Security Experts:

Connect with us

Hi, what are you looking for?



Microsoft Patches Windows Vulnerability Exploited in the Wild

Microsoft has released a dozen security bulletins to patch more than 50 vulnerabilities affecting Windows, Internet Explorer, Edge, Office, Lync, Exchange Server, .NET Framework, Exchange Server, and Skype for Business Server.

Microsoft has released a dozen security bulletins to patch more than 50 vulnerabilities affecting Windows, Internet Explorer, Edge, Office, Lync, Exchange Server, .NET Framework, Exchange Server, and Skype for Business Server.

The most important of the September 2015 bulletins is MS15-097, which addresses graphics component vulnerabilities that could allow remote code execution.

One of the flaws, a Win32k memory corruption issue that can be exploited for privilege escalation (CVE-2015-2546), has been exploited in the wild. The vulnerability affects all supported versions of Windows, including the latest Windows 10. Microsoft addressed this and three other Win32k memory corruption flaws by improving the way the Windows kernel-mode driver handles objects in memory.

According to Microsoft, there are four other vulnerabilities that have been disclosed publicly: a kernel ASLR bypass (CVE-2015-2529), a Windows Media Center RCE vulnerability (CVE-2015-2509), a .NET Framework integer overflow (CVE-2015-2504), and a memory corruption flaw in Edge and Internet Explorer (CVE-2015-2542).

The .NET integer overflow was disclosed in May by Dutch security firm Securify, but Microsoft hasn’t rushed to release a patch because the bug is difficult to exploit.

The Media Center vulnerability came to light earlier this year following the breach suffered by Italian spyware maker Hacking Team. A leaked email referencing the exploit revealed that an attacker can execute arbitrary code by getting the targeted user to open a specially crafted Media Center link (.mcl) file.

Trend Micro reported this vulnerability to Microsoft on July 18 after finding the Media Center exploit in the Hacking Team leak.

“The leaked data has been made available for over a month now, following the Hacking Team leaks, and cybercriminals may use this exploit for future attacks. We recommend users avoid opening any files with the .MCL file extension, especially from unverified sources,” Trend Micro said in a blog post.

Other critical security bulletins released by Microsoft on Tuesday patch vulnerabilities in Internet Explorer, Edge, Windows Journal, and Office.

Craig Young, researcher at Tripwire, has pointed out that the Edge bulletin fixes a smaller number of flaws compared to the Internet Explorer bulletin.

“This is likely a consequence of how proficient researchers have become with fuzzing IE and may change as researchers revamp their toolkits to target Windows 10 and specifically Edge,” Young told SecurityWeek.

The bulletins rated “important” address a denial-of-service (DoS) bug in Active Directory, privilege escalation flaws in the task manager, information disclosure and spoofing issues in Exchange Server, cross-site scripting (XSS) flaws in Lync Server and Skype for Business Server, and a Windows Hyper-V security feature bypass vulnerability.

Written By

Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

Join this webinar to learn best practices that organizations can use to improve both their resilience to new threats and their response times to incidents.


Join this live webinar as we explore the potential security threats that can arise when third parties are granted access to a sensitive data or systems.


Expert Insights

Related Content


Less than a week after announcing that it would suspended service indefinitely due to a conflict with an (at the time) unnamed security researcher...

Risk Management

The supply chain threat is directly linked to attack surface management, but the supply chain must be known and understood before it can be...


Apple has released updates for macOS, iOS and Safari and they all include a WebKit patch for a zero-day vulnerability tracked as CVE-2023-23529.


Patch Tuesday: Microsoft warns vulnerability (CVE-2023-23397) could lead to exploitation before an email is viewed in the Preview Pane.

Application Security

Drupal released updates that resolve four vulnerabilities in Drupal core and three plugins.

Cloud Security

VMware vRealize Log Insight vulnerability allows an unauthenticated attacker to take full control of a target system.

IoT Security

Lexmark warns of a remote code execution (RCE) vulnerability impacting over 120 printer models, for which PoC code has been published.

Application Security

A CSRF vulnerability in the source control management (SCM) service Kudu could be exploited to achieve remote code execution in multiple Azure services.