CVE-2008-5718 in Netatalk
Summary
by MITRE
The papd daemon in Netatalk before 2.0.4-beta2, when using certain variables in a pipe command for the print file, allows remote attackers to execute arbitrary commands via shell metacharacters in a print request, as demonstrated using a crafted Title.
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Analysis
by VulDB Data Team • 05/24/2025
The vulnerability identified as CVE-2008-5718 affects the papd daemon component within Netatalk software versions prior to 2.0.4-beta2. This daemon serves as a print server implementation that handles printer job processing and file management for AppleTalk networks. The issue manifests when the papd daemon processes print requests that contain specific variables within pipe commands, creating a dangerous execution path that can be exploited by remote attackers. The vulnerability specifically leverages shell metacharacters within print job titles to inject and execute arbitrary commands on the target system. This represents a classic command injection flaw that enables attackers to bypass normal access controls and execute malicious code with the privileges of the papd daemon process.
The technical flaw resides in the improper sanitization and handling of user-supplied input within print job metadata, particularly the Title field of print requests. When the papd daemon receives a print job with a crafted Title containing shell metacharacters such as semicolons, ampersands, or backticks, it fails to properly escape or validate these characters before incorporating them into shell commands. This allows attackers to inject additional shell commands that execute in the context of the print daemon, potentially leading to complete system compromise. The vulnerability operates at the application layer and demonstrates a lack of proper input validation and output encoding practices. According to CWE classification, this maps to CWE-78, which specifically addresses "Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')". The flaw exists in the daemon's handling of print job variables without adequate sanitization of shell metacharacters.
The operational impact of this vulnerability is significant and far-reaching for systems running affected Netatalk versions. Remote attackers can exploit this vulnerability to execute arbitrary commands on the target system without requiring authentication, making it particularly dangerous in networked environments where print services are exposed to untrusted networks. Successful exploitation could enable attackers to gain shell access, escalate privileges, install backdoors, or perform data exfiltration. The vulnerability affects systems where the papd daemon is actively processing print jobs, particularly those that accept print requests from external sources or networks. Attackers can craft malicious print jobs with specially formatted titles that trigger the command injection when the print daemon processes these requests. This vulnerability directly aligns with ATT&CK technique T1059.001 for "Command and Scripting Interpreter: Shell Script" and T1068 for "Exploitation for Privilege Escalation" when considering the potential for privilege escalation through command execution.
Mitigation strategies for CVE-2008-5718 primarily involve upgrading to Netatalk version 2.0.4-beta2 or later, which includes proper input validation and sanitization of print job metadata. Organizations should also implement network segmentation to limit access to print services, disable unnecessary print server functionality, and monitor print job processing for suspicious activity. Additionally, administrators should consider implementing input filtering at the network level and regularly audit print server configurations. The fix implemented in Netatalk 2.0.4-beta2 addresses the root cause by properly escaping shell metacharacters in print job variables before executing any shell commands. Security teams should also consider implementing intrusion detection systems to monitor for patterns consistent with command injection attempts and maintain regular vulnerability assessments of network services to identify similar weaknesses in other applications.