Posts tagged ‘Exploits’

Mozilla Foundation fixes 2 vulnerabilities in Firefox

ff_3The developers of the Mozilla Foundation just released Firefox 3.5.2 to close two critical rated security vulnerabilities. One flaw in the web browser could be abused to spoof certificates for web servers. This could happen as the browser didn’t parse the domain name in the certificate correctly and would stop parsing at a NULL sign. A CA would issue a certificate for <domainname><0×00><mydomainname> and the certificate would be valid for <domainname>, thus allowing for a hidden man-in-the-middle attack.

The second vulnerability could get abused to inject malicious code – for example a Trojan – into the victim’s computer by putting certain regular expressions into a certificate for SSL communication. This happened due to code that was meant to provide backwards compatibility to the non-standard regular expression syntax used by Netscape clients and servers. Now Firefox uses the current industry-standard wild-card syntax.

Update your Firefox as soon as possible by clicking on the Help menu and choosing “Search for Updates”. As other Mozilla products like Thunderbird and SeaMonkey are vulnerable too, apply updates ASAP as well when they get available.

Dirk Knop
Technical Editor

Adobe-Patches are out

acrobat_logoAs announced, Adobe released the first updates for the critical security vulnerabilities in its products already. The first update is for Adobe Flash-Player – the new version 10.0.32.18 is supposed to close the security hole in the software. You can get it via Adobes web site.

During the day, Adobe wants to release further patches for Adobe Reader and Acrobat. Also, a new version of the Shockwave-Player is already available. Please install the updated versions as soon as possible.

Let me thank all the hardworking administrators out there at this place, especially the Avira admins. They have to roll out all these updates today and already had a busy week due to Microsoft’s out-of-band updates from Tuesday. Don’t forget, it’s System Administrator Appreciation day!

Dirk Knop
Technical Editor

Avira Risk Level

The Risk Level describes the current phishing- and malware threats that we receive in real time from our sources in Internet. These threats are valid and can be accessed by any user in the Internet.

The levels are computed by comparing the amount of threats (malware and phishing separately) received in the last 24 h (called 24h threat value) to the average value from the last 30 days (called average threat value). These levels are computed every 15 minutes.

This is how the graphs with the values per day for the last 30 days looks like:

Fig. 1: Statistics per day, last 30 days

Fig. 1: Statistics per day, last 30 days

The graph with the values per hour for the last 24h:

Fig. 2: Statistics per hour, last 24h

Fig. 2: Statistics per hour, last 24h

Level 1 – Normal (Green)

Risk: Low – there is much less activity than the average we have seen in the last 30 days. This condition corresponds to no discernible malicious activity for the type of threat for which the risk level is issued. The Avira products should function and should be updated using the default settings.

Level 2 – Average (Yellow-Green)

Risk: Low to Moderate - there is relatively less activity than the average we have seen in the last 30 days. This condition corresponds to some malicious activity for the type of threat for which the risk level is issued. The Avira products should function and should be updated using the default settings. This risk level is usually “the calm before the storm”, so we advise our customers to keep an eye on our website for information and updates.

Level 3 – Suspicious (Yellow)

Risk: Moderate – there is the same activity as the average we have seen in the last 30 days. This condition corresponds to clear signs of malicious activity for the type of threat for which the risk level is issued. The Avira products should function with heuristics and generic settings enabled because it might be possible that there is a new variant of a known malware. This risk level means that some unknown malware might be starting to spread, so we advise our customers to keep an eye on our website for information and updates. Please keep the logfiles of the security products under careful observation.

Level 4 – Alert (Orange)

Risk: High – there is the more activity than the average we have seen in the last 30 days. This condition corresponds to known malicious activity for the type of threat for which the risk level is issued. The Avira products must be updated more often than the default. Do not forget to update both the signatures and the engine. This risk level means that known malware are spreading, and we strongly advise to keep the logfiles of the security products under careful observation.

Level 5 – Outbreak (Red)

Risk: Very High – there is much more activity than the average we have seen in the last 30 days. This condition corresponds to known malicious activity for the type of threat for which the risk level is issued. The Avira products must be updated more often than the default. Do not forget to update the signatures, the engine and the products. This risk level means that known malware are currently active, creating a severe risk to the infrastructure and normal operations. We strongly advise to keep the logfiles of the security products under careful observation.

Sorin Mustaca
Manager International Software Development

Out-of-band Patches from Microsoft II

ie_7As announced last week, Microsoft released two security bulletins out-of-band. They cope with critical vulnerabilities in all Internet Explorer Versions and with a flawed Active Template Library (ATL) for developers using Microsoft’s Visual Studio.

Due to the flaw in the ATL – which gets used to build ActiveX controls for example – it is possible to bypass the kill bit restrictions within the Internet Explorer (IE). Manipulated Websites thus can call ActiveX modules with security vulnerabilities and inject malware on affected computers. Microsoft now closes three security holes in IE and hardens it against abuse of the flaws introduced by the ATL.

