CVE-2008-7319 in Net::Ping::External
Summary
by MITRE
The Net::Ping::External extension through 0.15 for Perl does not properly sanitize arguments (e.g., invalid hostnames) containing shell metacharacters before use of backticks in External.pm, allowing for shell command injection and arbitrary command execution if untrusted input is used.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 01/06/2023
The vulnerability described in CVE-2008-7319 represents a critical security flaw in the Net::Ping::External Perl extension, which has been widely used for network connectivity testing and monitoring purposes. This extension operates by executing external ping commands through backtick operators, making it susceptible to shell injection attacks when processing user-provided input. The vulnerability specifically affects versions through 0.15 and demonstrates a classic improper input validation issue that has plagued many network security tools throughout the years.
The technical root cause of this vulnerability stems from the extension's failure to properly sanitize input parameters before incorporating them into shell commands executed via backticks. When the extension receives hostname or network parameter input from external sources, it directly interpolates this data into shell command strings without adequate sanitization or escaping mechanisms. This design flaw allows attackers to inject shell metacharacters such as semicolons, ampersands, or command substitution operators that can alter the intended execution flow of the underlying ping command. The CWE-78 weakness classification applies here, as the extension fails to properly neutralize special elements within shell command strings, creating a direct path for command injection attacks.
The operational impact of this vulnerability extends far beyond simple network testing capabilities, as it can enable complete system compromise when the extension is used in environments with untrusted input sources. Attackers can leverage this vulnerability to execute arbitrary commands with the privileges of the process running the Net::Ping::External extension, potentially leading to full system compromise, data exfiltration, or lateral movement within network infrastructure. This risk is particularly severe in monitoring systems, network management tools, or automated security applications that rely on this extension for network connectivity verification, as these systems often run with elevated privileges and may process input from multiple sources. The ATT&CK framework's T1059.001 technique for command and scripting interpreter applies directly to this vulnerability, as it enables adversaries to execute arbitrary commands through shell injection.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements in input handling practices. The most direct solution involves upgrading to a patched version of the Net::Ping::External extension where proper input sanitization has been implemented. Organizations should also consider implementing input validation layers that reject or escape special shell characters before any processing occurs, and where possible, replace backtick-based command execution with safer alternatives that do not involve shell interpretation. Additionally, system administrators should ensure that the extension runs with minimal required privileges and that input sources are properly validated and sanitized at multiple layers of the application architecture to prevent similar vulnerabilities from manifesting in other components.