EUVD-2023-2840

Comprehensive Technical Analysis of EUVD-2023-2840

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Overview: The vulnerability in the crypto-js library affects the PBKDF2 (Password-Based Key Derivation Function 2) implementation. Prior to version 4.2.0, the library defaults to using SHA1 with a single iteration, which is significantly weaker than the industry standard. This makes it susceptible to preimage and collision attacks, posing a high risk to systems using this library for password protection or signature generation.

Severity Evaluation:

• Base Score: 9.1 (CVSS 3.1)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

The high base score indicates a critical vulnerability. The attack vector (AV:N) is network-based, requiring no privileges (PR:N) or user interaction (UI:N). The impact on confidentiality (C:H) and integrity (I:H) is high, while availability (A:N) is not affected.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Preimage Attacks: An attacker could exploit the weak hash function (SHA1) to find an input that hashes to a given output, potentially compromising passwords.
• Collision Attacks: An attacker could generate two different inputs that produce the same hash, undermining the integrity of digital signatures.
• Brute Force Attacks: The single iteration count makes brute force attacks more feasible, allowing attackers to crack passwords more easily.

Exploitation Methods:

• Password Cracking: Attackers could use the weak PBKDF2 implementation to crack passwords stored using this library.
• Signature Forgery: Attackers could forge digital signatures by exploiting the weak hash function and low iteration count.

3. Affected Systems and Software Versions

Affected Software:

• crypto-js library versions prior to 4.2.0.

Affected Systems:

• Any system or application that uses the crypto-js library for password hashing or digital signature generation.
• This includes web applications, mobile applications, and any other software that relies on crypto-js for cryptographic operations.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to crypto-js version 4.2.0 or later, which includes a patch for this issue.
• Configuration: If upgrading is not immediately possible, configure crypto-js to use SHA256 with at least 250,000 iterations.

Long-Term Mitigation:

• Regular Audits: Conduct regular security audits of cryptographic libraries and configurations.
• Monitoring: Implement monitoring to detect unusual activity that may indicate an exploitation attempt.
• User Education: Educate developers and users about the importance of using strong cryptographic standards and configurations.

5. Impact on European Cybersecurity Landscape

Regulatory Compliance:

• Organizations must ensure compliance with regulations such as GDPR, which mandates strong protection of personal data.
• Non-compliance could result in significant fines and reputational damage.

Industry Standards:

• The vulnerability highlights the importance of adhering to current industry standards for cryptographic operations.
• Organizations should prioritize the use of strong, up-to-date cryptographic algorithms and configurations.

Public Trust:

• Breaches resulting from this vulnerability could erode public trust in digital services, particularly those handling sensitive information.

6. Technical Details for Security Professionals

Technical Overview:

• PBKDF2: A key derivation function that applies a pseudorandom function to the input password along with a salt value and repeats the process many times to produce a derived key.
• SHA1: A cryptographic hash function considered insecure due to vulnerabilities to collision attacks.
• Iteration Count: The number of times the pseudorandom function is applied, increasing the computational effort required for brute force attacks.

References:

• GitHub Advisory: GHSA-xwcq-pm8m-c4vf
• NVD Entry: CVE-2023-46233
• Patch Commit: 421dd538b2d34e7c24a5b72cc64dc2b9167db40a
• Debian Announcement: Debian LTS Announcement

Conclusion: The vulnerability in crypto-js underscores the critical importance of maintaining up-to-date cryptographic standards and configurations. Organizations must act swiftly to mitigate this risk and ensure the security of their systems and data. Regular audits, monitoring, and adherence to best practices are essential for maintaining a robust cybersecurity posture.