Tag Archives: microsoft

POODLE Bites SSL – WSWiR Episode 125

October Patch Bonanze, Leaky Apps, and POODLE

Cyber security has gone main stream, which means we’re getting a lot more security news each week than we used to. This week was even busier than usual, with updates fixing hundreds and hundreds of security vulnerabilities, as well as a significant vulnerabilities in a encryption standards. If you’re having trouble keeping track of the most important security info on your own, let our week video summary do it for you.

Today’s episode covers a ton of updates for October’s Patch Day, data leaks affecting SnapChat and DropBox, and a relatively serious SSL vulnerability called POODLE. The video is a bit longer than usual in order to better describe the POODLE flaw. Press play to learn more, and check the references for other interesting stories.

Enjoy your weekend, and beware what you click online.

(Episode Runtime: 16:37)

Direct YouTube Link: https://www.youtube.com/watch?v=AFX9DXDizu4

Episode References:

Extras:

— Corey Nachreiner, CISSP (@SecAdept)

Printer Doom Hack – WSWiR Episode 122

Apple Patches, Kindle XSS, and Doom Printer Hack

If you want to stay current with the Internet “threatscape,” our weekly video can help. It summarizes each week’s top information and network security news in one convenient place. Subscribe today!

Today’s episode covers, Apple and Adobe security updates, a cross-site scripting flaw that affects Kindle users, and an interesting printer hack that allowed an attacker to run doom on a printer. Watch the video for details and see the Reference section below for more info.

Enjoy your weekend!

(Episode Runtime: 5:39

Direct YouTube Link: https://www.youtube.com/watch?v=aZ7-LdlMYHc

Episode References:

Extras:

— Corey Nachreiner, CISSP (@SecAdept)

Windows 8.x and Server 2012 Suffer From Local EoP Vulnerability

Severity: Medium

Summary:

  • These vulnerabilities affect: Windows 8.x, Server 2012, and RT
  • How an attacker exploits it: By running a specially crafted application
  • Impact: A local low privileged attacker can gain SYSTEM privileges on your Windows computers
  • What to do: Deploy the appropriate update at your convenience, or let Windows Automatic Update do it for you

Exposure:

In a security bulletin released as part of Patch Day, Microsoft described an Elevation of Privilege (EoP) vulnerability that affects the latest versions of Windows—specifically, Windows 8.x, Server 2012, and RT.

The flaw lies in the Windows Task Scheduler, a service that allows you to automate the execution of tasks at certain times. Microsoft doesn’t describe the vulnerability in much detail, only saying the Task Scheduler does not properly check the integrity of tasks. By running a specially crafted application, an underprivileged local attacker could take advantage of this to execute programs with full SYSTEM privileges. Of course, the local attacker would have to log into a vulnerable system using valid credentials, which significantly lower the impact of this flaw.

Solution Path:

You should download, test, and deploy the appropriate Windows update immediately, or let Windows Automatic Update do it for you. You can find links to the updates in the “Affected and Non-Affected Software” section of Microsoft’s Windows security bulletin.

For All WatchGuard Users:

This is a local vulnerability. We recommend you install Microsoft’s updated to completely protect yourself from this flaw.

Status:

Microsoft has released patches to fix this vulnerability.

References:

This alert was researched and written by Corey Nachreiner, CISSP (@SecAdept).

Mega IE Update Corrects 37 Vulnerabilities; Including Zero Day

Summary:

  • These vulnerabilities affect: All current versions of Internet Explorer
  • How an attacker exploits it: By enticing one of your users to visit a web page containing malicious content
  • Impact: Various, in the worst case an attacker can execute code on your user’s computer, potentially gaining complete control of it
  • What to do: Deploy the appropriate Internet Explorer patches immediately, or let Windows Automatic Update do it for you

Exposure:

In a security bulletin released as part of Patch Day, Microsoft posted an update that fixes a 37 new vulnerabilities in all current versions of Internet Explorer (IE). Microsoft rates the aggregate severity of these new flaws as Critical.

All but one of the vulnerabilities described in this alert are memory corruption vulnerabilities, which share the same general scope and impact. If an attacker can lure you to a web page containing malicious web code, he can exploit these flaws to execute code on your computer, inheriting your privileges. If you have local administrative privileges, which most Windows users do, the attack could potentially gain full control of your computer.

These types of memory corruption vulnerabilities are ideal for attackers launching drive-by download attacks—a class of attack where malicious code hidden on a web page can silently install malware on your computer. Today’s attackers often hijack legitimate web pages and booby-trap them with malicious code. Typically, they do this via hosted web ads or through SQL injection and cross-site scripting (XSS) attacks. Even recognizable and authentic websites could pose a risk to your users if hijacked in this way. In fact, one of today’s fixes closes a zero day vulnerability that attackers have exploited in the wild. I highly recommend you install this update immediately

Solution Path:

You should download, test, and deploy the appropriate IE updates immediately, or let Windows Automatic Update do it for you. You can find links to the various IE updates in the “Affected and Non-Affected Software” section of Microsoft’s April IE security bulletin.

