CVE-2020-7830 in RAON KUpload
Summary
by MITRE
RAONWIZ v2018.0.2.50 and earlier versions contains a vulnerability that could allow remote files to be downloaded by lack of validation. Vulnerabilities in downloading with Kupload agent allow files to be downloaded to arbitrary paths due to insufficient verification of extensions and download paths. This issue affects: RAONWIZ RAON KUpload 2018.0.2.50 versions and earlier.
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Analysis
by VulDB Data Team • 11/12/2020
The vulnerability identified as CVE-2020-7830 resides within RAONWIZ v2018.0.2.50 and earlier versions, specifically within the KUpload agent component that handles file download operations. This flaw represents a critical security weakness that undermines the integrity of the file handling mechanisms by failing to properly validate file extensions and destination paths during download processes. The vulnerability stems from inadequate input sanitization and path validation procedures that allow malicious actors to manipulate the download functionality to place files in arbitrary locations on the target system. The affected RAONWIZ RAON KUpload 2018.0.2.50 versions demonstrate a fundamental lack of proper access control and file system validation that creates an exploitable condition for remote code execution through unauthorized file placement.
The technical implementation of this vulnerability manifests through the KUpload agent's insufficient verification mechanisms that fail to properly validate file extensions and download paths before executing file transfer operations. Attackers can exploit this weakness by crafting malicious file names or manipulating the download parameters to bypass normal path restrictions and force file placement in system-critical directories. The vulnerability directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal attacks. This weakness allows adversaries to access files and directories that are stored outside the intended directory, potentially leading to unauthorized access to sensitive system resources. The flaw essentially removes the security boundaries that should normally protect against arbitrary file placement, enabling attackers to write files to locations where they would normally be restricted.
From an operational impact perspective, this vulnerability creates significant risk for organizations utilizing affected RAONWIZ versions as it allows remote attackers to potentially install malicious files on target systems without authentication. The ability to download files to arbitrary paths means that attackers could potentially place backdoor executables, malicious scripts, or other harmful content in system directories, application folders, or even in locations where they could gain elevated privileges. The vulnerability's remote exploitability means that attackers do not require physical access or local credentials to leverage this weakness, making it particularly dangerous in networked environments. This issue directly aligns with ATT&CK technique T1105 which describes remote file copying, where adversaries establish persistence by downloading and executing malicious files on compromised systems. The potential for privilege escalation increases significantly when attackers can place files in system directories or application paths that execute with elevated permissions.
Mitigation strategies for CVE-2020-7830 should focus on immediate patching of affected RAONWIZ versions to the latest available releases that address the insufficient validation issues. Organizations should implement strict file extension filtering and path validation mechanisms that prevent downloads to system-critical directories or locations outside of intended application paths. Network segmentation and access controls should be enforced to limit exposure of vulnerable systems to untrusted networks. The implementation of proper input validation, including whitelisting of allowed file extensions and restricting download paths to predefined safe directories, provides effective protection against this class of vulnerability. Security monitoring should include detection of unusual file creation patterns in system directories and network traffic analysis for suspicious download activities. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all instances of affected software versions and ensure that proper security controls are in place to prevent exploitation of similar weaknesses in other components of their infrastructure.