CVE-2020-3134 : Exploit Details and Defense Strategies
Learn about CVE-2020-3134, a vulnerability in Cisco Email Security Appliance (ESA) allowing remote attackers to trigger a denial of service condition by exploiting zip file validation.
A vulnerability in the zip decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
Understanding CVE-2020-3134
This CVE involves a vulnerability in the zip decompression engine of Cisco Email Security Appliance (ESA) that could lead to a denial of service (DoS) attack.
What is CVE-2020-3134?
The vulnerability in the zip decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) allows a remote attacker to trigger a DoS condition by exploiting improper validation of zip files.
The Impact of CVE-2020-3134
- CVSS Base Score: 6.5 (Medium Severity)
- Attack Vector: Network
- Attack Complexity: Low
- Availability Impact: Low
- Integrity Impact: Low
- This vulnerability could result in a temporary DoS condition by restarting the content-scanning process.
Technical Details of CVE-2020-3134
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability is caused by improper validation of zip files in Cisco AsyncOS Software for Cisco ESA, allowing attackers to exploit it by sending a crafted zip-compressed attachment.
Affected Systems and Versions
- Affected Product: Cisco Email Security Appliance (ESA)
- Vendor: Cisco
- Affected Versions: Earlier than 13.0
Exploitation Mechanism
Attackers can exploit this vulnerability by sending an email with a malicious zip-compressed attachment, triggering a restart of the content-scanning process.
Mitigation and Prevention
Protecting systems from CVE-2020-3134 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply vendor-provided patches or updates promptly.
- Implement email filtering to block suspicious attachments.
- Monitor network traffic for any unusual patterns.
Long-Term Security Practices
- Regularly update and patch software to mitigate known vulnerabilities.
- Conduct security awareness training to educate users on identifying phishing emails.
Patching and Updates
- Cisco has released patches to address this vulnerability. Ensure all affected systems are updated to versions 13.0 or later.