For All WatchGuard Users:

Good News! WatchGuard’s Gateway Antivirus and Intrusion Prevention services can often prevent these sorts of attacks, or the malware they try to distribute. For instance, our IPS signature team has developed signatures that can detect and block some of the memory corruption vulnerabilities described in Microsoft’s alert:

  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4095)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4094)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability -1 (CVE-2014-4092)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability -2 (CVE-2014-4092)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4089)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4082)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4081)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4086)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4087)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4088)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4084)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4065)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4080)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-2799)

Your XTM appliance should get this new IPS signature update shortly.

Furthermore, our Reputation Enabled Defense (RED) and WebBlocker services can often prevent your users from accidentally visiting malicious (or legitimate but booby-trapped) web sites that contain these sorts of attacks. Nonetheless, we still recommend you install Microsoft’s updates to completely protect yourself from all of these flaws.

Status:

Microsoft has released patches to fix these vulnerabilities.

References:

This alert was researched and written by Corey Nachreiner, CISSP (@SecAdept).

Microsoft Black Tuesday: Windows, IE, Lync, and .NET Patches

As you may know, today was Microsoft Patch Day. If you manage a Windows-based network, it’s time to get the latest updates.

According to Microsoft’s summary post, the Redmond-based software company released four security bulletins fixing 41 vulnerabilities in many of their popular products. The affected software includes, Windows, Internet Explorer (IE), Lync Server, and the .NET Framework. Microsoft rates the IE update as Critical, and the rest as Important.

As you might guess from the severity ratings, the IE update is the most important. It fixes over 37 security flaws in the popular browser, many of which attackers could use in drive-by download attacks (where just visiting a web site results in malware on your computer). Furthermore, one of the fixes closes a zero day vulnerability that attackers have exploited in the wild. If you use IE, I recommend you apply its update as quickly as your can. You should also install the other updates as well, however, their mitigating factors lessen their risk, so you can install them at your convenience.

In summary, if you use any of the affected products, download, test, and deploy these updates as quickly as you can or let Windows’ Automatic Update do it for you. For the server related updates, I highly recommend you test them before installing them on production servers, as Microsoft has released a few problem causing updates recently. You can find more information about these bulletins and updates in Microsoft’s September Summary advisory.

Also note today is Adobe’s Patch Day as well, and they released one security update fixing 12 vulnerabilities in Flash Player. If you use Flash, you should update it quickly. Adobe also pre-announced a Reader update earlier this month. However, it appears they have had to delay the update for some reason.

I’ll share more details about today’s patches on the blog throughout the day. However, I am traveling internationally, so the updates may not arrive as regularly as usual. If you are in a hurry to patch, I recommend you visit the links above, and start now.  — Corey Nachreiner, CISSP (@SecAdept).

Avoid MS14-045; Windows Kernel-mode Drivers Patch

Last week, I covered Microsoft Patch Day and recommend you install all the latest Windows, IE, Office, and server updates. This week, I need to warn you against one of those updates.

According to recent reports, the Windows kernel-mode driver update (MS14-045) is causing some computers to have blue screens of death (BSOD). If you haven’t installed this update yet, I recommend you avoid it until further notice. If you have installed it, and have suffered issues, Microsoft has shared instructions on how to remove it.

In the past, I’ve argued that Microsoft’s QA has gotten better, with fewer crash inducing updates. I guess they’re still not perfect. In general, this is a great example of why you should always test updates before pushing them into production. You can do this by maintaining a virtual version of your infrastructure and testing updates there.  — Corey Nachreiner, CISSP (@SecAdept)

SQL Server Update Fixes XSS and DoS Vulnerability

Severity: Medium

Summary:

  • These vulnerabilities affect: Most current versions of SQL Server
  • How an attacker exploits it: Various, including enticing someone to click a specially crafted link
  • Impact: In the worst case, an attacker can steal your web cookie, hijack your web session, or essentially take any action you could on the SQL server
  • What to do: Deploy the appropriate SQL Server updates as soon as possible

Exposure:

SQL Server is Microsoft’s popular database server. According to Microsoft’s security bulletin, SQL Server suffers from both a Cross-site Scripting (XSS) and Denial of Service (DoS) vulnerability.

