Zero-day vulnerability in Windows

Information disclosure
CVE-2017-0147

On April 14, 2017 the Shadow Brokers team made the exploit pack publicly available. The exploits are believed to be stolen from the NSA.

Known malware:

EternalChampion exploit

Vulnerability details

Advisory: SB2017031416 - Multiple vulnerabilities in Microsoft Windows SMB Server

Vulnerable component: Windows

CVE-ID: CVE-2017-0147

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

CWE-ID: CWE-200 - Information exposure

Description:

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to an error when parsing requests in Microsoft Server Message Block 1.0 (SMBv1) server. A remote unauthenticated attacker can send specially crafted SMB packets and gain access to potentially sensitive data.

Successful exploitation of this vulnerability may allow an attacker to gain access to potentially sensitive information.

Note: this vulnerability has been exploited in the wild and is publicly known as EternalChampion exploit.

Public Exploits:

- Microsoft Windows - Uncredentialed SMB RCE (MS17-010) (Metasploit) [Exploit-DB]

- Microsoft Windows - SrvOs2FeaToNt SMB Remote Code Execution (MS17-010) [Exploit-DB]

External links:

https://github.com/misterch0c/shadowbroker/
https://blogs.technet.microsoft.com/msrc/2017/04/14/protecting-customers-and-evaluating-risk/

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.