CVE-2023-47640 : What You Need to Know
Learn about CVE-2023-47640, a vulnerability in DataHub where attackers can exploit HMAC-SHA1 to gain escalated privileges. Mitigate risk with updates and secure session practices.
This article provides detailed information about CVE-2023-47640, a vulnerability related to the insecure use of HMAC-SHA1 for session signing in DataHub.
Understanding CVE-2023-47640
This section delves into the description, impact, technical details, and mitigation strategies for CVE-2023-47640.
What is CVE-2023-47640?
CVE-2023-47640 involves an insecure usage of HMAC-SHA1 for session signing in DataHub, potentially allowing attackers to crack session signatures and gain escalated privileges.
The Impact of CVE-2023-47640
The vulnerability can be exploited by authenticated attackers to crack the signing key for DataHub, leading to the generation of privileged session cookies and unauthorized access.
Technical Details of CVE-2023-47640
This section outlines the vulnerability description, affected systems and versions, as well as the exploitation mechanism.
Vulnerability Description
DataHub Frontend sessions were signed using a SHA-1 HMAC, making it susceptible to brute-force attacks due to shorter key length than recommended. An attacker could gain escalated privileges by cracking the signing key.
Affected Systems and Versions
DataHub versions prior to 0.11.1 are affected by this vulnerability. All deployments using default settings for session signing are at risk.
Exploitation Mechanism
Attackers with access to session tokens can exploit the vulnerability to crack the signing key and generate privileged session cookies, enabling unauthorized access.
Mitigation and Prevention
In response to CVE-2023-47640, immediate steps, long-term security practices, and the importance of patching and updates are highlighted.
Immediate Steps to Take
All users are advised to upgrade to DataHub version 0.11.1 or newer. Deployments should update to the latest helm chart and rotate their session signing secret to mitigate the risk.
Long-Term Security Practices
Regularly review and update cryptographic algorithms, adhere to key length recommendations, and implement secure session signing practices to prevent similar vulnerabilities.
Patching and Updates
Version 0.11.1 of DataHub resolves the vulnerability. It is crucial for all users to apply patches promptly to secure their systems.