CVE-2024-32755: Web Interface Input Validation Vulnerability

CVE-2024-32755 Overview

CVE-2024-32755 is an improper input validation vulnerability [CWE-20] affecting a vendor web interface. Under certain circumstances, the web interface accepts characters unrelated to the expected input, allowing authenticated attackers to influence application behavior in unintended ways. The flaw was disclosed through CISA ICS Advisory ICSA-24-179-04 and the corresponding Johnson Controls Security Advisory. The vulnerability is network-exploitable, requires high privileges, and impacts confidentiality, integrity, and availability across a changed security scope.

Critical Impact

An authenticated attacker can submit unexpected characters to the web interface, compromising confidentiality, integrity, and availability across the affected system boundary.

Affected Products

• Refer to CISA ICS Advisory ICSA-24-179-04 for the affected product list
• Vendor-identified components documented in the Johnson Controls Security Advisory
• Specific CPE entries are not enumerated in the NVD record at this time

Discovery Timeline

• 2024-07-02 - CVE-2024-32755 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2024-32755

Vulnerability Analysis

The vulnerability is classified as Improper Input Validation [CWE-20]. The web interface fails to enforce strict input filtering, accepting characters that fall outside the expected character set for given fields. This mishandling occurs under specific conditions described by the vendor advisory.

Because the issue affects a scope-changing component, exploitation can influence resources beyond the immediate web interface. An authenticated attacker with high privileges can leverage the loose validation to manipulate downstream parsing, command construction, or stored configuration values.

The Exploit Prediction Scoring System (EPSS) currently lists this CVE at 0.129% probability, and no public proof-of-concept has been published. The CVE is not present on the CISA Known Exploited Vulnerabilities catalog.

Root Cause

The root cause is missing or insufficient character whitelisting on inputs received by the web interface. Input fields accept characters outside the documented allowed set, bypassing validation routines that should reject malformed data before it reaches handlers responsible for confidentiality-, integrity-, or availability-sensitive operations.

Attack Vector

The attack vector is network-based. An authenticated user with elevated privileges sends crafted HTTP requests containing characters unrelated to the expected input. The malformed input is accepted, processed, and may alter program flow in components beyond the original security scope. No verified exploit code is publicly available; refer to the vendor advisory for technical specifics.

Detection Methods for CVE-2024-32755

Indicators of Compromise

• Unexpected characters or control sequences observed in web interface request logs, particularly in fields that normally accept alphanumeric input
• Configuration changes or administrative actions originating from authenticated sessions outside expected operator workflows
• Anomalous HTTP POST or PUT requests targeting management endpoints of the affected product

Detection Strategies

• Inspect web server access logs for non-printable, multi-byte, or shell metacharacter input submitted to administrative forms
• Correlate authenticated session activity with configuration or state changes to identify abuse of privileged accounts
• Apply intrusion detection signatures that flag malformed parameters sent to known management URIs referenced in CISA ICS Advisory ICSA-24-179-04

Monitoring Recommendations

• Forward web interface and authentication logs to a centralized SIEM for retention and correlation
• Alert on repeated input validation errors or rejected requests from privileged accounts, which may indicate exploitation attempts
• Monitor for new or modified administrative accounts on affected devices following any suspicious request pattern

How to Mitigate CVE-2024-32755

Immediate Actions Required

• Apply the vendor-supplied patch documented in the Johnson Controls Security Advisory as soon as practical
• Restrict network access to the web interface so that only trusted management hosts can reach it
• Audit existing privileged accounts and rotate credentials for any account capable of authenticating to the affected interface

Patch Information

Vendor remediation guidance is provided in the Johnson Controls Security Advisory and summarized by CISA ICS Advisory ICSA-24-179-04. Operators should review the advisories to determine the fixed firmware or software version applicable to their deployment.

Workarounds

• Place the affected web interface behind a VPN or jump host and block direct exposure to untrusted networks
• Enforce network segmentation between operational technology assets and general-purpose corporate networks
• Limit privileged account assignment to the minimum number of operators required for administration

# Configuration example
# Refer to vendor advisory for product-specific hardening commands