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sirbuvladste/BIND-9-Cache-Poisoning-PoC---CVE-2025-40778

Repository PoC0Created 2026-01-09ExploitCVE-2025-407783 files

13.3 KiB

Analysisdeepseek-v4-pro:cloud · 2026-08-11

Technical assessment

The artifact is a proof-of-concept exploit for CVE-2025-40778, a BIND 9 cache poisoning vulnerability. It includes a Python script (attacker.py) that acts as a malicious authoritative DNS server, injecting unsolicited A records into the ADDITIONAL section of a DNS response to poison the resolver's cache. A README provides step-by-step instructions to set up the vulnerable BIND server, attacker, and victim, and demonstrates the successful redirection of a victim's query to an attacker-controlled IP.

Backdoor review

No backdoor observed in reviewed code

The repository contains a proof-of-concept for CVE-2025-40778 (BIND 9 cache poisoning). The README describes the attack conceptually and provides setup instructions. The attacker.py script implements a malicious DNS server that injects an unsolicited A record for www.hacker.com into the ADDITIONAL section of a response for www.poc.lab, which is the exact behavior needed to demonstrate the vulnerability. The server.py script is a harmless Flask web page with a visual animation. No backdoor, concealed payload, or unrelated harmful behavior was observed in any of the three files.

ClassificationExploit

Model confidence95%

AuthenticationNot required

LanguagesPythonMarkdown

Target softwareBIND 9

Attack typesDNS cache poisoning

Evidence & reasoningClassification basis · observed behavior · safety review

Technical evidence

Classification basis and observed behavior

Classification basis

The artifact contains executable code (attacker.py) that actively injects unsolicited DNS records to poison a resolver's cache, which is the core mechanism of the CVE-2025-40778 vulnerability. The README provides a complete setup and demonstration of the attack, confirming its purpose as an exploit.

attacker.py:19-21README.md:5README.md:225-227

Requirements

A vulnerable BIND 9 resolver must be configured to forward queries for a domain controlled by the attacker.README.md:138-145
The attacker must run the attacker.py script on a machine reachable by the BIND resolver.README.md:220-222

Observed behavior

The attacker.py script listens on UDP port 53 and, upon receiving a query for 'www.poc.lab.', responds with a legitimate answer for that domain and an unsolicited A record for 'www.hacker.com.' in the ADDITIONAL section, pointing to the attacker's IP.attacker.py:19-21
The README demonstrates that after the attack, a victim querying the BIND resolver for 'www.hacker.com' receives the attacker's IP address (192.168.174.130) instead of the legitimate one.README.md:233-237

Safety-review evidence

Behaviors behind the backdoor verdict

Observables

DNS POISONING POC: Payload withheldThis is the core exploit behavior for CVE-2025-40778 and is consistent with the stated purpose of the PoC.attacker.py:20-21
HARMLESS WEB PAGE: Payload withheldThe server is used to demonstrate redirection after cache poisoning and contains no backdoor or harmful code.server.py:1-109

Review boundaries

What the analysis did not establish

The evidence does not include the actual execution or verification of the exploit; classification is based solely on static analysis of the provided source code and documentation.
The server.py file is a Flask web server for demonstrating redirection and is not part of the core exploit mechanism.
No binary files were present in the artifact; review is limited to the three provided text files.
The review does not assess the safety of executing the PoC in a live environment, only whether the code itself contains backdoor behavior.

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.

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