Source: cna@vuldb.com
A flaw has been found in HummerRisk up to 1.5.0. This vulnerability affects the function fixedCommand of the file hummer-common/hummer-common-core/src/main/java/com/hummer/common/core/utils/PlatformUtils.java of the component Cloud Compliance Scanning. Executing a manipulation can lead to command injection. The attack can be executed remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
HummerRisk up to version 1.5.0 is vulnerable to a critical command injection flaw, allowing remote attackers to execute arbitrary commands on the server. This vulnerability, located within the fixedCommand function of PlatformUtils.java, poses a significant risk of system compromise and data exfiltration due to the lack of input validation.
Step 1: Payload Delivery: An attacker crafts a malicious payload containing shell commands designed to be injected into the fixedCommand function. This payload is likely delivered via a network request, potentially through a web interface or API call.
Step 2: Input Processing: The vulnerable fixedCommand function receives the attacker-controlled input. The input is likely used to construct a command string.
Step 3: Command Construction: The function concatenates the attacker-supplied input with other parameters to form a complete shell command. Due to the lack of input validation, the attacker's injected commands are included in the command string.
Step 4: Command Execution: The constructed command string is executed by the operating system, typically using a function like Runtime.getRuntime().exec() or similar. The injected commands are then executed by the operating system.
Step 5: System Compromise: The attacker's injected commands are executed, allowing them to perform actions such as data exfiltration, privilege escalation, or system control.
The vulnerability stems from insufficient input sanitization within the fixedCommand function of PlatformUtils.java. This function likely constructs and executes shell commands based on user-supplied input. The absence of proper validation or escaping of user-controlled parameters allows an attacker to inject malicious commands into the command string. When the command is executed by the operating system, the injected commands are also executed, leading to arbitrary code execution. The root cause is a failure to properly sanitize user input before passing it to a system command execution function, creating a command injection vulnerability.
While no specific APT groups are explicitly linked to this CVE, the ease of exploitation and the lack of vendor response make it a prime target for opportunistic attackers and potentially state-sponsored actors. The vulnerability's potential for remote code execution makes it attractive for various malicious activities, including ransomware deployment and data theft. This CVE is likely to be added to CISA's Known Exploited Vulnerabilities (KEV) catalog soon.
Monitor network traffic for suspicious HTTP requests or API calls containing command injection payloads (e.g., shell metacharacters like ';', '&', '|', '$', '`').
Analyze server-side logs for unusual command executions, especially those originating from external sources or unexpected user agents.
Implement intrusion detection system (IDS) rules to detect known command injection patterns and exploit attempts.
Monitor file system activity for suspicious file creations or modifications, particularly in system directories.
Examine process execution logs for processes spawned with unusual command-line arguments.
Upgrade to HummerRisk version 1.5.1 or later (if available) to patch the vulnerability. If no patch is available, contact the vendor for a patch or workaround.
Implement robust input validation and sanitization within the fixedCommand function. This includes escaping special characters, whitelisting allowed characters, and validating the format and content of user-supplied input.
Avoid using system command execution functions (e.g., Runtime.getRuntime().exec()) if possible. If unavoidable, use safer alternatives or libraries that handle command execution securely.
Implement a Web Application Firewall (WAF) to filter malicious requests and block command injection attempts.
Enforce the principle of least privilege, restricting the permissions of the user account running the HummerRisk application.
Regularly scan the system for vulnerabilities and apply security patches promptly.
Conduct penetration testing to identify and address command injection vulnerabilities.