. Remove execute permissions from upload directories.
6. Apply strict MIME-type and magic-byte validation.

These steps do not replace patching, but they significantly reduce exploitability.

Official Patch / Upgrade

The vulnerability is fully addressed in Agora version 25.10 and later.

Official Upgrade Link

https://github.com/Agora-Project/Agora/releases

All affected installations should be upgraded immediately. No configuration-only workaround provides equivalent protection.

Final Takeaway

• Likelihood of Exploitation: High
• Impact if Exploited: Total server compromise
• Exposure: Any public Agora instance with file uploads enabled
• Action Required: Immediate upgrade + log review