Zero-day vulnerability in Microsoft SharePoint Server

Cross-site scripting
CVE-2010-0817

Known malware:

Exploit: Win32/CVE-2010-0817

Vulnerability details

Advisory: SB2010060801 - Multiple vulnerabilities in Microsoft SharePoint

Vulnerable component: Microsoft SharePoint Server

CVE-ID: CVE-2010-0817

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

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Description:

The vulnerability allows a remote attacker to perform XSS attacks.

The vulnerability exists due to insufficient sanitization of user-supplied input data passed to Help.aspx script. A remote attacker can trick the victim into following a specially crafted link and execute arbitrary HTML and script code in victimтАЩs browser in context of vulnerable SharePoint website.

Successful exploitation may allow an attacker to conduct phishing and drive-by-download attacks.

Note: this vulnerability is being publicly exploited.

Public Exploits:

- Microsoft SharePoint Server 2007 - Cross-Site Scripting [Exploit-DB]

External links:

https://www.htbridge.com/advisory/HTB22350
https://technet.microsoft.com/en-us/library/security/ms10-039.aspx

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.