CVE-2017-16666 in Xplico
Summary
by MITRE
Xplico before 1.2.1 allows remote authenticated users to execute arbitrary commands via shell metacharacters in the name of an uploaded PCAP file. NOTE: this issue can be exploited without authentication by leveraging the user registration feature.
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Analysis
by VulDB Data Team • 01/02/2025
CVE-2017-16666 represents a critical command injection vulnerability in Xplico versions prior to 1.2.1 that enables remote attackers to execute arbitrary code on affected systems. This vulnerability stems from insufficient input validation and sanitization of PCAP file names during the upload process, creating a path for malicious actors to inject shell metacharacters that are subsequently interpreted by the system. The flaw exists within the file handling mechanism where user-supplied filenames are directly incorporated into system commands without proper escaping or filtering of special characters. This type of vulnerability maps directly to CWE-77 which defines improper neutralization of special elements used in a command, and falls under the broader category of command injection attacks that are catalogued in the MITRE ATT&CK framework under technique T1059.001 for Command and Scripting Interpreter.
The operational impact of this vulnerability extends beyond simple privilege escalation as it allows attackers to gain full control over the affected system. When a malicious user uploads a specially crafted PCAP file with shell metacharacters embedded in the filename, these characters are processed by the underlying system commands that handle file operations, potentially leading to arbitrary code execution with the privileges of the Xplico service account. The vulnerability's authentication requirements are particularly concerning as it can be exploited by unauthenticated users through the user registration feature, effectively eliminating any access control barriers. This makes the attack surface significantly larger and more accessible to threat actors who may not require prior credentials to compromise the system.
The exploitation of this vulnerability follows a predictable pattern where attackers first register an account, then upload a malicious PCAP file containing shell injection payloads such as semicolons, ampersands, or backticks that are interpreted by the system shell. The command injection occurs during the processing of the PCAP file when the application constructs system commands using the user-provided filename without proper sanitization. This vulnerability is particularly dangerous in environments where Xplico is deployed as a network forensics tool, as it could be leveraged by attackers to compromise forensic analysis capabilities and potentially gain access to sensitive network traffic data. Organizations using Xplico should immediately implement mitigations including input validation, proper command escaping, and application updates to version 1.2.1 or later to address this critical security flaw.
The vulnerability demonstrates a fundamental weakness in input validation practices within network forensic analysis tools, where the assumption is made that uploaded files will not contain malicious content. This type of attack highlights the importance of secure coding practices and the principle of least privilege in security tool implementation. The issue also underscores the need for proper sandboxing and containment of file processing operations to prevent command injection attacks from escalating to system compromise. Organizations should review their security configurations and ensure that all file upload mechanisms properly validate and sanitize user inputs to prevent similar vulnerabilities from being exploited in other applications.