HCL — CraftedSignal Threat Feed

HCL BigFix WebUI Information Disclosure Vulnerabilities

hello@craftedsignal.io — Mon, 11 May 2026 10:42:58 +0000

Multiple information disclosure vulnerabilities exist within the HCL BigFix WebUI applications. An authenticated, remote attacker can exploit these vulnerabilities to gain unauthorized access to sensitive information. The vulnerabilities stem from inadequate access controls and insufficient sanitization of user-supplied inputs. Successful exploitation could lead to exposure of confidential data, potentially impacting the integrity and confidentiality of the affected system. The scope of impact is limited to organizations utilizing vulnerable versions of HCL BigFix WebUI.

Attack Chain

An attacker gains valid credentials to the HCL BigFix WebUI through compromised accounts or credential harvesting.
The attacker authenticates to the HCL BigFix WebUI with the acquired credentials.
The attacker crafts a malicious HTTP request targeting a vulnerable endpoint within the WebUI.
The malicious request exploits insufficient access controls to access unauthorized data.
The attacker may also exploit insufficient sanitization of user-supplied inputs, leading to information disclosure.
The WebUI processes the request and inadvertently exposes sensitive information in the response.
The attacker parses the response and extracts the disclosed information.
The attacker uses the disclosed information for further malicious activities, such as lateral movement or privilege escalation.

Impact

Successful exploitation of these vulnerabilities could lead to the disclosure of sensitive information, such as user credentials, configuration details, or internal network information. This information could be leveraged by an attacker to further compromise the affected system or network. The number of affected organizations is currently unknown, but the impact on each organization could be significant, depending on the sensitivity of the disclosed information.

Recommendation

Deploy the Sigma rules provided in this brief to detect potential exploitation attempts within your environment.
Review and enforce strong authentication and authorization mechanisms for the HCL BigFix WebUI.
Conduct regular security assessments and penetration testing of the HCL BigFix WebUI to identify and remediate potential vulnerabilities.

Multiple Vulnerabilities in HCL BigFix

hello@craftedsignal.io — Mon, 11 May 2026 09:04:04 +0000

HCL BigFix is susceptible to multiple vulnerabilities that, if exploited, could lead to significant security compromises. An attacker could leverage these vulnerabilities to achieve a range of malicious activities, including unauthorized information disclosure, arbitrary code execution, denial-of-service (DoS) attacks, and the manipulation of critical system files. Defenders should prioritize detection and mitigation measures to prevent potential exploitation.

Attack Chain

Attacker identifies a vulnerable endpoint running HCL BigFix.
The attacker exploits a vulnerability to gain initial access. This may involve sending a specially crafted request to the BigFix server.
Using the initial foothold, the attacker attempts to escalate privileges on the system.
The attacker leverages code execution vulnerability to deploy a malicious payload on the targeted system.
The deployed payload establishes a command and control (C2) channel with the attacker’s infrastructure.
The attacker uses the C2 channel to exfiltrate sensitive information from the compromised system.
The attacker exploits another vulnerability to manipulate files, potentially altering configurations or injecting malicious code into legitimate applications.
The attacker initiates a denial-of-service attack, disrupting the availability of the BigFix service and impacting managed endpoints.

Impact

Successful exploitation of these vulnerabilities could result in significant data breaches, system compromise, and operational disruption. The ability to execute arbitrary code allows attackers to install malware, steal sensitive data, or pivot to other systems on the network. Manipulation of files could lead to data corruption or system instability. A denial-of-service attack could disrupt critical IT operations managed by BigFix.

Recommendation

Investigate and patch HCL BigFix deployments with the latest security updates from the vendor to remediate the vulnerabilities.
Implement network segmentation to limit the blast radius of potential compromises.
Deploy the Sigma rules in this brief to your SIEM to detect potential exploitation attempts.
Enable process monitoring to detect suspicious process execution originating from BigFix processes (see process_creation log source).