Tag Archives: Patch

Dark times for Android: Examining Certifi-gate and the newest Stagefright updates

Certifi-gate and Stagefright are two recent threats that have put many Android devices at risk. Photo via Ars Technica.

When it comes to security, it seems that Android has seen better days. A slew of vulnerabilities and threats have been cropping up recently, putting multitudes of Android users at risk. Certifi-gate and Stagefright are two threats that, when left unprotected against, could spark major data breaches.

Certifi-gate leaches permissions from other apps to gain remote control access

Certifi-gate is a Trojan that affects Android’s operating system in a scary way. Android devices with Jelly Bean 4.3 or higher are affected by this vulnerability, making about 50% of all Android users vulnerable to attacks or to their personal information being compromised.

What’s frightening about this nasty bug is how easily it can execute an attack – Certifi-gate only requires Internet access in order to gain remote control access of your devices. The attack takes place in three steps:

  1. A user installs a vulnerable app that contains a remote access backdoor onto their Android device
  2. A remotely-controlled server takes control of this app by exploiting its insecure backdoor
  3. Using remote access, Certifi-gate obtains permissions from others apps that have previously been granted higher privileges (i.e. more permissions) by the user and uses them to exploit user data. A good example of an app targeted by Certifi-gate is TeamViewer, an app that allows you to control your Android device remotely.

The good news here is that Avast Mobile Security blocks the installation packages that make it possible for Certifi-gate to exploit the permissions of your other apps. Breaking this down further, Avast Mobile Security would block the package before the action in Step 2 is carried out, making it impossible for a remotely-controlled server to take control of an insecure app that contains a vulnerable remote access backdoor.

Google’s Stagefright patch can be bypassed

We’ve already told you about the Stagefright bug, which has exposed nearly 1 billion Android devices to malware. Whereas Certifi-gate uses Internet access to control your device, Stagefright merely needs a phone number in order to infect users.

Due to the scope and severity of this threat, Google quickly put out a security patch that was intended to resolve the Stagefright issue once and for all. Unfortunately, it hasn’t been fully successful — it’s possible for the patch to be bypassed, which leaves Android users with a false sense of security and a vulnerable device.

As Avast security researcher Filip Chytry explains in his original post examining Stagefright, Avast encourages users to disable the “auto retrieve MMS” feature within their default messaging app’s settings as a precautionary measure. You can read our full set of instructions for staying safe against Stagefright in the post.

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Microsoft releases emergency Windows patch after discovery of critical security flaw

With the release of their newest operating system just days away, now is not the most convenient time for Microsoft to be facing and dealing with security bugs. However, two thirds of all 1.5 billion PCs operated by Windows across the globe were recently left vulnerable due to a security flaw found in nearly every version of Windows, including Windows 10 Insider Preview.

If you use Windows, the time to update is now!

If you use Windows, the time to update is now!

The flaw (MS15-078) lies within the Windows Adobe Type Manager Library and can be exploited by cybercriminals to hijack PCs and/or infect them with malware. Users can be attacked when they visit untrusted websites that contain malicious embedded OpenType fonts. Microsoft explains more about the threat in a security bulletin advisory:

An attacker who successfully exploited this vulnerability could take complete control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

There are multiple ways an attacker could exploit this vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit an untrusted webpage that contains embedded OpenType fonts. The update addresses the vulnerability by correcting how the Windows Adobe Type Manager Library handles OpenType fonts.

The flaw has been classified as critical, which is Microsoft’s highest measured level of threat. Anyone running Windows Vista, Windows 7, Windows 8 and 8.1, Server 2008, Server 2012 and Windows RT are affected by the flaw. Microsoft’s online Security TechCenter includes a full list of affected software and additional vulnerability information.

How to ensure your safety

Taking into consideration that this is a critical security threat that potentially puts your whole system at risk, it only makes sense to install the Windows patch as quickly as possible. The majority of customers have automatic updating enabled and won’t need to take any action because the update will be downloaded and installed automatically. Customers who have not enabled automatic updating, or who install updates manually, can use the links in the Affected Software section to download and install the update. This article walks users through two different methods of obtaining and installing the security udpate. Both methods require a restart after the patch has been applied.

