Zero-day vulnerability in Windows

Denial of service
CVE-2011-1968

Vulnerability details

Advisory: SB2011080901 - Denial of service in Microsoft RDP

Vulnerable component: Windows

CVE-ID: CVE-2011-1968

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:F/RL:O/RC:C

CWE-ID: CWE-399 - Resource Management Errors

Description:

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.

External links:

https://technet.microsoft.com/library/security/ms11-065
https://www.symantec.com/security_response/vulnerability.jsp?bid=48995

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.