CVE-2021-44094 in ZrLog
Summary
by MITRE • 11/29/2021
ZrLog 2.2.2 has a remote command execution vulnerability at plugin download function, it could execute any JAR file
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 12/02/2021
The vulnerability identified as CVE-2021-44094 affects ZrLog version 2.2.2 and represents a critical remote command execution flaw within the plugin download functionality. This vulnerability stems from inadequate input validation and sanitization mechanisms that allow remote attackers to upload and execute arbitrary JAR files on the affected system. The issue manifests when the application processes plugin downloads without proper security controls, creating an avenue for malicious actors to bypass normal execution boundaries and gain unauthorized system access.
The technical exploitation of this vulnerability occurs through the plugin download function which fails to validate or sanitize the JAR file content before processing. Attackers can craft malicious JAR files containing malicious code that gets executed when the application attempts to download and process these plugins. This flaw falls under CWE-434 which specifically addresses the insecure upload of code, where applications accept and execute files from untrusted sources without proper validation. The vulnerability creates a direct path for attackers to execute arbitrary commands on the target system, potentially leading to full system compromise.
From an operational impact perspective, this vulnerability poses significant risks to organizations using ZrLog 2.2.2 as it allows remote attackers to execute commands with the privileges of the application server. The potential consequences include data exfiltration, system compromise, lateral movement within the network, and establishment of persistent backdoors. The vulnerability affects the confidentiality, integrity, and availability of the affected system, making it a critical security concern that requires immediate remediation. Organizations relying on this blogging platform face potential exposure to advanced persistent threats and unauthorized access to their web infrastructure.
The mitigation strategy for CVE-2021-44094 involves immediate patching of the ZrLog application to version 2.2.3 or later, which addresses the insecure plugin download functionality. Organizations should also implement network segmentation and access controls to limit exposure, disable unnecessary plugin functionality, and monitor for suspicious file uploads. Additionally, implementing web application firewalls and intrusion detection systems can help detect and prevent exploitation attempts. This vulnerability aligns with ATT&CK technique T1059 which covers command and scripting interpreter, and T1105 which addresses remote file execution, highlighting the need for comprehensive security controls that address both the immediate vulnerability and broader attack surface management. The remediation process should include thorough security testing to ensure that the patched version properly validates all plugin downloads and implements proper input sanitization to prevent similar issues in the future.