CVE-2018-5241 Explained : Impact and Mitigation
Learn about CVE-2018-5241 affecting Symantec ASG & ProxySG versions 6.5-6.7. Discover the impact, technical details, and mitigation steps for this SAML authentication bypass vulnerability.
Symantec Advanced Secure Gateway (ASG) and ProxySG versions 6.5, 6.6, and 6.7 are affected by a SAML authentication bypass vulnerability that allows remote attackers to manipulate valid SAML responses, potentially compromising user authentication security controls.
Understanding CVE-2018-5241
This CVE involves a critical vulnerability in Symantec products that impacts the authentication process for network users in intercepted proxy traffic.
What is CVE-2018-5241?
The vulnerability arises from the mishandling of XML nodes with comments in SAML responses by ASG and ProxySG, enabling attackers to modify authentic SAML responses without invalidating their cryptographic signatures.
The Impact of CVE-2018-5241
- Remote attackers can exploit this flaw to bypass user authentication security controls implemented in ASG and ProxySG.
- The vulnerability specifically affects the authentication of network users in intercepted traffic and does not impact administrator user authentication for the management consoles.
Technical Details of CVE-2018-5241
Symantec ASG and ProxySG versions 6.5, 6.6, and 6.7 are susceptible to this authentication bypass vulnerability.
Vulnerability Description
- The flaw allows remote attackers to modify valid SAML responses without invalidating their cryptographic signatures.
Affected Systems and Versions
- Symantec Advanced Secure Gateway (ASG) versions 6.6 and 6.7
- ProxySG versions 6.5, 6.6, and 6.7
Exploitation Mechanism
- Attackers can exploit the vulnerability by manipulating XML nodes with comments in SAML responses.
Mitigation and Prevention
To address CVE-2018-5241, follow these steps:
Immediate Steps to Take
- Apply patches provided by Symantec to fix the vulnerability.
- Monitor Symantec's security advisories for updates and recommendations.
Long-Term Security Practices
- Regularly update and patch Symantec products to mitigate potential security risks.
Patching and Updates
- Stay informed about security updates and apply them promptly to ensure system security.