CVE-2023-39147 in Uvdesk
Summary
by MITRE • 08/01/2023
An arbitrary file upload vulnerability in Uvdesk 1.1.3 allows attackers to execute arbitrary code via uploading a crafted image file.
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Analysis
by VulDB Data Team • 01/23/2026
The CVE-2023-39147 vulnerability represents a critical arbitrary file upload flaw in Uvdesk version 1.1.3 that enables remote attackers to execute arbitrary code through malicious image file uploads. This vulnerability falls under the category of insecure file upload implementations and directly violates security principles governing input validation and file handling processes. The flaw exists within the application's file upload mechanism where insufficient validation allows attackers to bypass security controls and upload potentially dangerous files that can be executed on the target system. The vulnerability is particularly concerning as it leverages the common practice of image file uploads while exploiting the trust placed in file extensions and content verification mechanisms.
The technical implementation of this vulnerability stems from inadequate file type validation and content inspection within the Uvdesk application. Attackers can craft malicious files that appear to be legitimate image formats such as jpg, png, or gif but contain executable code or malicious payloads. The system fails to properly verify the actual file content against the claimed file type, allowing attackers to upload files with extensions that match legitimate image formats while containing malicious code. This type of vulnerability is classified as CWE-434, which specifically addresses insecure file upload vulnerabilities where applications fail to properly validate file types and content. The flaw operates at the application layer and can be exploited through standard web application attack vectors, making it particularly dangerous in environments where the application is publicly accessible.
The operational impact of CVE-2023-39147 extends beyond simple code execution to encompass full system compromise and potential data breaches. Successful exploitation allows attackers to gain remote code execution capabilities, enabling them to install backdoors, exfiltrate sensitive data, or establish persistent access to the compromised system. The vulnerability can be leveraged in conjunction with other attack techniques from the MITRE ATT&CK framework, particularly those related to initial access and execution phases. Attackers may use this vulnerability to establish a foothold in the network, escalate privileges, or pivot to other systems within the organization's infrastructure. The impact is further amplified when considering that Uvdesk is commonly used for customer support and ticketing systems, making it a valuable target for attackers seeking access to sensitive customer information and business data.
Mitigation strategies for CVE-2023-39147 must address both immediate remediation and long-term security improvements within the application's file handling mechanisms. Organizations should prioritize applying the vendor-provided patches and updates to resolve the vulnerability in Uvdesk 1.1.3. Additionally, implementing robust file validation controls including MIME type checking, file content verification, and strict file extension restrictions can prevent similar vulnerabilities from occurring. Security measures should include server-side file type validation, mandatory content inspection using tools like file command or magic number detection, and proper file storage practices that separate uploaded files from executable code. Network-level protections such as web application firewalls and intrusion detection systems can provide additional layers of defense, while regular security assessments and code reviews should be conducted to identify and remediate similar vulnerabilities in other application components. The implementation of these controls aligns with security best practices outlined in industry standards and helps prevent exploitation of similar file upload vulnerabilities across different applications and platforms.