CVE-2020-3405 : What You Need to Know

A vulnerability in the web UI of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to gain unauthorized access to sensitive information stored on the affected system.

Understanding CVE-2020-3405

This CVE involves a security flaw in Cisco SD-WAN vManage Software that could be exploited by attackers to read and write files within the application.

What is CVE-2020-3405?

The vulnerability arises from improper handling of XML External Entity (XXE) entries when parsing specific XML files. An attacker can exploit this by tricking a user into importing a maliciously crafted XML file.

The Impact of CVE-2020-3405

If successfully exploited, the vulnerability could enable the attacker to access and modify files within the affected application, potentially leading to unauthorized data disclosure or manipulation.

Technical Details of CVE-2020-3405

The following technical details provide insight into the vulnerability and its implications:

Vulnerability Description

The vulnerability in Cisco SD-WAN vManage Software allows remote attackers to gain unauthorized read and write access to stored information by exploiting XXE entries in XML files.

Affected Systems and Versions

Product: Cisco SD-WAN vManage
Vendor: Cisco
Affected Version: n/a

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Confidentiality Impact: High
Privileges Required: Low
User Interaction: None
Vector String: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are crucial to mitigating the risks associated with CVE-2020-3405.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Monitor network traffic for any suspicious activity.
Educate users about the risks of importing files from untrusted sources.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Implement access controls and user permissions to limit unauthorized access.
Conduct security training and awareness programs for employees.

Patching and Updates

Cisco may release security advisories or patches to address the vulnerability. Stay informed about updates and apply them as soon as they are available.