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CVE-2023-28119 : Exploit Details and Defense Strategies

CVE-2023-28119 exposes a DoS vulnerability in the crewjam/saml Go library, impacting versions before 0.4.13. Learn the impact, mitigation, and prevention steps.

This CVE-2023-28119 involves a vulnerability in the crewjam/saml Go library that is susceptible to a Denial of Service (DoS) via a Deflate Decompression Bomb attack.

Understanding CVE-2023-28119

This CVE exposes a weakness in the crewjam/saml library before version 0.4.13, allowing an attacker to execute a DoS attack using a Deflate Decompression Bomb.

What is CVE-2023-28119?

The crewjam/saml Go library, which implements a partial version of the Security Assertion Markup Language (SAML) standard in Golang, is impacted by a flaw. Prior to version 0.4.13, the library's use of

flate.NewReader
does not impose limits on input size. This oversight enables an attacker to send an HTTP request with over 1 MB of data, triggering server-side decompression using the Deflate algorithm. By repeatedly sending such requests, an attacker can crash the server due to process termination by the operating system. This vulnerability has been addressed in version 0.4.13.

The Impact of CVE-2023-28119

The impact of this CVE is rated as high, with a CVSSv3 base score of 7.5. Although it does not affect confidentiality or integrity, it poses a significant threat to availability, making it crucial for users to apply necessary patches and mitigations.

Technical Details of CVE-2023-28119

This section delves into the technical aspects of the vulnerability, exploring its description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in the crewjam/saml Go library allows attackers to exploit the lack of size constraints in input data processed by the Deflate algorithm, leading to a DoS condition by overwhelming the server with decompression requests.

Affected Systems and Versions

The affected system is the crewjam/saml Go library, specifically versions prior to 0.4.13. Users utilizing versions earlier than this are at risk of falling victim to the DoS attack leveraging the Deflate Decompression Bomb technique.

Exploitation Mechanism

Exploiting this vulnerability involves sending HTTP requests with excessive data, triggering server-side decompression and gradually overwhelming the system's resources until it crashes, impacting availability significantly.

Mitigation and Prevention

To safeguard systems from CVE-2023-28119 and prevent potential attacks, users are advised to take immediate steps, implement long-term security practices, and apply relevant patches and updates.

Immediate Steps to Take

Users should upgrade to version 0.4.13 or later of the crewjam/saml library to mitigate the vulnerability and protect their systems from DoS attacks leveraging Deflate Decompression Bombs.

Long-Term Security Practices

Incorporating input size validation mechanisms, implementing rate limiting on server-side processing, and adopting secure coding practices can strengthen the overall security posture and help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly monitoring for security advisories, promptly applying relevant patches released by the software vendor, and staying informed about potential threats are essential practices to mitigate risks associated with CVE-2023-28119.

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