Instead of making the browser more secure, Microsoft's August Internet Explorer security update introduced a critical security bug, according to researchers at eEye Digital Security.
Microsoft released the security patch, known as MS06-042 on Aug. 8, but users soon reported several problems with the software.
Patched browsers would crash when using Web-based versions of several applications, including PeopleSoft, Siebel, and Sage CRM. Web sites that used HTTP (HyperText Transfer Protocol) 1.1 compression to speed up the downloading of images could also cause the browser to fail.
These issues are described here. The MS06-042 update is detailed here.
Last week, Microsoft released a "hotfix" download that addressed these problems, but the software giant will also take the unusual step of re-releasing the entire MS06-042 update, thus ensuring that all Windows users would automatically receive the updated code.
What Microsoft hasn't told its users, eEye said Tuesday, is that the browser-crashing bug could also be used by attackers to run unauthorized software on a victim's PC.
"What people didn't know about that patch is when [Microsoft] introduced that patch, they actually introduced a new exploitable vulnerability," said eEye Chief Hacking Officer Marc Maiffret. "They basically butchered that patch."
EEye discovered the security problem last week after looking more closely at the crashing problem, but the company believes that the security hole is also known by other security researchers and exploit writers.
"The bad guys basically know about this and know that it's an exploitable scenario," Maiffret said.
Researchers at eEye have created a "proof of concept" exploit for the problem in their labs, but Maiffret did not know of any such code being released to the public. This lessens the likelihood of a widespread attack based on the bug.
Nevertheless, eEye is encouraging IT administrators to apply the revised MS06-042 patch as soon as possible.
The problems with MS06-042 have rekindled an ongoing debate on the subject of responsible disclosure, with eEye faulting Microsoft for not informing customers sooner of the security flaw, and Microsoft saying that eEye's disclosure was done "irresponsibly," according to Tony Chor, a group program manager on the Internet Explorer team.
Microsoft knows of no attackers exploiting the bug at this time, he said. The company has released a security advisory on the matter, which can be found here.
Microsoft had been planning to re-release the MS06-042 update on Tuesday, but that has now been delayed indefinitely as Microsoft fixes an unspecified problem with the patch, Chor said. "Last night, we found an issue that would prevent some customers from being able to deploy the update," he wrote in a Tuesday blog posting. "Unfortunately, we [had] missed this issue, plain and simple."
The delay is due to a bug affecting Microsoft's Systems Management Server (SMS) product, according to a source familiar with the matter. The patch does work with the company's free update services, such as Windows Update, the source added. "Obviously, not everyone has bought [Microsoft's] SMS product, and that shouldn't be a reason to delay patches," the source said.
This whitepaper explains the terminology and concepts behind Data Replication technologies and establishes some sizing rules through worked examples. Learn the new paradigm in disaster tolerance—protect data anywhere.
Download now »
Server virtualization is a popular option for dealing with mounting datacenter costs. Another equally promising approach is the use of an Application Delivery Controller. Citrix NetScaler provides a low-cost way for organizations to reduce their server count and accrue cost savings from a reduction in space, cooling, power and personnel.
Download now »
The emergence of WLANs has created a new breed of security threats to enterprise networks.
Included in HP ProCurve WLAN solutions is security technology that alleviates threats from WLANs through:
* Monitoring wireless activity inside and out of the enterprise
* Classifying WLAN transmissions into harmful and harmless
* Preventing transmissions that pose a security threat to the enterprise network
* Locating participating devices for physical remediation
Effectively address data protection challenges, implementing solutions that help store and protect business–critical data while cutting costs and improving efficiency and reliability.
Download now »
Sign up to receive Security Resource Alerts
This white paper provides guidance on how to develop a strategic approach to managing and monitoring logs, a key function required for compliance with many regulatory mandates and a critical defense against security threats.
Download now! »
Learn about the processes and technologies that support security information management (SIM) operations, as well as the business case for SIM. The series examines different options for implementing SIM and gives you evaluation criteria for selecting the best option for your organization.
Download now! »
Learn the strategies, actions, and capabilities that Best-in-Class organizations employ and technologies they choose to obtain superior performance against various security performance metrics. This report provides guidelines for identifying which security solutions to consume as a MSS and defines best practices for choosing and managing MSSPs.
Download now! »
Recommend This
