CVE-2019-1933 : Security Advisory and Response
Learn about CVE-2019-1933, a vulnerability in Cisco Email Security Appliance allowing attackers to bypass filters and inject malicious code. Find mitigation steps and patching details.
Cisco Email Security Appliance Content Filter Bypass Vulnerability
Understanding CVE-2019-1933
A security flaw in the email message scanning feature of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) allows attackers to bypass configured filters on the device.
What is CVE-2019-1933?
The vulnerability arises from improper validation of certain email fields, enabling unauthenticated attackers to send crafted emails to recipients protected by ESA, bypassing filters, and injecting malicious code.
The Impact of CVE-2019-1933
- CVSS Base Score: 5.8 (Medium Severity)
- Attack Vector: Network
- Attack Complexity: Low
- Integrity Impact: Low
- Successful exploitation could allow attackers to inject arbitrary scripting code into email bodies.
Technical Details of CVE-2019-1933
Affects Cisco Email Security Appliance (ESA) version 11.1.2-023
Vulnerability Description
- Flaw in email message scanning
- Allows unauthenticated attackers to bypass configured filters
Affected Systems and Versions
- Product: Cisco Email Security Appliance (ESA)
- Vendor: Cisco
- Version: 11.1.2-023
Exploitation Mechanism
- Attackers send specially crafted emails to protected recipients
- Malicious code injection into email body
Mitigation and Prevention
Immediate Steps to Take:
- Apply vendor-provided patches
- Monitor email client settings to restrict script execution
Long-Term Security Practices:
- Regularly update security configurations
- Conduct security awareness training for email users
Patching and Updates:
- Refer to Cisco's security advisory for patch availability and installation instructions