Zero-day vulnerability in Microsoft Word

Buffer overflow
CVE-2006-6561

This vulnerability was publicly disclosed by Disco Jonny.

Known malware:

Bloodhound.Exploit.108.

Vulnerability details

Advisory: SB2006121503 - Remote code execution in Microsoft Word

Vulnerable component: Microsoft Word

CVE-ID: CVE-2006-6561

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

CWE-ID: CWE-119 - Memory corruption

Description:

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

The vulnerability is caused by boundary error when processing  an unchecked word count in Word files. A remote attacker can create a specially crafted Word file, trick the victim into opening it and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability results in compromise of vulnerable system.

Note: this vulnerability is being actively exploited.


Public Exploits:

- Microsoft Word Document - (malformed pointer) (PoC) [Exploit-DB]

External links:

https://technet.microsoft.com/en-us/library/security/ms07-014.aspx
https://blogs.technet.microsoft.com/msrc/2006/12/15/update-on-current-word-vulnerability-reports/
https://www.symantec.com/security_response/writeup.jsp?docid=2006-121412-1329-99
https://www.symantec.com/connect/blogs/word-those-word-vulnerabilities

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.