Cisco Secure Firewall Management Center Software HTML Injection Vulnerability

TL;DR 📌

A high-severity HTML injection vulnerability has been identified in the Cisco Secure Firewall Management Center (FMC) Software. This flaw allows authenticated remote attackers to inject arbitrary HTML content into device-generated documents, potentially leading to sensitive information exposure. Cisco has released updates to address this issue, but there are no workarounds available.

What happened 🕵️‍♂️

A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center Software could allow an authenticated, remote attacker to inject arbitrary HTML content into a device-generated document. This vulnerability arises from improper validation of user-supplied data. An attacker with valid credentials (at least Security Analyst role) could exploit this vulnerability to alter document layouts, read arbitrary files from the underlying operating system, and conduct server-side request forgery (SSRF) attacks.

Affected products 🖥️

The vulnerability affects the Cisco Secure FMC Software, regardless of device configuration. Other products, such as Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software, are confirmed not to be vulnerable.

Fixed software 🔧

Upgrade to the first fixed release in your train (or later):

Workarounds 🧯

There are no workarounds that address this vulnerability.

Risk in context 🎯

The vulnerability has a CVSS score of 8.5, indicating a high severity risk. Exploitation requires valid user credentials, but successful attacks could lead to significant data exposure and manipulation. Given the nature of the vulnerability, it is crucial for affected organizations to prioritize patching.

Fast facts ⚡

• Vulnerability: HTML Injection
• CVSS Score: 8.5 (High)
• Exploitation: Requires valid credentials
• Impact: Potential data exposure and manipulation
• Workarounds: None available

For leadership 🧭

This vulnerability poses a High risk to the organization due to its CVSS score of 8.5. It requires valid credentials for exploitation, but successful attacks could lead to unauthorized access to sensitive information and document manipulation. Immediate remediation is necessary; organizations should patch within 7 days to mitigate risks.

• Operational Impact: Brief maintenance window, no configuration drift expected.
• Clear Now / Next / Later:
  • Now: Review affected systems and ensure all users have the necessary credentials.
  • Next: Apply the available software updates as soon as possible.
  • Later: Monitor for any signs of exploitation and reassess security policies related to user access.