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
Latest Comment: nice one
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-2015-1235
Published: 2015-04-19
The ContainerNode::parserRemoveChild function in core/dom/ContainerNode.cpp in the HTML parser in Blink, as used in Google Chrome before 42.0.2311.90, allows remote attackers to bypass the Same Origin Policy via a crafted HTML document with an IFRAME element.

CVE-2015-1236
Published: 2015-04-19
The MediaElementAudioSourceNode::process function in modules/webaudio/MediaElementAudioSourceNode.cpp in the Web Audio API implementation in Blink, as used in Google Chrome before 42.0.2311.90, allows remote attackers to bypass the Same Origin Policy and obtain sensitive audio sample values via a cr...

CVE-2015-1237
Published: 2015-04-19
Use-after-free vulnerability in the RenderFrameImpl::OnMessageReceived function in content/renderer/render_frame_impl.cc in Google Chrome before 42.0.2311.90 allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors that trigger renderer IPC messages ...

CVE-2015-1238
Published: 2015-04-19
Skia, as used in Google Chrome before 42.0.2311.90, allows remote attackers to cause a denial of service (out-of-bounds write) or possibly have unspecified other impact via unknown vectors.

CVE-2015-1240
Published: 2015-04-19
gpu/blink/webgraphicscontext3d_impl.cc in the WebGL implementation in Google Chrome before 42.0.2311.90 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted WebGL program that triggers a state inconsistency.

Dark Reading Radio
Archived Dark Reading Radio
Join security and risk expert John Pironti and Dark Reading Editor-in-Chief Tim Wilson for a live online discussion of the sea-changing shift in security strategy and the many ways it is affecting IT and business.