The XSS flaw poses the most risk. The SQL Master Data Services (MDS) component suffers from a Cross-site Scripting (XSS) vulnerability due to its inability to properly encode output. By enticing someone to click a specially crafted link, an attacker could leverage this flaw to inject client-side script into that user’s web browser. This could allow the attacker to steal web cookie, hijack the web session, or essentially take any action that user could on your SQL Server’s associated web site. In some cases, attackers can even leverage XSS attacks to hijack your web browser, and gain unauthorized access to your computer.

The DoS flaw poses less risk, but is worth patching too. Essentially, if an attacker can send specially crafted queries to you SQL server, he could lock it up. However, since most administrator block SQL queries from the Internet, the attacker would have to reside on the local network to launch this attack.

Solution Path:

Microsoft has released SQL Server updates  to correct this vulnerability. You should download, test, and deploy the appropriate update as soon as possible. You can find the updates in the “Affected and Non-Affected Software” section of Microsoft’s SQL Server bulletin.

As an aside, the Cross-site Scripting (XSS) protection mechanisms built into many modern web browsers, like Internet Explorer (IE) 8 and above, can often prevent these sorts of attacks. We recommend you enable these mechanisms, if you haven’t already.

For All WatchGuard Users:

Since attackers might exploit some of these attacks locally, we recommend you download, test, and apply the SQL Server patches as quickly as possible.

Status:

Microsoft has released updates to fix this vulnerability.

References:

This alert was researched and written by Corey Nachreiner, CISSP (@SecAdept).


What did you think of this alert? Let us know at your.opinion.matters@watchguard.com.

Windows Updates for Media Center, .NET, and LRPC

Severity: Medium

Summary:

  • These vulnerabilities affect: All current versions of Windows (and related components like .NET Framework)
  • How an attacker exploits them: Multiple vectors of attack, such as enticing you into opening maliciously crafted Office file.
  • Impact: In the worst case, an remote attacker can gain complete control of your Windows computer
  • What to do: Install the appropriate Microsoft patches as soon as possible, or let Windows Automatic Update do it for you

Exposure:

Today, Microsoft released five security bulletins describing seven vulnerabilities in Windows and related components, such as the .NET Framework. A remote attacker could exploit the worst of these flaws to potentially gain complete control of your Windows PC. We recommend you download, test, and deploy these critical updates as quickly as possible.

The summary below lists the vulnerabilities, in order from highest to lowest severity.

  • MS14-043:  Windows Media Center Code Execution Flaw

Windows Media Center is the media player and Digital Video Recording (DVR) application that ships with the popular operating system. MCplayer.dll, a component Media Center uses for audio and video playback, suffers from a “use after free” vulnerability. By tricking you into running a specially crafted Office file, a remote attacker could leverage this flaw to execute code on your computer, with your privileges. If you’re a local adminstrator, the attacker could gain complete control of your machine. Note, this flaw mostly affects the latest versions of Windows.

Microsoft rating: Critical

  • MS14-045:  Multiple Kernel-Mode Driver Elevation of Privilege Vulnerabilities

The kernel is the core component of any computer operating system. Windows also ships with a kernel-mode device driver (win32k.sys), which handles the OS’s device interactions at a kernel level. The Windows kernel-mode driver suffers from three local code execution flaws. The flaws differ technically, but most have to do with the kernel-mode driver improperly handling certain objects, which can result in memory corruptions. Smart attackers can leverage memory corruption flaws to execute code. In a nutshell, if a local attacker can run a specially crafted application, he could leverage most of these flaws to gain complete control of your Windows computers. However, in order to run his malicious program, the attacker first needs to gain local access to your Windows computer, or needs to trick you into running the program yourself, which somewhat lessens the severity of this vulnerability.

Microsoft rating: Important

  • MS14-046:  .NET Framework ASLR Bypass Flaw

The .NET Framework is software framework used by developers to create new Windows and web applications. Address Space Layout Randomization (ASLR) is a memory obfuscation technique that some operating systems use to make it harder for attackers to find specific things in memory, which in turn makes it harder for them to exploit memory corruption flaws. In short, the .NET framework doesn’t use ASLR protection. This means attackers can leverage .NET to bypass Windows’ ASLR protection features. This flaw alone doesn’t allow an attacker to gain access to your Windows computer. Rather, it can help make other memory corruption vulnerabilities easier to exploit. This update fixes the ASLR bypass hole.

Microsoft rating: Important

Local Remote Procedure Call (LRPC) is a protocol Microsoft Windows uses to allow processes to communicate with each other and execute tasks, whether on the same computer or another computer over the network. It suffers from a ASLR bypass vulnerability that has the same scope and impact as the .NET one described above.

