Risk
11/10/2010
01:28 PM
50%
50%

Microsoft Patches DLL Hijacking Vulnerability

One of the bugs could hijack a PC if a user simply previewed an email with a malicious Word, Excel, or PowerPoint file attached.

Microsoft Office 2010 In Pictures
(click image to view slideshow)
Slideshow: Microsoft Office 2010 In Pictures

Microsoft on Tuesday released patches for 11 vulnerabilities, including DLL preloading or hijacking (aka binary planting) flaws in Microsoft Word, Excel, and PowerPoint 2010 for Windows. Attackers could exploit the Office DLL preloading bugs to execute arbitrary code on a PC.

Application security firm ACROS Security, which discovered the DLL preloading flaws, alerted Microsoft and then waited until Tuesday to publicly detail its findings.

According to ACROS, the Office DLL flaws stem from "incorrect dynamic link library loading," through which "an attacker can cause her malicious DLL to be loaded and executed from local drives, remote Windows shares, and even shares located on Internet."

The attack works if an attacker plants a malicious DLL with a specific name -- such as pptimpconv.dll -- on a network share, then tricks a user into opening a malicious DOCX, XLSX, or PPTX file that requests the DLL. "Once the user opens the file, Office's library mso.dll makes an unsafe call to LoadLibrary ("pptimpconv.dll"). As this DLL is not present on the system, its malicious version gets loaded from the current working directory," said ACROS.

ACROS also warned that "Windows systems by default have the Web Client service running -- which makes remote network shares accessible via WebDAV, thus the malicious DLL can also be deployed from an Internet-based network share as long as the intermediate firewalls allow outbound HTTP traffic to the Internet."

Also on Tuesday, Microsoft patched Office against a remote-code-execution vulnerability, rated "critical" by Symantec, that affects Office 2007 and 2010 for Windows. Using a specially crafted RTF file, an attacker could exploit the vulnerability, via Outlook, to run arbitrary code. The attacker would only have to email the malicious RTF file as an attachment. Even if only previewed -- not opened -- by the recipient, the malicious code would execute automatically, allowing the attacker to exploit the PC.

Several of the vulnerabilities disclosed Tuesday by Microsoft also affect Microsoft Office for Mac products. While Microsoft did patch Microsoft Office for Mac 2011, in its Tuesday security bulletin, it noted that "the security updates for Microsoft Office 2004 for Mac, Microsoft Office 2008 for Mac, and Open XML File Format Converter for Mac are unavailable at this time." The company has not yet disclosed when it will release the outstanding Mac updates.

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: "I've seen worse.  Last week Tim had a dragon."
Current Issue
Security Operations and IT Operations: Finding the Path to Collaboration
A wide gulf has emerged between SOC and NOC teams that's keeping both of them from assuring the confidentiality, integrity, and availability of IT systems. Here's how experts think it should be bridged.
Flash Poll
New Best Practices for Secure App Development
New Best Practices for Secure App Development
The transition from DevOps to SecDevOps is combining with the move toward cloud computing to create new challenges - and new opportunities - for the information security team. Download this report, to learn about the new best practices for secure application development.
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2017-0290
Published: 2017-05-09
NScript in mpengine in Microsoft Malware Protection Engine with Engine Version before 1.1.13704.0, as used in Windows Defender and other products, allows remote attackers to execute arbitrary code or cause a denial of service (type confusion and application crash) via crafted JavaScript code within ...

CVE-2016-10369
Published: 2017-05-08
unixsocket.c in lxterminal through 0.3.0 insecurely uses /tmp for a socket file, allowing a local user to cause a denial of service (preventing terminal launch), or possibly have other impact (bypassing terminal access control).

CVE-2016-8202
Published: 2017-05-08
A privilege escalation vulnerability in Brocade Fibre Channel SAN products running Brocade Fabric OS (FOS) releases earlier than v7.4.1d and v8.0.1b could allow an authenticated attacker to elevate the privileges of user accounts accessing the system via command line interface. With affected version...

CVE-2016-8209
Published: 2017-05-08
Improper checks for unusual or exceptional conditions in Brocade NetIron 05.8.00 and later releases up to and including 06.1.00, when the Management Module is continuously scanned on port 22, may allow attackers to cause a denial of service (crash and reload) of the management module.

CVE-2017-0890
Published: 2017-05-08
Nextcloud Server before 11.0.3 is vulnerable to an inadequate escaping leading to a XSS vulnerability in the search module. To be exploitable a user has to write or paste malicious content into the search dialogue.

Dark Reading Radio
Archived Dark Reading Radio
In past years, security researchers have discovered ways to hack cars, medical devices, automated teller machines, and many other targets. Dark Reading Executive Editor Kelly Jackson Higgins hosts researcher Samy Kamkar and Levi Gundert, vice president of threat intelligence at Recorded Future, to discuss some of 2016's most unusual and creative hacks by white hats, and what these new vulnerabilities might mean for the coming year.