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CVE-2023-49568: Denial of Service Vulnerability in go-git Prior to v5.11

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Overview

This report provides an in-depth analysis of a significant vulnerability identified as CVE-2023-49568. This vulnerability primarily affects applications using go-git versions prior to v5.11, making them susceptible to Denial of Service (DoS) attacks. It is crucial to understand and address this vulnerability promptly due to its potential to compromise systems and lead to data leakage.

Vulnerability Summary

CVE ID: CVE-2023-49568
Severity: High, CVSS Score 7.5
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, potential system compromise or data leakage

Affected Products

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Product | Affected Versions

go-git | Prior to v5.11

How the Exploit Works

The vulnerability involves the ability for an attacker to provide specially crafted responses from a Git server, which triggers resource exhaustion in go-git clients. This is primarily a go-git implementation issue and does not affect the upstream git cli. Applications using only the in-memory filesystem supported by go-git are not affected by this vulnerability.

Conceptual Example Code

Below is a conceptual example of how an attacker might exploit this vulnerability. This pseudocode demonstrates a malicious payload sent from a Git server to a go-git client, leading to resource exhaustion.

class MaliciousServer:
def craft_response(self):
# Craft a response that triggers resource exhaustion in go-git clients
response = {
"resource": "overload",
}
return response
class VulnerableClient:
def process_response(self, response):
# Processing this response leads to resource exhaustion
process(response)

Please note that this is a simplified conceptual example and the actual code may vary significantly.

Recommendations for Mitigation

To mitigate this vulnerability, apply the vendor patch as soon as it is available. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure.

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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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