Avast Software Updater can lend a helping hand in ensuring that your software stays updated to the latest version. To find it, simply open your Avast user interface. Click Scan on the left side, then choose Scan for outdated software. You can then decide how to proceed.

Follow Avast on FacebookTwitterYouTube, and Google+ where we keep you updated on cybersecurity news every day.

Patch now: Microsoft Emergency Fix

Yesterday Microsoft released an emergency security update for all of the supported Windows version (this means Windows 7, Windows 8/8.1, Windows RT and apparently even the unreleased Windows 10). The patch is supposed to fix an exploit that would allow hackers to access another computer easily.  According to the company the flaw lies in the way the Windows Adobe Type Manager Library improperly handles specially crafted OpenType fonts.

“An attacker who successfully exploited this vulnerability could take complete control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights,” Microsoft says in their security bulletin. “There are multiple ways an attacker could exploit this vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit an untrusted webpage that contains embedded OpenType fonts. The update addresses the vulnerability by correcting how the Windows Adobe Type Manager Library handles OpenType fonts.“

Microsoft also says that while they had information that indicates that the issue was public there is no evidence that the vulnerability was used in any actual attack on customers.

The vulnerability itself was apparently found after going through loads of data from the Hacking Team email breach.

The post Patch now: Microsoft Emergency Fix appeared first on Avira Blog.

Samsung’s SW Update Says “NO” To Windows Update

Yup, I get annoyed by the Windows Update popup reminders as well. Still – updating is important and at the end of the day I am quite happy that there actually are updates to patch vulnerabilities and fix issues.  Which is why it is so shocking to find out that this time it’s not actual malware that is trying to disable it but a well know company: Samsung.

Microsoft MVP Patrick Barker discovered the issue when assisting a user with a Windows Update issue.  According to him “it was figured out eventually after using auditpol.exe and registry security auditing (shown below later) that the program that was responsible for disabling Windows Update was Disable_Windowsupdate.exe, which is part of Samsung’s SW Update software.”

Luckily the Samsung SW Update tool does not come with PCs by default: Users have to download it from Samsung’s website and install it. But let’s be honest: If you buy a new laptop you often download available tools in order to keep the system up to date as easy as possible. According to VentureBeat doing so is a common practice since there were people complaining about having an update problem before.

Now, Baker even got in touch with Samsung, whose support team had to say the following: “When you enable Windows updates, it will install the Default Drivers for all the hardware no laptop which may or may not work. For example if there is USB 3.0 on laptop, the ports may not work with the installation of updates. So to prevent this, SW Update tool will prevent the Windows updates.”

Well. Disabling the Windows Update does seem a very crass solution when it comes to making sure your updates and drivers will not break with new Windows updates …

The post Samsung’s SW Update Says “NO” To Windows Update appeared first on Avira Blog.

Fix for 600 Million Galaxy Phones Available Soon

You might have heard of the security issue with Galaxy phones that was everywhere in the media this week. If not, let me fill you in:

Samsung phones come preinstalled with SwiftKey, a very popular alternative keyboard for Android and iOS. Security researchers from NowSecure discovered a vulnerability in the update mechanism for the customized version the company uses and which is being distributed on most of the Galaxy phone models.

According to NowSecure „a remote attacker capable of controlling a user’s network traffic can manipulate the keyboard update mechanism on Samsung phones and execute code as a privileged (system) user on the target’s phone. This can be exploited in a a manner that requires no user interaction — a user does not have to explicitly choose to download a languagePack update to be exploited.“

Samsung itself played the issue down and stated that a “very specific set of conditions” needs to be met in order for the attack to be successful. Nonetheless a patch will be made available soon – after all more than 600 million Samsung Galaxy phones are affected. The drawback is that only devices that have Samsung’s Knox security platform installed will profit from the updates. “For the devices that don’t come with KNOX by default, we are currently working on an expedited firmware update that will be available upon completion of all testing and approvals” the company says in their statement.

The post Fix for 600 Million Galaxy Phones Available Soon appeared first on Avira Blog.

The mysterious OpenSSL vulnerability has been patched

All users of OpenSSL 1.0.2 should upgrade immediately to version 1.0.2a. In the advisory published on their website the OpenSSL vulnerability is called “ClientHello sigalgs DoS (CVE-2015-0291)”. If a client connects to an OpenSSL 1.0.2 server and renegotiates with an invalid signature algorithms extension, a NULL pointer dereference will occur. This can be exploited in a DoS attack against the server.

