CVE-2019-15971 Explained : Impact and Mitigation
Learn about CVE-2019-15971, a vulnerability in Cisco Email Security Appliance (ESA) allowing remote attackers to bypass content filters via MP3 files. Find mitigation steps and patching advice here.
A vulnerability in the MP3 detection mechanism of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) allows a remote attacker to bypass content filters without authentication.
Understanding CVE-2019-15971
This CVE describes a flaw in the MP3 detection engine of Cisco Email Security Appliance (ESA) that could be exploited by an attacker to bypass content filters on the device.
What is CVE-2019-15971?
The vulnerability arises from inadequate validation of specific types of MP3 files, enabling an attacker to send a crafted MP3 file through the device to bypass content filters.
The Impact of CVE-2019-15971
If successfully exploited, the vulnerability allows an attacker to bypass content filters that would typically discard the email, potentially leading to malicious content delivery.
Technical Details of CVE-2019-15971
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The flaw in the MP3 detection engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) results from improper validation of certain MP3 file types.
Affected Systems and Versions
- Product: Cisco Email Security Appliance (ESA)
- Vendor: Cisco
- Versions: Unspecified
Exploitation Mechanism
- Attack Complexity: Low
- Attack Vector: Network
- Base Score: 5.8 (Medium)
- Privileges Required: None
- User Interaction: None
- Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Mitigation and Prevention
Protecting systems from CVE-2019-15971 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply vendor patches and updates promptly.
- Monitor network traffic for any suspicious activity related to MP3 files.
Long-Term Security Practices
- Regularly update and patch all software and firmware.
- Implement strong email filtering and content inspection mechanisms.
Patching and Updates
- Cisco has likely released patches to address this vulnerability. Ensure all relevant updates are applied to mitigate the risk of exploitation.