Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Vulnerabilities / Threats

6/27/2017
05:44 PM
Connect Directly
Twitter
LinkedIn
RSS
E-Mail
50%
50%

Massive Skype Zero-Day Enables Remote Crashes

A security researcher uncovered a Skype vulnerability that could allow hackers to remotely execute code and crash software if exploited.

A critical vulnerability in Skype for Web could allow attackers to remotely execute code and crash systems. Microsoft has fixed the flaw, which remains a threat to anyone who has not updated their software.

Vulnerability Lab security researcher Benjamin Kunz Mejri discovered the zero-day vulnerability during a team conference call. It affects Skype versions 7.2, 7.35, and 7.36, and is considered a high-security risk with a 7.2 CVSS score.

Researchers state the stack buffer overflow flaw, CVE-2017-9948, has a "critical impact" to local and remote Skype users. Attackers can crash the software with a request to overwrite the register of the active software process. This lets them execute their own malicious code on affected and connected systems via Skype.

"The limitation of the transmitted size and count for images via print of the remote session clipboard has not secure limitation or restriction," Vulnerability Lab states. "Attackers are able to crash the software with one request to overwrite the eip register of the active software process."

This flaw affects the 'MSFTEDIT.DLL' dynamic link library of the Windows 8 (x86) operating system, researchers explain, and it is located in the "clipboard format" function of the Skype software. Attackers need only a low-privilege Skype account to launch a successful attack and do not need to interact with victims.

The vulnerability was reported to Microsoft's Security Response Center on May 16, and Microsoft issued a patch for the problem in Skype version 7.37 on June 8. Users are urged to update their software to avoid cyberattacks.

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
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Oldest First  |  Newest First  |  Threaded View
Commentary
What the FedEx Logo Taught Me About Cybersecurity
Matt Shea, Head of Federal @ MixMode,  6/4/2021
Edge-DRsplash-10-edge-articles
A View From Inside a Deception
Sara Peters, Senior Editor at Dark Reading,  6/2/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
The State of Cybersecurity Incident Response
In this report learn how enterprises are building their incident response teams and processes, how they research potential compromises, how they respond to new breaches, and what tools and processes they use to remediate problems and improve their cyber defenses for the future.
Flash Poll
How Enterprises are Developing Secure Applications
How Enterprises are Developing Secure Applications
Recent breaches of third-party apps are driving many organizations to think harder about the security of their off-the-shelf software as they continue to move left in secure software development practices.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-34682
PUBLISHED: 2021-06-12
Receita Federal IRPF 2021 1.7 allows a man-in-the-middle attack against the update feature.
CVE-2021-31811
PUBLISHED: 2021-06-12
In Apache PDFBox, a carefully crafted PDF file can trigger an OutOfMemory-Exception while loading the file. This issue affects Apache PDFBox version 2.0.23 and prior 2.0.x versions.
CVE-2021-31812
PUBLISHED: 2021-06-12
In Apache PDFBox, a carefully crafted PDF file can trigger an infinite loop while loading the file. This issue affects Apache PDFBox version 2.0.23 and prior 2.0.x versions.
CVE-2021-32552
PUBLISHED: 2021-06-12
It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the openjdk-16 package apport hooks, it could expose private data to other local users.
CVE-2021-32553
PUBLISHED: 2021-06-12
It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the openjdk-17 package apport hooks, it could expose private data to other local users.