Vulnerability Spotlight: Code execution vulnerability in Microsoft Excel
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2020-0901 | A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory. A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Excel. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) containing a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file. The security update addresses the vulnerability by correcting how Microsoft Excel handles objects in memory. NVD description · AI analysis pending | 9.8 | 4% |
| — |
Full article253 words · extracted from blog.talosintelligence.com · click to collapse
Tuesday, May 12, 2020 15:05
Cisco Talos recently discovered a code execution vulnerability in some versions of Microsoft Excel. An attacker could exploit this vulnerability by tricking the victim into opening a specially crafted Excel file,
triggering a use-after-free condition and allowing them to execute remote code on the victim machine.
Microsoft disclosed and patched this bug as part of their monthly security update Tuesday. For more on their updates, read the full blog here.
In accordance with our coordinated disclosure policy, Cisco Talos worked with Microsoft to ensure that these issues are resolved and that an update is available for affected customers.
Vulnerability details
Microsoft Office Excel s_Schema code execution vulnerability (TALOS-2020-1015/CVE-2020-0901)
An exploitable code execution vulnerability exists in the Excel s_Schema functionality of Microsoft Office 2001, build 12430.20264 and Microsoft Office 365 ProPlus x86 - version 1908, build 11929.20606. A specially crafted malformed file can cause a use-after-free resulting in remote code execution. An attacker can provide a malicious file to trigger this vulnerability.
Read the complete vulnerability advisory here for additional information.
Versions tested
Talos tested and confirmed that this vulnerability affects Microsoft Excel for Microsoft Office 2001, build 12430.20264 and Office 365 ProPlus x86, version 1908, build 11929.20606.
Coverage
The following SNORTⓇ rules will detect exploitation attempts. Note that additional rules may be released at a future date and current rules are subject to change pending additional vulnerability information. For the most current rule information, please refer to your Firepower Management Center or Snort.org.
Snort Rules: 53268, 53269
Text extracted automatically; images, tables and formatting may be missing. Original: https://blog.talosintelligence.com/vuln-spotlight-excel-patch-tuesday-may-2020/