EUVD-2023-33676

Comprehensive Technical Analysis of EUVD-2023-33676

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2023-33676 affects Code Dx versions prior to 2023.4.2. This vulnerability allows a malicious actor to perform a user impersonation attack by crafting a custom "Remember Me" token. The use of a hard-coded cipher in generating this token facilitates the attack.

Severity Evaluation:

• CVSS Base Score: 9.8 (CVSS:3.1)
• CVSS Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The high base score of 9.8 indicates a critical vulnerability. The attack vector (AV:N) is network-based, requiring no user interaction (UI:N) and no privileges (PR:N). The attack complexity is low (AC:L), and the impact on confidentiality and integrity is high (C:H/I:H), while the availability impact is high (A:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attack: The attacker can exploit the vulnerability remotely over the network.
• Token Crafting: The attacker crafts a custom "Remember Me" token using the hard-coded cipher.
• Username Knowledge: The attacker needs to know the username of the target user to impersonate them.

Exploitation Methods:

1. Token Generation: The attacker generates a custom "Remember Me" token using the known hard-coded cipher.
2. Token Submission: The attacker submits the crafted token to the Code Dx system.
3. User Impersonation: The attacker gains access to the target user's account, effectively impersonating them.

3. Affected Systems and Software Versions

Affected Software:

• Code Dx: All versions prior to 2023.4.2

Vendor:

• Synopsys

Product:

• Code Dx

Versions:

• 0 ≤ 2023.4.1

4. Recommended Mitigation Strategies

Immediate Actions:

1. Upgrade Software: Upgrade to Code Dx version 2023.4.2 or later, which addresses the vulnerability.
2. Disable "Remember Me" Feature: Temporarily disable the "Remember Me" feature until the upgrade is complete.
3. Monitor for Suspicious Activity: Implement monitoring to detect and respond to any suspicious login attempts or user impersonation activities.

Long-Term Mitigations:

1. Regular Patch Management: Ensure that all software, including Code Dx, is regularly updated and patched.
2. Token Security: Implement stronger token generation mechanisms that do not rely on hard-coded ciphers.
3. User Education: Educate users about the risks of user impersonation and the importance of reporting any suspicious activity.

5. Impact on European Cybersecurity Landscape

The vulnerability in Code Dx poses a significant risk to organizations using the software, particularly those in the European Union. The ability to impersonate users can lead to unauthorized access to sensitive information, data breaches, and potential compliance violations under regulations such as GDPR. The high severity of this vulnerability underscores the need for robust cybersecurity practices and timely patch management.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2023-2158
• GSD ID: GSD-2023-2158
• Assigner: SNPS

Technical Insights:

• Hard-Coded Cipher: The vulnerability stems from the use of a hard-coded cipher in the generation of "Remember Me" tokens. This cipher can be reverse-engineered by an attacker to craft valid tokens.
• Token Structure: The token structure likely includes a combination of user-specific data and a timestamp, encrypted using the hard-coded cipher.
• Exploitation Steps:
  1. Identify Target Username: The attacker identifies the username of the target user.
  2. Craft Token: The attacker crafts a "Remember Me" token using the known cipher and the target username.
  3. Submit Token: The attacker submits the crafted token to the Code Dx system, gaining access to the target user's account.

Detection and Response:

• Log Analysis: Analyze login logs for unusual patterns or multiple failed login attempts followed by successful logins.
• Anomaly Detection: Implement anomaly detection systems to identify and alert on suspicious login activities.
• Incident Response: Develop and maintain an incident response plan to quickly address and mitigate any detected impersonation attempts.

References:

• Synopsys Community Announcement

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of user impersonation and protect their sensitive data.