External risk intelligence

Microsoft Win32k Privilege Escalation Vulnerability

CVE advisoryKnown Exploit

CVE-2013-3660

The vulnerability exists within the Windows kernel-mode driver (win32k.sys) and requires a local user to execute specific code to trigger the issue and gain privileges. It is not reachable via the network and lacks any public-facing or internet-exposed attack surface in common deployment patterns.

Memory Corruption

Microsoft Windows 7

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability exists in Microsoft Windows kernel-mode drivers. A flaw in how a pointer is initialized can allow local users to gain elevated privileges. Exploitation could lead to unauthorized write access within system memory, potentially impacting system stability and data integrity.

Vulnerable Windows kernel drivers
Uninitialized pointer for object lists
Local privilege escalation and data manipulation

Attack Path

How an attacker could exploit the issue

This vulnerability allows a local attacker to escalate privileges within the Windows operating system. The attack involves triggering an issue within the kernel-mode drivers related to memory initialization. By causing excessive memory consumption and then making specific function calls, an attacker can gain write access to a critical memory chain, ultimately leading to elevated permissions. This type of attack can impact system stability and potentially lead to unauthorized data access or modification.

Requires local access.
Triggers excessive memory use.
Leads to privilege escalation.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability, residing within Microsoft's Windows kernel-mode drivers, presents a risk of privilege escalation for local users. Attackers with the necessary access could exploit this flaw to gain higher levels of control over affected systems. The potential for unauthorized access and control translates to a significant business risk.

Likely attacker skill level: Moderate
Required access or conditions: Local access
Business risk or urgency: High

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability may allow local users to gain elevated privileges within affected Windows systems. Organizations should prioritize identifying all assets impacted by this vulnerability, followed by steps to reduce exposure and apply necessary vendor-provided security updates. Continuous monitoring for related security events is also recommended to ensure the integrity of the environment.

Identify affected systems and data.
Reduce exposure or isolate risk.
Apply fix, verify, and monitor.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is win32k.sys in Microsoft Windows?

win32k.sys is a core component of the Microsoft Windows kernel-mode drivers. It handles graphics, windowing, and user interface elements, essentially managing how applications interact with the operating system's display and input.

What type of weakness does CVE-2013-3660 represent?

CVE-2013-3660 is classified as a buffer overflow vulnerability (CWE-119). This means that a program attempts to write more data to a buffer than it is designed to hold, potentially overwriting adjacent memory and leading to unintended consequences like privilege escalation.

How can an attacker trigger the vulnerability in CVE-2013-3660?

An attacker must first have local access to the affected system. They then need to trigger excessive consumption of paged memory and subsequently make numerous FlattenPath function calls to exploit the uninitialized pointer, leading to the vulnerability.

Who needs to be concerned about CVE-2013-3660?

Organizations running affected versions of Microsoft Windows should be concerned. According to Halo Surface Signal analysis, this vulnerability is classified as internal, meaning it requires local access to the system rather than being exposed directly to the internet.

What is the first step to address CVE-2013-3660?

The initial step is to identify all systems running the affected versions of Microsoft Windows. After identification, organizations should focus on reducing the potential for exploitation and applying security updates provided by Microsoft.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.