Risk
11/8/2010
11:59 AM
George V. Hulme
George V. Hulme
Commentary
50%
50%

Microsoft Internet Explorer Zero-Day Under Attack

The risk surrounding a new zero-day Microsoft Internet Explorer vulnerability increased significantly over the weekend and could prompt an emergency patch release from the software company at any time.

The risk surrounding a new zero-day Microsoft Internet Explorer vulnerability increased significantly over the weekend and could prompt an emergency patch release from the software company at any time.On November 3, Microsoft warned customers of limited attacks against a new Internet Explorer vulnerability. Using the flaw detailed below by the company, attackers can target Internet Explorer 6, 7, and 8 while Internet Explorer 9 is not affected:

Internet Explorer incorrectly under-allocates memory to store a certain combination of Cascading Style Sheets (CSS) tags when parsing HTML. This could result in an overwrite of the least significant byte of a vtable pointer. An attacker able to spray memory with a specific pattern could potentially execute code in the context of the process parsing the HTML. The defense against heap spray style attacks is Data Execution Prevention (DEP).

DEP is enabled by default in Internet Explorer 8, and users should consider enabling it in earlier versions.

Users of Internet Explorer might want to do so quickly, as security researcher Roger Thompson noted in his blog that attack software for this vulnerability has been incorporated in the Eleonore Exploit Kit saying that "This raises the stakes considerably, as it means that anyone can buy the kit for a few hundred bucks, and they have a working 0-day."

Microsoft is due to release its scheduled monthly batch of security patches tomorrow, but don't expect this Internet Explorer flaw to be one of them. Microsoft has said it will release a critical flaw in multiple versions of its Microsoft Office suite as well as a fix for its Forefront Unified Access Gateway.

The good news here is that this month administrators won't have to contend with anything near the whopping 49 vulnerabilities last month.

For my security and technology observations throughout the day, find me on Twitter.

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Cartoon
Current Issue
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2015-5084
Published: 2015-08-02
The Siemens SIMATIC WinCC Sm@rtClient and Sm@rtClient Lite applications before 01.00.01.00 for Android do not properly store passwords, which allows physically approximate attackers to obtain sensitive information via unspecified vectors.

CVE-2015-5352
Published: 2015-08-02
The x11_open_helper function in channels.c in ssh in OpenSSH before 6.9, when ForwardX11Trusted mode is not used, lacks a check of the refusal deadline for X connections, which makes it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time ...

CVE-2015-5537
Published: 2015-08-02
The SSL layer of the HTTPS service in Siemens RuggedCom ROS before 4.2.0 and ROX II does not properly implement CBC padding, which makes it easier for man-in-the-middle attackers to obtain cleartext data via a padding-oracle attack, a different vulnerability than CVE-2014-3566.

CVE-2015-5600
Published: 2015-08-02
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumptio...

CVE-2015-1009
Published: 2015-07-31
Schneider Electric InduSoft Web Studio before 7.1.3.5 Patch 5 and Wonderware InTouch Machine Edition through 7.1 SP3 Patch 4 use cleartext for project-window password storage, which allows local users to obtain sensitive information by reading a file.

Dark Reading Radio
Archived Dark Reading Radio
What’s the future of the venerable firewall? We’ve invited two security industry leaders to make their case: Join us and bring your questions and opinions!