The error is based on flaws within the ATL of Visual Studio. Thus components build with this development environment can be affected, too. Cisco for example released a security advisory and announces workarounds and updates for the Cisco Unity software. Expect other software developers to release updates soon, too.

Interestingly, according to Microsoft’s Security Bulletins, Windows 7 is not affected by these vulnerabilities.

Install the updates as soon as possible, and if you are a developer, rebuild your components with the new ATL. A knowledge-base article from Microsoft explains the issue for developers.

Dirk Knop
Technical Editor

Out-of-band Patches from Microsoft

malware_warningMicrosoft announced extraordinary updates for the Internet Explorer and for Visual Studio for this Tuesday to come. While the company rates the security issue in Visual Studio only as moderate, the IE-flaws – which also affect IE8 – are considered critical and allow for remote code execution.

Prepare for those updates as they are really critical and necessary if Microsoft decides to do an out-of-band release. Install them ASAP when available.

Dirk Knop
Technical Editor

Security flaw in Adobe PDF/Flash

acrobat_logoThere are security flaws within Adobe Reader and Acrobat and the Adobe Flash Player which are getting actively exploited on the net currently. The company has published a security advisory where it announces that they are currently investigating the problem and plan an update for the 30th of July.

Avira antivirus solutions already detect the malicious PDF files as EXP/Pidief.TH and the dropped malware by those documents as TR/Drop.Wmach and TR/Spy.WMach, respectively. Anyhow it is a good idea to take additional security measures until Adobe provides an update.

Adobe recommends to delete or rename the file authplay.dll that ships with the Reader and with Acrobat. Also, enabling Data Execution Prevention (DEP) and activating the User Access Control (UAC) in Windows Vista shall mitigate the risk according to Adobe.

Another solution would be using a different PDF reader and disabling Adobe PDF and Flash within the web browser via its add-ons-manager. The NoScript extension for Firefox also helps preventing Flash applications to run in the browser; it is possible that drive-by-downloads via malicious Flash applications embedded in web sites turn up soon.

Dirk Knop
Technical Editor

Firefox 3.5.1 closes security hole

ff_3The Mozilla Foundation released Firefox 3.5.1 today. The new version fixes an issue which could get abused by web sites to inject malicious code into a victim’s computer. The vulnerability was in the Just-In-Time compiler for JavaScript which is a new feature in Firefox 3.5. Please update your Firefox to the most recent version by clicking on “Help” and selecting “Search for updates” now.

Dirk Knop
Technical Editor

6 Patches from Microsoft; Vulnerability in Firefox 3.5

malware_warningMicrosoft released 6 security bulletins as announced. The actively exploited security hole in a video ActiveX component gets fixed by the updates, also flaws in DirectShow, the Embedded OpenType Font Engine, VirtualPC and -Server, ISA Server and Office 2007. A fix for the recently discovered vulnerability in Office, ISA Server 2004 and 2006 which also gets exploited on the net already is still missing though – so please apply the workarounds described in Microsofts security advisory or use the provided Fix-it-tool.

Microsoft expects exploits for all fixed vulnerabilities within the next 30 days according to the Exploitability Index of the security bulletin summary. The patches should be applied as soon as possible therefore to protect the own computer and/or network.

Firefox 3 Logo

The Mozilla Foundation issued a warning of a security hole in the Just-in-time compiler for JavaScript of the new Firefox 3.5 web browser. As exploit code is already publicly available they recommend to turn of the compiler temporarily. From the security advisory:

  1. Enter about:config in the browser’s location bar.
  2. Type jit in the Filter box at the top of the config editor.
  3. Double-click the line containing javascript.options.jit.content setting the value to false.

The developers are currently working on a fix. Until then it is a good idea to implement the described workaround.

Dirk Knop
Technical Editor

New Office vulnerability actively exploited

malware_warningMicrosoft has warned about yet another security hole which already gets actively exploited on the net. Affected are installations of Microsofts Office XP and 2003, the ISA Server 2004 and 2006 and Office Small Business Accounting 2006.

It is unclear whether the updates which are to be released later today will already fix the error, but it seems unlikely. Microsoft has a “Fix-it” tool ready which disables the ActiveX component within Internet Explorer to help mitigate the risk. Please use it ASAP!

Dirk Knop
Technical Editor

Microsoft announces July Patches

According to Microsofts announcement of the next Black Tuesday the company plans to release six security bulletins. Three of those are dealing with security holes deemed critical by Microsoft, while the other three are only rated “important”.

Among those three critical vulnerabilities there is one in DirectX. It seems that the Redmond company plugs the holes which are currently attacked in the wild. We detect the JavaScript used to exploit the vulnerability generically up to all currently known versions as “HTML/Shellcode.Gen”. Halvar Flake has a nice writeup in his blog with details of the flaw and shows “how deep the rabbit hole really goes”.

While it stays unclear what the other two Windows vulnerabilities are, there will be updates which wipe out the important security flaws within Publisher from Microsofts Office suite, within VirtualPC and Virtual Server and in the ISA Server. Two of the updates will require a restart, so prepare for some downtime next Tuesday!

Dirk Knop
Technical Editor