CVE-2012-1851 in Windows
Summary
by MITRE
Format string vulnerability in the Print Spooler service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote attackers to execute arbitrary code via a crafted response, aka "Print Spooler Service Format String Vulnerability."
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Analysis
by VulDB Data Team • 03/27/2021
The CVE-2012-1851 vulnerability represents a critical format string flaw within Microsoft Windows Print Spooler service that affects multiple operating system versions including windows xp sp2 and sp3, windows server 2003 sp2, windows vista sp2, windows server 2008 sp2 and r2, and windows 7 gold and sp1. This vulnerability resides in the print spooler service component that handles print job processing and management across the windows ecosystem. The flaw manifests when the service processes a crafted response containing malicious format specifiers that can lead to arbitrary code execution. According to the common weakness enumeration framework, this vulnerability maps to cwe-134 which specifically addresses the use of format strings with user-supplied data without proper validation or sanitization. The vulnerability operates by leveraging improper input validation within the print spooler service where it fails to properly validate format strings passed from external sources, creating an opportunity for attackers to inject malicious code through crafted print job parameters or network communications.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides remote attackers with the ability to execute arbitrary code with system-level privileges on affected systems. The print spooler service typically runs with high privileges, making this vulnerability particularly dangerous as it can be exploited without requiring local access or authentication. Attackers can leverage this flaw by sending specially crafted print job data or network responses that contain format string specifiers designed to overwrite memory locations and inject malicious code execution payloads. This vulnerability directly maps to attack technique t1059 in the attack framework, specifically targeting windows command and scripting interpreter to execute malicious code. The vulnerability's exploitation potential is amplified by the fact that print spooler services are often accessible over networks, making remote exploitation feasible from outside the local network perimeter. The attack surface is further expanded as many enterprise environments have print servers that are accessible from multiple network segments, potentially allowing lateral movement and privilege escalation throughout the network infrastructure.
Mitigation strategies for CVE-2012-1851 should encompass both immediate patching and network-level defensive measures. Microsoft released security update ms12-034 addressing this vulnerability, which should be deployed immediately across all affected systems following standard security patch management protocols. Organizations should implement network segmentation to limit access to print servers and spooler services, particularly restricting access from untrusted networks. The principle of least privilege should be enforced by ensuring print spooler services operate with minimal required permissions and that only authorized users have access to print job management capabilities. Network-based intrusion detection systems should be configured to monitor for suspicious print job data patterns and unusual print server communications that might indicate exploitation attempts. Additionally, administrators should disable unnecessary print services and implement proper access controls to prevent unauthorized users from submitting print jobs that could contain malicious format strings. The vulnerability's classification under cwe-134 emphasizes the importance of input validation and proper format string handling in all software components that process external data, making this a critical lesson in secure coding practices for software development teams. Regular security assessments and vulnerability scanning should include checks for print spooler service configurations and ensure that all systems have been updated with the appropriate security patches to prevent exploitation of this critical format string vulnerability.