CVE-1999-0551 in OpenMail
Summary
by MITRE
HP OpenMail can be misconfigured to allow users to run arbitrary commands using malicious print requests.
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Analysis
by VulDB Data Team • 04/17/2026
This vulnerability exists in HP OpenMail software where improper configuration allows users to execute arbitrary commands through malicious print requests. The flaw stems from insufficient input validation and privilege escalation mechanisms within the print processing functionality. When users submit print requests containing specially crafted commands, the system fails to properly sanitize the input before processing, enabling attackers to inject and execute arbitrary code with the privileges of the print service account. This represents a critical security weakness that violates the principle of least privilege and demonstrates poor input sanitization practices. The vulnerability can be classified under CWE-78 as "Improper Neutralization of Special Elements used in an OS Command" and aligns with ATT&CK technique T1059.001 for command and scripting interpreter. The impact extends beyond simple command execution as it can lead to complete system compromise, data exfiltration, and persistence mechanisms within the email infrastructure.
The technical exploitation occurs when malicious print requests contain OS command injection payloads that bypass normal security controls. HP OpenMail's print subsystem lacks proper validation of print job parameters, allowing attackers to manipulate the command execution flow. This misconfiguration creates a path for attackers to escalate privileges and potentially gain access to sensitive email data and system resources. The vulnerability is particularly dangerous because it operates within the legitimate print processing framework, making detection more challenging. Attackers can leverage this weakness to execute commands such as file transfers, system reconnaissance, or even establish backdoors within the email environment. The flaw demonstrates inadequate security controls in the print subsystem and highlights the importance of proper input validation and privilege separation. Organizations using HP OpenMail systems face significant risk from this vulnerability, especially in environments where email servers handle sensitive communications and where proper security hardening has not been implemented.
Organizations should implement immediate mitigations including proper configuration of HP OpenMail print subsystems to disable unnecessary print functionality and enforce strict input validation for all print requests. System administrators must ensure that print jobs are processed with minimal privileges and that command execution is properly restricted. Network segmentation and access controls should be implemented to limit exposure of print services to unauthorized users. Security patches and updates from HP should be applied immediately to address the underlying configuration issues. Regular security audits should verify that print subsystems are properly configured and that no unnecessary command execution capabilities remain enabled. The vulnerability underscores the importance of following security best practices such as implementing the principle of least privilege and conducting regular security assessments of email infrastructure components. Organizations should also consider implementing intrusion detection systems to monitor for suspicious print request patterns and maintain detailed logging of print activities for forensic analysis purposes.