CVE-2020-27197 : Vulnerability Insights and Analysis

TAXII libtaxii through 1.1.117, as used in EclecticIQ OpenTAXII through 0.2.0 and other products, allows SSRF via an initial http:// substring to the parse method, even when the no_network setting is used for the XML parser. The vendor notes that the parse method wraps the lxml library, potentially raising concerns to the lxml group.

Understanding CVE-2020-27197

This CVE involves a vulnerability in TAXII libtaxii that can be exploited for SSRF attacks.

What is CVE-2020-27197?

CVE-2020-27197 is a security vulnerability in TAXII libtaxii that enables SSRF attacks through the parse method, even when no_network setting is applied to the XML parser.

The Impact of CVE-2020-27197

The vulnerability allows malicious actors to perform Server-Side Request Forgery (SSRF) attacks, potentially leading to unauthorized access to internal systems or sensitive data.

Technical Details of CVE-2020-27197

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability in TAXII libtaxii through version 1.1.117 allows SSRF via an initial http:// substring to the parse method, bypassing the no_network setting for the XML parser.

Affected Systems and Versions

TAXII libtaxii through version 1.1.117
EclecticIQ OpenTAXII through version 0.2.0

Exploitation Mechanism

Malicious actors can exploit this vulnerability by inserting an initial http:// substring to the parse method, even when the no_network setting is enforced for the XML parser.

Mitigation and Prevention

Protecting systems from CVE-2020-27197 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly to mitigate the vulnerability.
Monitor network traffic for any suspicious SSRF activities.
Implement strict input validation to prevent SSRF attacks.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate SSRF vulnerabilities.

Patching and Updates

Stay informed about security advisories from the vendor and apply patches as soon as they are available.