CVE-2006-5869 in pstotext
Summary
by MITRE
pstotext before 1.9 allows user-assisted attackers to execute arbitrary commands via shell metacharacters in a file name.
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Analysis
by VulDB Data Team • 04/28/2026
The vulnerability identified as CVE-2006-5869 affects the pstotext utility version 1.9 and earlier, representing a critical command injection flaw that enables user-assisted attackers to execute arbitrary system commands. This vulnerability resides within the PostScript to text conversion tool that is part of the ghostscript package, which is widely used for converting PostScript documents into text format. The flaw manifests when the utility fails to properly sanitize file names passed to it, allowing maliciously crafted filenames containing shell metacharacters to be interpreted as command sequences rather than literal file identifiers. The vulnerability operates under the context of user-assisted attack vectors where an attacker must convince a victim to process a specially crafted PostScript file through the vulnerable pstotext utility, making it a privilege escalation vulnerability that requires social engineering or trusted user interaction to exploit effectively.
The technical implementation of this vulnerability stems from insufficient input validation and improper shell command construction within the pstotext utility. When the utility processes a PostScript file, it may pass file names directly to shell commands without proper sanitization or escaping of special characters. Shell metacharacters such as semicolons, ampersands, backticks, and pipes can be interpreted by the shell as command separators or operators, allowing attackers to inject additional commands that execute with the privileges of the user running the pstotext utility. This type of vulnerability aligns with CWE-78, which specifically addresses improper neutralization of special elements used in OS commands, and represents a classic command injection attack pattern that has been documented extensively in security literature. The attack requires minimal privileges to execute and can potentially allow full system compromise if the utility runs with elevated permissions.
The operational impact of this vulnerability extends beyond simple command execution to encompass significant security implications for systems that process untrusted PostScript content. Organizations utilizing pstotext in automated processing environments or those that accept file uploads from untrusted sources face heightened risk of unauthorized system access and potential data exfiltration. The vulnerability can be exploited in various attack scenarios including web application exploitation where PostScript files are processed server-side, automated document conversion systems, or any environment where users can submit content that gets processed through the vulnerable utility. The attack vector demonstrates characteristics consistent with ATT&CK technique T1059.001, which covers command and scripting interpreter execution, and T1203, which addresses exploitation for privilege escalation through user-assisted attacks. Systems with elevated privileges running the vulnerable utility pose the greatest risk as attackers can potentially escalate privileges to root or system-level access depending on the execution context.
Mitigation strategies for CVE-2006-5869 should prioritize immediate patching of affected systems with versions of pstotext 1.9 or later where the vulnerability has been addressed through proper input sanitization and shell command construction. Organizations should implement comprehensive input validation measures that escape or remove shell metacharacters from file names before processing, and consider adopting a principle of least privilege for systems running the utility. Additional defensive measures include restricting file upload capabilities, implementing file type validation, and deploying network-based intrusion detection systems to monitor for suspicious command execution patterns. Security administrators should also conduct thorough vulnerability assessments of all systems that may process PostScript content and ensure that the ghostscript package and related utilities are kept current with security patches. The vulnerability serves as a reminder of the critical importance of proper input validation and secure coding practices, particularly in utilities that interact with shell commands and process user-supplied data, and aligns with security frameworks that emphasize defense in depth through multiple layers of protection.