Zero-day Vulnerability Database

Memory corruption

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to boundary error in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers. A remote attacker can create a specially crafted Word document or web page containing font data, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Denial of service

The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to an error in the Remote Desktop Protocol when processing a sequence of malicious packets. A remote attacker can send a specially crafted RDP packets, gain access to an object that was not properly initialized or is deleted and cause the system to stop responding and restart.

Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Note: the vulnerability was being actively exploited.

Privilege escalation

The vulnerability allows a local user to gain elevated privileges on the target system.

The vulnerability exists due to improper validation of input passed from user mode to the kernel in the Ancillary Function Driver (afd.sys). By running a malicious application, a local attacker with valid login credentials can execute arbitrary code with system privileges.

Successful exploitation of this vulnerability will allow the local attacker to obtain elevated privileges on vulnerable system.

Note: the vulnerability was being actively exploited.

Memory corruption

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to boundary error related to time element when Internet Explorer attempts to access objects that have not been correctly initialized or have been deleted. A remote attacker can create a specially crafted Web site, trick the victim into visiting it, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability may result in arbitrary code execution on the vulnerable system.

Note: According to experts from M86, the vulnerability was exploited in targeted attacks before the official patch release from Microsoft.

Improper input validation

The vulnerability allows a local user to obtain elevated privileges on the target system.

The vulnerability exists due to improper managing of Keyboard Layout files by the kernel-mode driver (win32k.sys). A local attacker can execute arbitrary code on vulnerable system with SYSTEM privileges.

Successful exploitation of this vulnerability will allow the local attacker to obtain elevated privileges on vulnerable system.

Note: the vulnerability was being actively exploited.

Use-after-free error

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to use-after-free error when handling layout objects that have not been correctly initialized or have been deleted. A remote attacker can create a specially crafted Web site, trick the victim into visiting it, trigger memory corruption and execute arbitrary code on the system with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Cross-site scripting

The vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-input passed via MIME-formatted requests for content blocks within a document. A remote attacker can trick the victim to follow a specially crafted "MHTML:" link and execute arbitrary HTML and script code in user’s browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Memory corruption

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to boundary error when handling onPropertyChange function calls. A remote attacker can create a specially crafted Web site, trick the victim into visiting it, trigger memory corruption and execute arbitrary code on the system with privileges of the current user.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.