Description
Out-of-bounds read in Application Gateway allows an unauthorized attacker to elevate privileges over a network.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-199684
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2025-199684 is an out-of-bounds read in the Application Gateway, which allows an unauthorized attacker to elevate privileges over a network. The CVSS (Common Vulnerability Scoring System) base score of 9.4 indicates a critical severity level. The CVSS vector breakdown is as follows:
- AV:N (Network Vector): The vulnerability is exploitable over the network.
- AC:L (Low Complexity): The attack requires low skill or resources to exploit.
- PR:N (No Privileges Required): No prior authentication is needed to exploit the vulnerability.
- UI:N (No User Interaction): No user interaction is required for the attack to succeed.
- S:U (Unchanged Scope): The vulnerability does not change the security scope.
- C:H (High Confidentiality Impact): There is a high impact on the confidentiality of the system.
- I:H (High Integrity Impact): There is a high impact on the integrity of the system.
- A:L (Low Availability Impact): There is a low impact on the availability of the system.
- E:U (Unchanged Exploit Code Maturity): The exploit code is not widely available.
- RL:O (Official Fix): An official fix is available.
- RC:C (Confirmed): The vulnerability has been confirmed by the vendor.
Given the high confidentiality and integrity impact, this vulnerability poses a significant risk to affected systems.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector for this vulnerability is network-based, meaning an attacker can exploit it remotely without needing physical access or user interaction. Potential exploitation methods include:
- Network Scanning: Attackers may scan for vulnerable Application Gateways exposed to the internet.
- Crafted Packets: Sending specially crafted network packets to trigger the out-of-bounds read.
- Privilege Escalation: Once the out-of-bounds read is triggered, attackers can elevate their privileges, potentially gaining administrative access.
3. Affected Systems and Software Versions
The vulnerability affects Microsoft's Azure App Gateway. Specific software versions are not listed, indicating that all versions may be vulnerable until patched. Organizations using Azure App Gateway should assume they are at risk until they apply the necessary updates.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following strategies are recommended:
- Apply Patches: Immediately apply the official patch provided by Microsoft.
- Network Segmentation: Isolate the Application Gateway from other critical systems to limit lateral movement.
- Access Controls: Implement strict access controls and monitor for unauthorized access attempts.
- Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious network activity.
- Regular Audits: Conduct regular security audits and vulnerability assessments.
5. Impact on European Cybersecurity Landscape
The impact of this vulnerability on the European cybersecurity landscape is significant due to the widespread use of Azure services in both public and private sectors. Organizations relying on Azure App Gateway for critical operations are at risk of data breaches, unauthorized access, and potential service disruptions. The high severity score underscores the need for immediate action to protect sensitive data and maintain operational integrity.
6. Technical Details for Security Professionals
Out-of-Bounds Read: This type of vulnerability occurs when a program reads data from outside the bounds of allocated memory. In this case, the Application Gateway reads from an unintended memory location, which can be exploited to gain unauthorized access or elevate privileges.
Detection and Response:
- Log Analysis: Monitor logs for unusual read operations or access patterns.
- Behavioral Analysis: Use behavioral analysis tools to detect anomalous behavior indicative of an out-of-bounds read.
- Patch Management: Ensure a robust patch management process to quickly apply updates.
Incident Response:
- Containment: Isolate affected systems to prevent further exploitation.
- Eradication: Apply patches and verify that the vulnerability is mitigated.
- Recovery: Restore systems to a secure state and monitor for any residual effects.
References:
By following these recommendations and staying vigilant, organizations can effectively mitigate the risks associated with EUVD-2025-199684 and protect their systems from potential exploitation.