CVE-2017-8684 in Windows
Summary
by MITRE
Windows GDI+ on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT 8.1, allows information disclosure by the way it discloses kernel memory addresses, aka "Windows GDI+ Information Disclosure Vulnerability". This CVE ID is unique from CVE-2017-8685 and CVE-2017-8688.
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Analysis
by VulDB Data Team • 01/12/2021
The vulnerability identified as CVE-2017-8684 represents a critical information disclosure flaw within Windows GDI+ subsystem that affects multiple Windows operating systems including server and client versions. This vulnerability specifically manifests when the graphics device interface plus component discloses kernel memory addresses through improper error handling mechanisms. The flaw resides in how GDI+ processes certain graphics operations and subsequently handles error conditions, creating opportunities for attackers to extract sensitive kernel memory addresses from the system. The vulnerability impacts Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT 8.1 platforms, making it particularly concerning given the widespread deployment of these operating systems in enterprise environments.
The technical implementation of this vulnerability involves the improper handling of graphics object validation within the GDI+ component. When processing certain malformed graphics operations, the system fails to properly sanitize memory addresses before returning error responses, inadvertently exposing kernel memory locations to user-mode applications. This information disclosure occurs through the graphics rendering pipeline where kernel memory addresses are leaked during error processing, allowing attackers to gain insights into the kernel's memory layout. The vulnerability is categorized under CWE-200, which specifically addresses "Information Exposure," and aligns with ATT&CK technique T1059.001 for command and scripting interpreter execution, as attackers can use the leaked information to facilitate more sophisticated attacks. The memory address disclosure provides attackers with valuable information for bypassing exploit mitigations such as address space layout randomization and other security mechanisms.
The operational impact of CVE-2017-8684 extends beyond simple information disclosure, as the leaked kernel addresses can serve as critical intelligence for developing more advanced exploitation techniques. Attackers can leverage the disclosed memory addresses to craft more precise buffer overflow exploits or to bypass modern security features that rely on memory layout unpredictability. The vulnerability creates a pathway for privilege escalation attacks where the leaked information helps attackers understand the target system's memory structure, potentially enabling them to perform more sophisticated attacks such as return-oriented programming or other advanced exploitation techniques. Organizations running affected systems face significant risk as this vulnerability can be exploited remotely through various attack vectors including malicious web content or crafted graphics files, making it particularly dangerous in enterprise environments where users may encounter untrusted content.
Mitigation strategies for CVE-2017-8684 focus primarily on applying Microsoft security updates and patches that address the specific memory handling issues within GDI+. Organizations should prioritize immediate patch deployment across all affected systems to eliminate the vulnerability. Additional defensive measures include implementing network segmentation to limit exposure, disabling unnecessary graphics rendering capabilities where possible, and monitoring for suspicious graphics-related activity that might indicate exploitation attempts. Security teams should also consider implementing application whitelisting policies that restrict execution of untrusted graphics content and maintain comprehensive logging of graphics operations to detect potential exploitation attempts. The vulnerability demonstrates the importance of proper input validation and error handling in system components, particularly those handling user-supplied data, as highlighted by the ATT&CK framework's emphasis on preventing information disclosure through proper system design and implementation practices.