Zero-day vulnerability in Microsoft Excel

Memory corruption
CVE-2009-0238

Known malware:

TROJ_MDROPPER.XR (TrendMicro)
Exploit - MSExcel.r (McAfee)
Trojan.Mdropper.AC (Symantec)

Vulnerability details

Advisory: SB2009022301 - Remote code execution in Microsoft Excel

Vulnerable component: Microsoft Excel

CVE-ID: CVE-2009-0238

CVSSv3 score: CVSS:3.0/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 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Description:

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

The weakness exists due to boundary error when parsing the Excel spreadsheet file format. A remote attacker can create a specially crafted Excel file containing a malformed object, 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.

Note: this vulnerability was being actively exploited.

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