CVE-2013-1291 in Windows
Summary
by MITRE
win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, Windows 7 Gold and SP1, and Windows 8 allows local users to cause a denial of service (reboot) via a crafted OpenType font, aka "OpenType Font Parsing Vulnerability" or "Win32k Font Parsing Vulnerability."
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Analysis
by VulDB Data Team • 05/07/2021
The vulnerability identified as CVE-2013-1291 represents a critical flaw in the Windows kernel-mode driver component known as win32k.sys which governs graphical user interface operations and font rendering within Microsoft Windows operating systems. This vulnerability specifically affects a wide range of Windows versions including Windows XP SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, Windows 7 Gold and SP1, and Windows 8. The flaw manifests through improper handling of OpenType font files during the parsing process, creating a condition where maliciously crafted font data can trigger system instability. The vulnerability is categorized under CWE-125 as an out-of-bounds read condition, where the kernel-mode driver fails to properly validate font file structures before processing them, leading to memory access violations that can cause system crashes.
The technical exploitation of this vulnerability occurs when a local attacker presents a specially crafted OpenType font file to the Windows system, typically through normal font installation processes or when applications attempt to render or display font content. The win32k.sys driver, responsible for managing windowing system operations and font handling in kernel space, processes the malformed font data without adequate bounds checking or input validation. This processing failure results in memory corruption that ultimately triggers a system reboot or blue screen of death. The vulnerability operates at the kernel level, meaning that exploitation does not require elevated privileges beyond normal user access, making it particularly dangerous as any local user can potentially trigger the denial of service condition. The ATT&CK framework categorizes this as a privilege escalation technique through system service manipulation, where the vulnerability enables an attacker to disrupt normal system operations.
The operational impact of CVE-2013-1291 extends beyond simple denial of service scenarios, as it can be leveraged in more sophisticated attack vectors. While the primary effect is system reboot, the instability introduced by this vulnerability can provide attackers with opportunities to execute additional malicious code or escalate privileges. The vulnerability's presence in multiple Windows versions across different product lines creates widespread exposure, particularly in enterprise environments where legacy systems may not have been updated. Organizations running affected systems face potential disruption of business operations, as system reboots can occur unexpectedly during critical operations. The vulnerability's nature as a kernel-mode flaw means that it can potentially bypass many traditional security controls, as the exploitation occurs at a level below user-space protections and application firewalls.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected systems through Microsoft security updates, as the vendor released patches specifically addressing the win32k.sys font parsing issue. System administrators should implement comprehensive patch management procedures to ensure all affected Windows versions receive the necessary security updates. Additional protective measures include implementing font filtering policies that restrict the installation and processing of potentially malicious font files, particularly those from untrusted sources. The principle of least privilege should be enforced to limit local user capabilities and reduce the attack surface available to potential exploiters. Network segmentation and monitoring systems should be deployed to detect unusual reboot patterns or font-related system events that might indicate exploitation attempts. Organizations should also consider implementing application whitelisting solutions that prevent unauthorized font installation processes and maintain regular system audits to identify and remediate any remaining vulnerable systems within their infrastructure.