CVE-2019-1204 Microsoft Outlook Elevation of Privilege Vulnerability

What is CVE-2019-1204?

CVE-2019-1204 is a medium-severity vulnerability in Microsoft Office, published on 14 Aug 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

An elevation of privilege vulnerability exists when Microsoft Outlook initiates processing of incoming messages without sufficient validation of the formatting of the messages. An attacker who successfully exploited the vulnerability could attempt to force Outlook to load a local or remote message store (over SMB). To exploit the vulnerability, the attacker could send a specially crafted email to a victim. Outlook would then attempt to open a pre-configured message store contained in the email upon receipt of the email. This update addresses the vulnerability by ensuring Office fully validates incoming email formatting before processing message content.

Weakness: CWE-20

Which versions are affected by CVE-2019-1204?

It affects 3 products.

Products include Microsoft Office, Microsoft Office 365 Proplus, Microsoft Outlook.

How do I fix CVE-2019-1204?

No fix has been published for CVE-2019-1204 yet. Limit exposure of the affected software until one is available.

Is CVE-2019-1204 being exploited?

There is no known exploitation of CVE-2019-1204 in the wild and no public exploit code.

Other vulnerabilities in Microsoft Office

• CVE-2018-0798 Microsoft Office Memory Corruption Exploited High 8.8
• CVE-2015-1770 Microsoft Office Uninitialized Memory Use Exploited High 8.8
• CVE-2006-2492 Microsoft Word Malformed Object Pointer Exploited High 8.8
• CVE-2018-0802 Microsoft Office Memory Corruption Exploited High 7.8
• CVE-2017-11882 Microsoft Office Memory Corruption Exploited High 7.8

All Microsoft Office vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-c2cv-vhh7-5wqr.