Risk
12/22/2010
10:51 PM
George V. Hulme
George V. Hulme
Commentary
Connect Directly
RSS
E-Mail
50%
50%

Microsoft Moves To Block Zero Day Attack

A French IT security firm recently warned of a new vulnerability that opens most versions of Microsoft Internet Explorer open to attack.

A French IT security firm recently warned of a new vulnerability that opens most versions of Microsoft Internet Explorer open to attack.Should a successful hack be launched, the attacker could circumvent many of the defenses available in both Windows Vista and Windows 7. The attacker could also run code of their choice on the target system.

To make the situation more pressing, the Metasploit project recently added an exploit to its database that successfully evades Microsoft's ASLR (Address Space Layout Randomization) and bypass DEP (Data Execution Prevention) defenses.

In an e-mail to InformationWeek, Microsoft noted that there is currently no indication that customers are being attacked. Late this evening, Microsoft's Security Research & Defense blog posted an update and mitigation guidance for the vulnerability.

Microsoft provided some details on the exploit:

The Metasploit project recently published an exploit for this vulnerability using a known technique to evade ASLR (Address Space Layout Randomization) and bypass DEP (Data Execution Prevention).

In a few words, Internet Explorer loads mscorie.dll, a library that was not compiled with /DYNAMICBASE (thus not supporting ASLR and being located always at the same base) when processing some html tags. Attackers use these predictable mappings to evade ASLR and bypass DEP by using ROP (return oriented programming) gadgets from these DLLs in order to allocate executable memory, copying their shellcode and jumping into it. Note that without that predictable mapping, the only public ways to evade ASLR and DEP is through:

• Use of this (in case the current vulnerability allows) or another vulnerability as an information leak.

• Using techniques such as JIT-spraying or similar ones. Please note IE only JITs IE9's javascript and there are security mitigations in place. But third party plugins could JIT in an insecure manner.

The same post recommends users employ Enhanced Mitigation Experience Toolkit (EMET) to block the threat. According to Microsoft, by using EMET, the associated mandatory ASLR, Heap Spray pre-allocation, and EAT Filtering will all mitigate the risk associated with this attack.

Microsoft also has more information in Security Advisory 2488013.

For my security and technology tweets 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-2013-2595
Published: 2014-08-31
The device-initialization functionality in the MSM camera driver for the Linux kernel 2.6.x and 3.x, as used in Qualcomm Innovation Center (QuIC) Android contributions for MSM devices and other products, enables MSM_CAM_IOCTL_SET_MEM_MAP_INFO ioctl calls for an unrestricted mmap interface, which all...

CVE-2013-2597
Published: 2014-08-31
Stack-based buffer overflow in the acdb_ioctl function in audio_acdb.c in the acdb audio driver for the Linux kernel 2.6.x and 3.x, as used in Qualcomm Innovation Center (QuIC) Android contributions for MSM devices and other products, allows attackers to gain privileges via an application that lever...

CVE-2013-2598
Published: 2014-08-31
app/aboot/aboot.c in the Little Kernel (LK) bootloader, as distributed with Qualcomm Innovation Center (QuIC) Android contributions for MSM devices and other products, allows attackers to overwrite signature-verification code via crafted boot-image load-destination header values that specify memory ...

CVE-2013-2599
Published: 2014-08-31
A certain Qualcomm Innovation Center (QuIC) patch to the NativeDaemonConnector class in services/java/com/android/server/NativeDaemonConnector.java in Code Aurora Forum (CAF) releases of Android 4.1.x through 4.3.x enables debug logging, which allows attackers to obtain sensitive disk-encryption pas...

CVE-2013-6124
Published: 2014-08-31
The Qualcomm Innovation Center (QuIC) init scripts in Code Aurora Forum (CAF) releases of Android 4.1.x through 4.4.x allow local users to modify file metadata via a symlink attack on a file accessed by a (1) chown or (2) chmod command, as demonstrated by changing the permissions of an arbitrary fil...

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
This episode of Dark Reading Radio looks at infosec security from the big enterprise POV with interviews featuring Ron Plesco, Cyber Investigations, Intelligence & Analytics at KPMG; and Chris Inglis & Chris Bell of Securonix.