CVE-2023-32085 in Windows
Summary
by MITRE • 07/11/2023
Microsoft PostScript and PCL6 Class Printer Driver Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 06/28/2026
This vulnerability resides in Microsoft's PostScript and PCL6 class printer drivers where improper handling of certain printer commands can lead to information disclosure through memory exposure. The flaw manifests when the printer driver processes specific print jobs containing crafted data structures that cause the system to inadvertently expose sensitive memory contents including stack data, heap information, or other internal driver state. Such exposure occurs during the processing of printer commands that should be handled securely but instead trigger memory access patterns that leak confidential information to unauthorized parties.
The technical implementation involves the printer driver's insufficient validation of input parameters within its command parsing routines and memory management functions. When a malicious print job containing specially crafted PostScript or PCL6 commands is processed, the driver fails to properly sanitize memory operations, resulting in accidental data leakage through various memory access mechanisms. This vulnerability typically affects systems where these printer drivers are installed and actively processing print requests from networked or local sources. The information disclosure can include sensitive data such as internal pointers, system memory contents, or other confidential information that could aid attackers in subsequent exploitation attempts.
The operational impact of this vulnerability extends beyond simple information leakage as it provides attackers with valuable reconnaissance data that can be leveraged for more sophisticated attacks. An attacker who gains access to the printer queue or can submit malicious print jobs can potentially extract system memory contents that reveal internal driver structures, stack layouts, or other implementation details. This information disclosure creates opportunities for advanced persistent threats where the leaked data can be used to bypass security mechanisms, understand driver behavior patterns, or aid in developing more targeted exploits against the same system or similar components. The vulnerability particularly affects enterprise environments where printer systems are extensively networked and where multiple users may have access to shared print queues.
Mitigation strategies should focus on immediate patching of affected Microsoft printer drivers through official update channels and implementing network segmentation to limit exposure of printer systems. Organizations should also consider disabling unnecessary printer services and implementing strict access controls for print job submission. The vulnerability aligns with CWE-200 which addresses information disclosure issues and can be categorized under ATT&CK technique T1547.009 related to printer vulnerabilities. Additional protective measures include monitoring print queue activities for unusual command patterns, implementing network-based intrusion detection systems to identify potential exploitation attempts, and regularly auditing printer driver configurations to ensure only necessary components remain active. System administrators should also consider deploying printer driver whitelisting solutions that restrict execution of unauthorized driver components while maintaining essential printing functionality across the enterprise environment.