Memory Corruption in Microsoft Office Excel Products by Microsoft
CVE-2009-3129

7.8HIGH

Key Information:

Vendor
Microsoft
Status
Open Xml File Format Converter
Office
Excel
Excel Viewer
Vendor
CVE Published:
11 November 2009

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 89%🦅 CISA Reported

Summary

This vulnerability occurs when Microsoft Office Excel fails to properly handle a FEATHEADER record with an invalid cbHdrData size element. An attacker can exploit this flaw through a specially crafted spreadsheet, leading to arbitrary code execution. The affected versions include several iterations of Microsoft Excel and its associated viewer and compatibility pack, making it crucial for users to apply relevant updates to mitigate potential risks.

CISA Reported

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply updates per vendor instructions.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2009-3129 - Proof of Concept

References

http://osvdb.org/59860
vdb-entryx_refsource_OSVDB
https://oval.cisecurity.org/repository/search/definition/...
vdb-entrysignaturex_refsource_OVAL
http://www.securitytracker.com/id?1023157
vdb-entryx_refsource_SECTRACK

EPSS Score

89% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • 🦅

    CISA Reported

  • 🟡

    Public PoC available

  • Vulnerability published

  • Vulnerability Reserved

.