According to OpenSSL’s Security Policy, a “high severity issue”  includes issues affecting common configurations which are also likely to be exploitable. Examples include a server DoS (like this one), a significant leak of server memory (Heartbleed), and remote code execution.

OpenSSL promises that such issues “will be kept private and will trigger a new release of all supported versions”. They will attempt to keep the time these issues are private to a minimum, but the goal would be “no longer than a month” where this is something that can be controlled, and significantly quicker if there is a significant risk or we are aware the issue is being exploited.

The OpenSSL vulnerability has been reported on February 26th and the fix was released yesterday (March 19th), so well within the limit.

If this was no surprise, this advisory comes with something everyone was expecting: the FREAK vulnerability, which was initially categorized as “low severity”, has been reclassified as “high severity”. This was initially classified low because it was originally thought that servers with RSA export cipher suite support were rare: a client was only vulnerable to a MITM attack against a server which supports an RSA export cipher suite. Recent studies have shown that RSA export cipher suites support is far more common.

The patch comes also with fixes for a dozen or so vulnerabilities categorized as “moderate” and “low” severity.

Our recommendation is to update to version 1.0.2a immediately. Now that the vulnerability is public, it is to be expected that cybercriminals will try to exploit it.

The post The mysterious OpenSSL vulnerability has been patched appeared first on Avira Blog.

OpenSSL: Patch for secret “high severity” vulnerability

And indeed, in order to avoid being again in the news, the OpenSSL Foundation is set to release later this week several patches for OpenSSL, fixing undisclosed security vulnerabilities, including one that has been rated “high” severity.

Matt Caswell of the OpenSSL Project Team announced that OpenSSL versions 1.0.2a, 1.0.1m, 1.0.0r, and 0.9.8zf will be released Thursday.

“These releases will be made available on 19th March,” Caswell wrote. “They will fix a number of security defects. The highest severity defect fixed by these releases is classified as “high” severity.”

OpenSSL has been hit hard and the trust in it and in open source in general has been severely shaken in the last 12 months.

Last year in April, Heartbleed (CVE-2014-0160) was discovered in older versions of OpenSSL, but still highly used, which allowed hackers to read the sensitive contents of users’ encrypted data, such as financial transactions, instant messages and even steal SSL keys from Internet servers or client software that were running the affected versions of OpenSSL.

Two month later, in June the same year, a Man-in-the-Middle (MITM) vulnerability (CVE-2014-0224) was discovered and fixed. However, the vulnerability wasn’t quite as severe as the Heartbleed flaw, but serious enough to decrypt, read or manipulate the encrypted data.

In October last year, POODLE (CVE-2014-3566) (Padding Oracle On Downgraded Legacy Encryption) was discovered in the obsolete Secure Sockets Layer (SSL) v3.0 that could allow an attacker to decrypt contents of encrypted connections to websites. When exploited, it allows an attacker to perform a man-in-the-middle attack in order to decrypt HTTP cookies. The POODLE attack can force a connection to “fallback” to SSL 3.0, where it is then possible to steal cookies, which are meant to store personal data, website preferences or even passwords.

Just weeks ago, the latest vulnerability, FREAK (CVE-2015-0204)  (Factoring Attack on RSA-EXPORT Keys) was discovered in the SSL protocol that allowed an attacker to force SSL clients, including OpenSSL, to downgrade to weaken ciphers that can be easily broken. Needless to say that such a weak encryption could potentially allow them to eavesdrop on encrypted networks by conducting man-in-the-middle attacks. This time, pretty much every big software vendor was affected: Apple, with its MacOS, iPhone and iPad,  Google with Android and Chrome and last but not least, Microsoft with all versions of Windows.

Due to its widespread use, OpenSSL is considered an important software project and is ranked first under the Linux Foundation’s Core Infrastructure Initiative. Because of its complexity, high usage and lack of in-depth security reviews, companies like Google, Facebook and Cisco are heavily sponsoring this project in order to avoid being again affected by long forgotten bugs.

Well, for OpenSSL seems that this is starting to pay off.

The post OpenSSL: Patch for secret “high severity” vulnerability appeared first on Avira Blog.