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
Newest First  |  Oldest First  |  Threaded View
When It Comes To Security Tools, More Isn't More
Lamont Orange, Chief Information Security Officer at Netskope,  1/11/2021
US Capitol Attack a Wake-up Call for the Integration of Physical & IT Security
Seth Rosenblatt, Contributing Writer,  1/11/2021
IoT Vendor Ubiquiti Suffers Data Breach
Dark Reading Staff 1/11/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
2020: The Year in Security
Download this Tech Digest for a look at the biggest security stories that - so far - have shaped a very strange and stressful year.
Flash Poll
Assessing Cybersecurity Risk in Today's Enterprises
Assessing Cybersecurity Risk in Today's Enterprises
COVID-19 has created a new IT paradigm in the enterprise -- and a new level of cybersecurity risk. This report offers a look at how enterprises are assessing and managing cyber-risk under the new normal.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-3113
PUBLISHED: 2021-01-17
Netsia SEBA+ through 0.16.1 build 70-e669dcd7 allows remote attackers to discover session cookies via a direct /session/list/allActiveSession request. For example, the attacker can discover the admin's cookie if the admin account happens to be logged in when the allActiveSession request occurs, and ...
CVE-2020-25533
PUBLISHED: 2021-01-15
An issue was discovered in Malwarebytes before 4.0 on macOS. A malicious application was able to perform a privileged action within the Malwarebytes launch daemon. The privileged service improperly validated XPC connections by relying on the PID instead of the audit token. An attacker can construct ...
CVE-2021-3162
PUBLISHED: 2021-01-15
Docker Desktop Community before 2.5.0.0 on macOS mishandles certificate checking, leading to local privilege escalation.
CVE-2021-21242
PUBLISHED: 2021-01-15
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is a critical vulnerability which can lead to pre-auth remote code execution. AttachmentUploadServlet deserializes untrusted data from the `Attachment-Support` header. This Servlet does not enforce any authentication or a...
CVE-2021-21245
PUBLISHED: 2021-01-15
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, AttachmentUploadServlet also saves user controlled data (`request.getInputStream()`) to a user specified location (`request.getHeader("File-Name")`). This issue may lead to arbitrary file upload which can be used to u...