CVE-2017-8554 in Windows
Summary
by MITRE
The kernel in Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allows an authenticated attacker to obtain memory contents via a specially crafted application.
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Analysis
by VulDB Data Team • 12/30/2020
This vulnerability represents a critical information disclosure flaw in the Windows kernel that affects multiple operating system versions including windows 7 sp1, windows server 2008 sp2 and r2 sp1, windows 8.1, windows rt 8.1, windows server 2012 and r2, windows 10 versions 1511, 1607, and 1703, as well as windows server 2016. The vulnerability stems from improper validation of memory access patterns within the kernel's handling of certain system calls, creating an opportunity for authenticated attackers to extract sensitive memory contents from the target system. This issue falls under the weakness category of cwe-200, which specifically addresses improper information disclosure, and aligns with attack techniques described in the attack pattern taxonomy under credential compromise and privilege escalation activities. The flaw occurs when the kernel fails to properly validate memory access requests from user-mode applications, allowing malicious code to potentially read arbitrary memory locations that should be protected from unauthorized access.
The technical implementation of this vulnerability exploits the kernel's memory management subsystem by crafting specially designed applications that manipulate memory access patterns to bypass normal kernel security boundaries. An authenticated user with a valid account on the target system can leverage this flaw to obtain memory contents that may include sensitive data such as passwords, encryption keys, or other confidential information stored in kernel memory regions. The vulnerability does not require administrative privileges for exploitation but rather relies on the attacker's ability to execute code within the context of a legitimate user session. This makes the attack vector particularly concerning as it can be initiated by any user who has access to the system, potentially through social engineering or other means of gaining legitimate user credentials. The attack typically involves sending crafted requests to kernel functions that handle memory operations, which then return memory contents without proper access control verification.
The operational impact of this vulnerability extends beyond simple information disclosure, as the extracted memory contents could contain sensitive cryptographic keys, user credentials, or system configuration data that could be used for further attacks. Attackers could potentially leverage this information to perform credential theft, escalate privileges to system level access, or conduct advanced persistent threat campaigns. The vulnerability's presence across multiple windows versions means that organizations with heterogeneous environments face increased risk exposure, as the flaw exists in both desktop and server operating systems. This creates a significant challenge for security teams who must ensure all affected systems receive patches simultaneously, as the vulnerability can be exploited through various attack vectors including malicious software installation, web-based attacks, or even physical access scenarios where an attacker can log in with valid credentials. The flaw essentially creates a backdoor for memory access that bypasses normal security boundaries, making it particularly dangerous in enterprise environments where sensitive data is constantly processed and stored in kernel memory.
Mitigation strategies for this vulnerability should focus on immediate patch deployment as provided by microsoft security updates, which address the underlying kernel memory validation issues. Organizations should implement network segmentation and access controls to limit user access to critical systems, while also monitoring for unusual memory access patterns that might indicate exploitation attempts. Security teams should conduct regular vulnerability assessments to identify systems running affected operating systems and prioritize patching efforts based on risk assessment. Additional protective measures include implementing application whitelisting policies to prevent execution of unauthorized code, enabling kernel mode protection features, and maintaining comprehensive monitoring of system calls and memory access patterns. The vulnerability also underscores the importance of principle of least privilege enforcement and regular security audits to identify and remediate similar issues before they can be exploited by malicious actors. Organizations should also consider implementing advanced threat detection systems that can identify anomalous memory access patterns consistent with this type of exploit, as traditional signature-based detection may not be sufficient to identify all exploitation attempts.