CVE-2023-47124 : Exploit Details and Defense Strategies

This article provides detailed information about CVE-2023-47124, a vulnerability affecting Traefik relating to Denial of Service with ACME HTTPChallenge.

Understanding CVE-2023-47124

CVE-2023-47124 is a vulnerability in Traefik, an open-source HTTP reverse proxy and load balancer. It involves a denial of service risk due to the exploitation of the ACME HTTPChallenge.

What is CVE-2023-47124?

Traefik, when using the

HTTPChallenge

to generate and renew Let's Encrypt TLS certificates, allows attackers to carry out a slowloris attack by exploiting the delay in solving the challenge.

The Impact of CVE-2023-47124

The vulnerability affects Traefik versions prior to 2.10.6 and versions between 3.0.0-beta1 and 3.0.0-beta5. Attackers can disrupt service availability by launching a slowloris attack.

Technical Details of CVE-2023-47124

This section covers specific technical details related to the CVE-2023-47124 vulnerability.

Vulnerability Description

The issue arises when Traefik's

HTTPChallenge

is used for Let's Encrypt TLS certificates, allowing attackers to exploit a delay and conduct a slowloris attack.

Affected Systems and Versions

Traefik versions prior to 2.10.6 and versions between 3.0.0-beta1 and 3.0.0-beta5 are vulnerable to this exploit.

Exploitation Mechanism

Attackers can take advantage of the delay involved in solving the challenge during Let's Encrypt TLS certificate generation, leading to a slowloris attack.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-47124, users and administrators should take the following steps:

Immediate Steps to Take

Upgrade Traefik to version 2.10.6 or 3.0.0-beta5 to patch the vulnerability.

Long-Term Security Practices

Consider switching from using the

HTTPChallenge

to the

TLSChallenge

or

DNSChallenge

within Traefik configurations.

Patching and Updates

Regularly monitor Traefik's official updates and apply patches promptly to stay protected against potential vulnerabilities.