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Vulnerability in Internet Explorer Could Allow Remote Code

  1. #1


    Posts : 22,582
    64-bit Windows 10

    Vulnerability in Internet Explorer Could Allow Remote Code


    Microsoft Security Advisory (2887505)

    Vulnerability in Internet Explorer Could Allow Remote Code Execution

    Published: Tuesday, September 17, 2013
    Version: 1.0

    General Information

    Executive Summary

    Microsoft is investigating public reports of a vulnerability in all supported versions of Internet Explorer. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability in Internet Explorer 8 and Internet Explorer 9. Applying the Microsoft Fix it solution, "CVE-2013-3893 MSHTML Shim Workaround," prevents the exploitation of this issue. See the Suggested Actions section of this advisory for more information.

    The vulnerability is a remote code execution vulnerability. The vulnerability exists in the way that Internet Explorer accesses an object in memory that has been deleted or has not been properly allocated. The vulnerability may corrupt memory in a way that could allow an attacker to execute arbitrary code in the context of the current user within Internet Explorer. An attacker could host a specially crafted website that is designed to exploit this vulnerability through Internet Explorer and then convince a user to view the website.

    On completion of this investigation, Microsoft will take the appropriate action to protect our customers, which may include providing a solution through our monthly security update release process, or an out-of-cycle security update, depending on customer needs.

    We are actively working with partners in our Microsoft Active Protections Program (MAPP) to provide information that they can use to provide broader protections to customers. In addition, we are actively working with partners to monitor the threat landscape and take action against malicious sites that attempt to exploit this vulnerability.

    Microsoft continues to encourage customers to follow the guidance in the Microsoft Safety & Security Center of enabling a firewall, applying all software updates, and installing antimalware software.


    Mitigating Factors:

    • By default, Internet Explorer on Windows Server 2003, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates this vulnerability.
    • By default, all supported versions of Microsoft Outlook, Microsoft Outlook Express, and Windows Mail open HTML email messages in the Restricted sites zone. The Restricted sites zone, which disables script and ActiveX controls, helps reduce the risk of an attacker being able to use this vulnerability to execute malicious code. If a user clicks a link in an email message, the user could still be vulnerable to exploitation of this vulnerability through the web-based attack scenario.
    • An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
    • In a web-based attack scenario, an attacker could host a website that contains a webpage that is used to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these websites. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes users to the attacker's website.

    Recommendation. Please see the Suggested Actions section of this advisory for more information.
    Source: Microsoft Security Advisory (2887505): Vulnerability in Internet Explorer Could Allow Remote Code Execution
    Last edited by Brink; 19 Sep 2013 at 12:54.

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  2. #2

    Microsoft Launches Emergency Patch for Internet Explorer


    Microsoft has just released a new security update for Internet Explorer in order to patch a flaw affecting all versions of the company’s in-house browser, including IE11 on Windows 8.1 RTM.

    While Microsoft claims that it has received reports of attacks aimed at Internet Explorer 8 and 9, it appears that the security flaw affects all the other versions of the browser.

    According to the company, the issue would allow remote code execution, which means that an attacker could get access to an unpatched system by directing users to a compromised website.

    “This issue could allow remote code execution if an affected system browses to a website containing malicious content directed towards the specific browser type. This would typically occur when an attacker compromises the security of trusted websites regularly frequented, or convinces someone to click on a link in an email or instant message,” the company explained.
    Microsoft Launches Emergency Patch for Internet Explorer
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  3. #3


    More Details on Internet Explorer 0-Day Flaw Emerge

    “The attacker exploits the vulnerability by setting up a malicious webpage which uses JavaScript code to prepare a user-after-free condition, where previously allocated memory, whose content the attacker can control, is accessed after it has been marked as not used anymore,” Kandek explained.

    “The exploit depends on a Microsoft Office DLL which has been compiled without Adress Space Layout Randomization (ALSR) to locate the right memory segment to attack, but this DLL is extremely common and most likely will not lower the affected population by much.”
    More Details on Internet Explorer 0-Day Flaw Emerge
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  4. #4


    Posts : 142
    Win 7 Pro x64


    Hasn't every version of IE since v1 had the same problem?
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