CVE-2023-21693 in Windows
Summary
by MITRE • 02/14/2023
Microsoft PostScript Printer Driver Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 03/15/2023
The CVE-2023-21693 vulnerability represents a critical information disclosure flaw within the Microsoft PostScript Printer Driver component that affects multiple Windows operating systems. This vulnerability resides in the printer driver infrastructure that processes PostScript print jobs, creating an attack surface where sensitive information could be inadvertently exposed to unauthorized parties. The flaw specifically manifests when the driver handles certain printer job parameters or configuration data, potentially allowing attackers to access internal system information that should remain protected within the print processing pipeline. Such information disclosure vulnerabilities are particularly concerning in enterprise environments where printer systems often serve as entry points for broader network infiltration attempts.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the PostScript printer driver module. When processing print jobs containing malformed or specially crafted PostScript commands, the driver fails to properly isolate sensitive data from the processing context, resulting in unintended information exposure. This flaw aligns with CWE-200, which categorizes information exposure vulnerabilities where sensitive data is accessible to unauthorized actors. The vulnerability can be exploited through various attack vectors including malicious print job submissions, printer sharing configurations, or compromised print server environments where attackers can manipulate the driver's handling of print data. The underlying mechanism typically involves improper memory management or buffer handling when the driver processes PostScript elements that contain embedded metadata or configuration information.
The operational impact of CVE-2023-21693 extends beyond simple data exposure, creating potential pathways for more sophisticated attacks within network environments. Organizations may experience unauthorized access to printer configuration details, user credentials stored in print queues, or system information that could aid in further reconnaissance activities. The vulnerability's exploitation can lead to privilege escalation opportunities when combined with other weaknesses, particularly in environments where printer services are poorly isolated from core network infrastructure. According to ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and T1212 (Exploitation for Credential Access) techniques, as attackers can leverage the information disclosure to gather intelligence about system configurations and potentially extract authentication tokens or credentials. The risk is amplified in multi-tenant environments or organizations with complex print server architectures where the exposed information could reveal network topology or user access patterns.
Mitigation strategies for CVE-2023-21693 should prioritize immediate patch application from Microsoft, as the vendor has released security updates specifically addressing this information disclosure vulnerability. Organizations must implement network segmentation to isolate print server environments from critical internal systems, ensuring that printer services operate in restricted network zones with minimal access privileges. Additional protective measures include disabling unnecessary printer sharing features, implementing strict access controls on print queue management, and monitoring print job submissions for anomalous patterns that might indicate exploitation attempts. Security teams should conduct comprehensive vulnerability assessments focusing on printer infrastructure, particularly examining how print jobs are processed and what information is exposed during the print processing lifecycle. The implementation of network monitoring solutions capable of detecting unusual print job behaviors or data flows can provide early warning indicators of potential exploitation attempts. Regular security auditing of print server configurations and maintaining updated documentation of printer driver versions helps ensure that organizations remain protected against similar vulnerabilities in the future.