Vulnerabilities / Threats

1/9/2018
04:36 PM
Connect Directly
Twitter
LinkedIn
Google+
RSS
E-Mail
50%
50%

Microsoft Patches Exploited Office Bug

An Office memory corruption vulnerability is the only CVE reported as under active attack for this month's Patch Tuesday.

Microsoft today released its first wave of Patch Tuesday updates for 2018. This included fixes for a total of 56 CVEs affecting Microsoft Windows, Microsoft Office, Internet Explorer, Microsoft Edge, ChakraCore, ASP.NET, and the .NET Framework. One flaw has been exploited.

Of these 56 vulnerabilities, 16 were ranked Critical, 38 Important, one Moderate and one Low severity. Today's release includes guidance for mitigating speculative execution side-channel vulnerabilities following the news of Meltdown and Spectre attacks.

The exploited bug patched today, CVE-2018-0802, is a Critical remote code execution vulnerability in Microsoft Office that exists when software doesn't properly handle objects in memory. An attacker who successfully exploited this could run code in the context of the current user, which would let them install programs, view and edit data, or create new accounts with full user rights. It's more dangerous for victims with administrative rights.

Exploitation would require a user to open a specially crafted file with an affected version of Microsoft Office or WordPad. A threat actor could conduct a phishing attack by sending the file via email and convincing the target to open it. In a web-based attack, the attacker could host a website (or compromise a website) with a file to exploit the Office bug.

"No details of the attacks are provided by Microsoft, but the lack of industry discussion likely means this is being used in a targeted attack," writes Dustin Childs of Trend Micro's Zero Day Initiative Communications. There are multiple Office flaws patched this month, all of which Childs says "should also be given a high deployment priority."

In its exploitability assessment, Microsoft reports CVE-2018-0802 has been exploited in the wild. It states that at the time of publication, exploitation is unlikely for both its latest software release and older software release. Affected versions range from Microsoft Office 2007 Service Pack 3 to Microsoft Word 2016, 64-bit edition.

Read more details on CVE-2018-0802, including all affected versions of Office, here.

Related Content:

Kelly Sheridan is the Staff Editor at Dark Reading, where she focuses on cybersecurity news and analysis. She is a business technology journalist who previously reported for InformationWeek, where she covered Microsoft, and Insurance & Technology, where she covered financial ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
White House Cybersecurity Strategy at a Crossroads
Kelly Jackson Higgins, Executive Editor at Dark Reading,  7/17/2018
The Fundamental Flaw in Security Awareness Programs
Ira Winkler, CISSP, President, Secure Mentem,  7/19/2018
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2018-14492
PUBLISHED: 2018-07-21
Tenda AC7 through V15.03.06.44_CN, AC9 through V15.03.05.19(6318)_CN, and AC10 through V15.03.06.23_CN devices have a Stack-based Buffer Overflow via a long limitSpeed or limitSpeedup parameter to an unspecified /goform URI.
CVE-2018-3770
PUBLISHED: 2018-07-20
A path traversal exists in markdown-pdf version <9.0.0 that allows a user to insert a malicious html code that can result in reading the local files.
CVE-2018-3771
PUBLISHED: 2018-07-20
An XSS in statics-server <= 0.0.9 can be used via injected iframe in the filename when statics-server displays directory index in the browser.
CVE-2018-5065
PUBLISHED: 2018-07-20
Adobe Acrobat and Reader 2018.011.20040 and earlier, 2017.011.30080 and earlier, and 2015.006.30418 and earlier versions have a Use-after-free vulnerability. Successful exploitation could lead to arbitrary code execution in the context of the current user.
CVE-2018-5066
PUBLISHED: 2018-07-20
Adobe Acrobat and Reader 2018.011.20040 and earlier, 2017.011.30080 and earlier, and 2015.006.30418 and earlier versions have an Out-of-bounds read vulnerability. Successful exploitation could lead to information disclosure.