Overview
Today, we will be discussing a critical vulnerability identified as CVE-2019-19144. This flaw is an XML External Entity (XXE) Injection vulnerability that affects Quantum DXi6702 devices running version 2.3.0.3 (11449-53631 Build304). The vulnerability is of particular concern due to its high severity, with a CVSS score of 9.8, signifying that it poses a significant risk to the security of affected systems.
The vulnerability can potentially lead to system compromise or data leakage, making it a serious threat that warrants immediate attention. It is especially concerning for organizations that depend on Quantum DXi6702 devices for their daily operations, as an exploit could lead to significant operational and financial losses.
Vulnerability Summary
CVE ID: CVE-2019-19144
Severity: Critical (CVSS 9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
Quantum DXi6702 | 2.3.0.3 (11449-53631 Build304)
How the Exploit Works
The XML External Entity (XXE) Injection vulnerability in Quantum DXi6702 devices arises from the improper processing of XML data. When the device receives a specially crafted XML request where an external entity is defined with a URI that resolves to a file on the local machine or a resource on the network, it can lead to unauthorized disclosure of file data, denial of service, SSRF, NTLM relay, or remote code execution.
Conceptual Example Code
Below is a conceptual example of an HTTP request exploiting this vulnerability:
POST /rest/Users?action=authenticate HTTP/1.1
Host: target.example.com
Content-Type: application/xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [ <!ELEMENT foo ANY >
<!ENTITY xxe SYSTEM "file:///etc/passwd" >]>
<foo>&xxe;</foo>In this example, the entity `xxe` is defined as the system file `/etc/passwd`. The XML parser resolves the entity and includes the content of the file in its response, leading to information disclosure.
Mitigation Measures
The primary mitigation measure for this vulnerability is applying the vendor-provided patch. Quantum has released a patch that addresses this vulnerability, and users are strongly advised to apply this patch as soon as possible to protect their systems.
In situations where immediate patching is not possible, temporary mitigation can be achieved by using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS). Both of these security measures can help detect and prevent attempts to exploit this vulnerability. However, these are temporary solutions, and applying the vendor-provided patch remains the most effective way to mitigate this vulnerability.