Microsoft rating: Important

  • MS14-049:  Windows Installer Service Elevation of Privilege Flaw

As its name suggests, the Windows Installer services is a component that helps you install and configure stuff in Windows. It suffers from a privilege escalation vulnerability involving the way it improperly handles the repair of a previous application. If a local attacker can log into one of your Windows systems and run a specially crafted application, he could exploit this flaw to gain complete control of the system (even if he started out with only Guest privileges). Of course, the attacker would need valid login credentials, which significantly lowers the severity of this issue.

Microsoft rating: Important

Solution Path:

Microsoft has released various updates that correct all of these vulnerabilities. You should download, test, and deploy the appropriate updates throughout your network immediately. If you choose, you can also let Windows Update automatically download and install them for you. As always, you should test your updates before deploying them.

The links below point directly to the “Affected and Non-Affected Software” section of each bulletin, where you can find links to the various updates:

For All WatchGuard Users:

Though WatchGuard’s XTM appliances offer defenses that can mitigate the risk of some of these flaws (such as blocking Office files), attackers can exploit others locally. Since your gateway XTM appliance can’t protect you against local attacks, we recommend you install Microsoft’s updates to completely protect yourself from these flaws.

Status:

Microsoft has released patches correcting these issues.

References:

This alert was researched and written by Corey Nachreiner, CISSP (@SecAdept).


What did you think of this alert? Let us know at your.opinion.matters@watchguard.com.

Latest IE Patch Corrects 26 Vulnerabilities

Summary:

  • These vulnerabilities affect: All current versions of Internet Explorer
  • How an attacker exploits it: By enticing one of your users to visit a web page containing malicious content
  • Impact: Various, in the worst case an attacker can execute code on your user’s computer, potentially gaining complete control of it
  • What to do: Deploy the appropriate Internet Explorer patches immediately, or let Windows Automatic Update do it for you

Exposure:

In a security bulletin released as part of Patch Day, Microsoft released an update that fixes a 26 new vulnerabilities in all current versions of Internet Explorer (IE). Microsoft rates the aggregate severity of these new flaws as Critical.

Most of the vulnerabilities described in this alert (24 of the 26) are memory corruption vulnerabilities, which share the same general scope and impact. If an attacker can lure you to a web page containing malicious web code, he can exploit these flaws to execute code on your computer, inheriting your privileges. If you have local administrative privileges, which most Windows users do, the attack could potentially gain full control of your computer

The patch also fixes a pair of privilege escalation vulnerabilities, but the memory corruption flaws alone should convince you to update IE as soon as you can.

Keep in mind, today’s attackers often hijack legitimate web pages and booby-trap them with malicious code. Typically, they do this via hosted web ads or through SQL injection and cross-site scripting (XSS) attacks. Even recognizable and authentic websites could pose a risk to your users if hijacked in this way, and the vulnerabilities described in today’s bulletin are perfect for use in drive-by download attacks.

Solution Path:

You should download, test, and deploy the appropriate IE updates immediately, or let Windows Automatic Update do it for you. You can find links to the various IE updates in the “Affected and Non-Affected Software” section of Microsoft’s April IE security bulletin.

For All WatchGuard Users:

Good News! WatchGuard’s Gateway Antivirus and Intrusion Prevention services can often prevent these sorts of attacks, or the malware they try to distribute. For instance, our IPS signature team has developed signatures that can detect and block some of the memory corruption vulnerabilities described in Microsoft’s alert:

  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4063)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4057)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-4050)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-2824)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-2823)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-2820)
  • WEB-CLIENT Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2014-2799)

Your XTM appliance should get this new IPS signature update shortly.

Furthermore, our Reputation Enabled Defense (RED) and WebBlocker services can often prevent your users from accidentally visiting malicious (or legitimate but booby-trapped) web sites that contain these sorts of attacks. Nonetheless, we still recommend you install Microsoft’s updates to completely protect yourself from all of these flaws.

Status:

Microsoft has released patches to fix these vulnerabilities.

References:

This alert was researched and written by Corey Nachreiner, CISSP (@SecAdept).

Nine Microsoft Security Bulletins Coming Tomorrow; Two Critical

Is it just me, or are the months flying by this year? It’s already time for yet another Microsoft Patch Day. According to their advanced notification post for August, Microsoft will release nine security bulletins tomorrow, two with a Critical severity rating. The bulletins will include updates to fix flaws in Windows, Internet Explorer, Office, the .NET Framework, SQL server, and other Microsoft Server Software. You can find a little more color about the upcoming patches at Microsoft’s Security Response Center blog.

In short, if you are a Microsoft administrator, you should prepare yourself for a busy day of patching. I’ll post more details about these updates tomorrow, as they come out. However, I am traveling this week to attend a show, so my posts may not go live as quickly as normal. Be sure to keep you eye on their summary post tomorrow, if you’d like to get the details early. — Corey Nachreiner, CISSP (@SecAdept)

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