Zero-day vulnerability in Microsoft Excel

Integer Overflow or Wraparound
CVE-2009-0561

According to Symantec the first exploitation of the vulnerability was discovered on 11.01.2009.

Known malware:

Bloodhound.Exploit.251

Vulnerability details

Advisory: SB2009060902 - Multiple vulnerabilities in Microsoft Excel

Vulnerable component: Microsoft Excel

CVE-ID: CVE-2009-0561

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

CWE-ID: CWE-190 - Integer overflow

Description:

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

The weakness exists due to integer overflow when parsing the Excel spreadsheet file format. A remote attacker can create a specially crafted Excel file containing a malformed object record, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system with privileges of the current user.

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

External links:

https://technet.microsoft.com/en-us/library/security/ms09-021.aspx
https://www.symantec.com/security_response/writeup.jsp?docid=2009-061802-2317-99&tabid=2
https://www.symantec.com/security_response/writeup.jsp?docid=2009-061802-2317-99
http://telussecuritylabs.com/threats/show/TSL20090609-22
https://www.youtube.com/watch?v=-X51L07fk48
https://fe-ddis.dk/cfcs/CFCSDocuments/Zeroday.pdf
https://users.ece.cmu.edu/~tdumitra/public_documents/bilge12_zero_day.pdf

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.