CVE-2020-15094 : Exploit Details and Defense Strategies
Learn about CVE-2020-15094, a remote code execution vulnerability in Symfony versions before 4.4.13 and 5.1.5. Understand the impact, affected systems, exploitation mechanism, and mitigation steps.
In Symfony before versions 4.4.13 and 5.1.5, a vulnerability exists in the CachingHttpClient class from the HttpClient Symfony component, allowing for remote code execution.
Understanding CVE-2020-15094
What is CVE-2020-15094?
In Symfony versions prior to 4.4.13 and 5.1.5, the CachingHttpClient class is susceptible to a remote code execution vulnerability due to improper handling of cached responses.
The Impact of CVE-2020-15094
The vulnerability allows an attacker to execute remote code by manipulating responses controlled by the CachingHttpClient class.
Technical Details of CVE-2020-15094
Vulnerability Description
The issue arises from the reliance of the CachingHttpClient class on the HttpCache class, which uses internal headers to manage cached responses, leading to potential code execution.
Affected Systems and Versions
- Symfony versions >= 4.4.0, < 4.4.13
- Symfony versions >= 5.0.0, < 5.1.5
Exploitation Mechanism
- Attack Complexity: High
- Attack Vector: Network
- Privileges Required: Low
- User Interaction: Required
- Scope: Changed
- Confidentiality, Integrity, and Availability Impact: High
Mitigation and Prevention
Immediate Steps to Take
- Update Symfony to versions 4.4.13 or 5.1.5 to mitigate the vulnerability.
- Monitor for any unauthorized access or suspicious activities.
Long-Term Security Practices
- Regularly update software components and libraries to patch known vulnerabilities.
- Implement secure coding practices to prevent similar issues in the future.
Patching and Updates
- Apply patches provided by Symfony to address the vulnerability.