CVE-2018-0447 : Vulnerability Insights and Analysis
Learn about CVE-2018-0447, a vulnerability in Cisco Email Security Appliance (ESA) allowing attackers to bypass content filters and potentially pass malicious URLs through the device. Find mitigation steps here.
A vulnerability in the anti-spam protection mechanisms of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) allows remote attackers to bypass content filters, potentially leading to the passage of malicious URLs through the device.
Understanding CVE-2018-0447
This CVE involves a weakness in the anti-spam safeguard systems of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA), enabling attackers to evade specific content filters on affected devices.
What is CVE-2018-0447?
The vulnerability arises from inadequate input and validation checks for certain Sender Policy Framework (SPF) messages, allowing attackers to send tailored SPF packets to bypass URL filters on the device.
The Impact of CVE-2018-0447
The CVSS base score for this vulnerability is 5.3 (Medium), indicating the potential for attackers to exploit the flaw and circumvent URL filters on impacted devices.
Technical Details of CVE-2018-0447
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The flaw in Cisco Email Security Appliance (ESA) allows remote attackers to bypass content filters by sending customized SPF packets, potentially permitting the passage of malicious URLs through the device.
Affected Systems and Versions
- Product: Cisco Email Security Appliance (ESA)
- Vendor: Cisco
- Version: Not applicable
Exploitation Mechanism
Attackers exploit the vulnerability by sending tailored SPF packets to the affected device, enabling them to circumvent URL filters and allow malicious URLs to pass through.
Mitigation and Prevention
Protecting systems from CVE-2018-0447 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply vendor-provided patches and updates promptly.
- Monitor network traffic for any suspicious activities.
- Implement strong email security measures to prevent malicious emails.
Long-Term Security Practices
- Regularly update and patch all software and systems.
- Conduct security training for employees to recognize and report phishing attempts.
Patching and Updates
- Cisco has released patches to address the vulnerability. Ensure timely installation of these patches to mitigate the risk of exploitation.