Vulnerability · Published Aug 17, 2020 · Assigned by microsoft
CVE-2020-1493Microsoft Outlook Information Disclosure Vulnerability
Medium 5.5
In plain English
A medium-severity security flaw in Microsoft 365 Apps for Enterprise from Microsoft. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 7.3% (higher than 94% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
An information disclosure vulnerability exists when attaching files to Outlook messages. This vulnerability could potentially allow users to share attached files such that they are accessible by anonymous users where they should be restricted to specific users. To exploit this vulnerability, an attacker would have to attach a file as a link to an email. The email could then be shared with individuals that should not have access to the files, ignoring the default organizational setting. The security update addresses the vulnerability by correcting how Outlook handles file attachment links.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Office 2019 | 19.0.0 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 – before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Outlook 2016 | 16.0.0.0 – before publication |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 | 15.0.0.0 – before publication |
| Microsoft | Microsoft Outlook 2010 Service Pack 2 | 13.0.0.0 – before publication |
Weakness: CWE-922 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N