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The vulnerability exists in the `DownloadTinyFile` method of the scheduler, which uses a hardcoded HTTP scheme for constructing download URLs. This lack of encryption allows a network-level attacker to perform a Man-in-the-Middle (MitM) attack. The attacker can intercept the plaintext HTTP request made from one peer to another to download a file chunk. By chaining this with a separate integrity check vulnerability (TOB-DF2-15), the attacker can replace the legitimate file data with a malicious payload during transmission. The weak integrity checks fail to detect this unauthorized modification, causing the target peer to accept and use the tampered, malicious file, leading to potential code execution or system compromise.
Platform: Dragonfly
Version: <2.1.0
Vulnerability : MITM
Severity: Critical
date: 2022-09-29
Prediction: 2022-10-13
What Undercode Say:
Simulating the vulnerable HTTP request curl -v "http://victim-host:65001/download/abc/task123?peerId=attacker-id" Intercepting traffic with a tool like mitmproxy mitmproxy --mode transparent --showhost Example of a replaced malicious file echo "malicious content" > fake_download
// Vulnerable code snippet (simplified)
targetURL := url.URL{
Scheme: "http", // Vulnerable: hardcoded HTTP
Host: fmt.Sprintf("%s:%d", p.Host.IP, p.Host.DownloadPort),
Path: fmt.Sprintf("download/%s/%s", p.Task.ID[:3], p.Task.ID),
}
How Exploit:
Intercept peer HTTP traffic.
Replace downloaded file payload.
Bypass weak integrity checks.
Protection from this CVE
Upgrade to v2.1.0.
Enforce HTTPS communications.
Implement strong integrity validation.
Impact:
Arbitrary code execution
Network compromise
Data integrity loss
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Sources:
Reported By: github.com
Extra Source Hub:
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