EUVD-2024-2932

Comprehensive Technical Analysis of EUVD-2024-2932

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in YesWiki, a PHP-based wiki system, involves the use of a weak cryptographic algorithm and a hard-coded salt for hashing the password reset key. This flaw allows an attacker to recover the password reset key and subsequently reset the password of any account.

Severity Evaluation: The vulnerability has a CVSS Base Score of 9.9, which is considered critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L indicates the following:

• Attack Vector (AV:N): The vulnerability can be exploited over the network.
• Attack Complexity (AC:L): The attack requires low complexity.
• Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
• User Interaction (UI:N): No user interaction is required.
• Scope (S:C): The vulnerability affects a changed scope.
• Confidentiality (C:H): The vulnerability has a high impact on confidentiality.
• Integrity (I:L): The vulnerability has a low impact on integrity.
• Availability (A:L): The vulnerability has a low impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attack: An attacker can exploit this vulnerability remotely over the network without needing physical access to the system.
• Password Reset Mechanism: The primary attack vector involves intercepting or guessing the password reset key due to the weak cryptographic algorithm and hard-coded salt.

Exploitation Methods:

• Brute Force Attack: An attacker could use brute force techniques to guess the password reset key.
• Rainbow Table Attack: Given the use of a hard-coded salt, precomputed rainbow tables could be used to quickly determine the reset key.
• Man-in-the-Middle (MitM) Attack: An attacker could intercept the password reset key during transmission if the communication is not properly secured.

3. Affected Systems and Software Versions

Affected Systems:

• YesWiki versions prior to 4.4.5.

Software Versions:

• All versions of YesWiki before 4.4.5 are vulnerable.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade to the Latest Version: Upgrade YesWiki to version 4.4.5 or later, which includes the fix for this vulnerability.
• Disable Password Reset Functionality: Temporarily disable the password reset functionality until the system can be updated.

Long-Term Mitigation:

• Implement Strong Cryptographic Algorithms: Ensure that all cryptographic operations use strong, up-to-date algorithms.
• Use Unique Salts: Avoid hard-coding salts and use unique, random salts for each hashing operation.
• Regular Security Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Data Breach Risk: The vulnerability poses a significant risk of data breaches, as attackers can reset passwords and gain unauthorized access to user accounts.
• Reputation Damage: Organizations using YesWiki could suffer reputational damage if user data is compromised.
• Compliance Issues: Failure to address this vulnerability could result in non-compliance with data protection regulations such as GDPR.

Regulatory Considerations:

• GDPR Compliance: Organizations must ensure that they comply with GDPR by protecting user data and promptly addressing vulnerabilities.
• Incident Reporting: In case of a breach, organizations must report the incident to relevant authorities and affected users within the stipulated timeframe.

6. Technical Details for Security Professionals

Technical Overview:

• Weak Cryptographic Algorithm: The vulnerability arises from the use of a weak cryptographic algorithm for hashing the password reset key.
• Hard-Coded Salt: The use of a hard-coded salt makes it easier for attackers to precompute hashes and recover the reset key.

Mitigation Steps:

1. Update YesWiki: Ensure that all instances of YesWiki are updated to version 4.4.5 or later.
2. Review Cryptographic Practices: Conduct a thorough review of all cryptographic practices within the organization to ensure the use of strong algorithms and unique salts.
3. Monitor for Suspicious Activity: Implement monitoring to detect any suspicious activity related to password resets and account access.
4. User Education: Educate users about the importance of strong passwords and the risks associated with password reset mechanisms.

References:

• GitHub Security Advisory
• NVD Detail
• YesWiki GitHub Repository

By addressing this vulnerability promptly and comprehensively, organizations can mitigate the risk of unauthorized access and data breaches, thereby maintaining the integrity and security of their systems.