SID 1:36950

Rule Category

BROWSER-IE -- Snort has detected traffic known to exploit vulnerabilities present in the Internet Explorer browser, or products that have the Trident or Tasman engines.

Alert Message

BROWSER-IE Microsoft Internet Explorer SComputedStyle destructor out of bounds read attempt

Rule Explanation

Microsoft Internet Explorer 11 and Microsoft Edge allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Microsoft Browser Memory Corruption Vulnerability," a different vulnerability than CVE-2015-6142, CVE-2015-6143, CVE-2015-6153, CVE-2015-6158, CVE-2015-6159, and CVE-2015-6160.

What To Look For

This rule detects the attempted download of malicious JavaScript that can be used to trigger arbitrary code execution in vulnerable versions of Microsoft Internet Explorer 11 and Microsoft Edge.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

MITRE::ATT&CK Framework::Enterprise::Execution::User Execution::Malicious File

An adversary may rely upon a user opening a malicious file in order to gain execution. Users may be subjected to social engineering to get them to open a file that will lead to code execution. This user action will typically be observed as follow-on behavior from Spearphishing Attachment. Adversaries may use several types of files that require a user to execute them, including .doc, .pdf, .xls, .rtf, .scr, .exe, .lnk, .pif, and .cpl.

MITRE::ATT&CK Framework::Enterprise::Initial Access::Drive-by Compromise

CVE

CVE-2015-6140 CVE-2015-6142

Additional Links

technet.microsoft.com/en-us/security/bulletin/MS15-124

technet.microsoft.com/en-us/security/bulletin/MS15-125

Rule Vulnerability

Memory Corruption

Memory Corruption is any vulnerability that allows the modification of the content of memory locations in a way not intended by the developer. Memory corruption results are inconsistent; they could lead to fatal errors and system crashes or data leakage; some have no effect at all.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.

CVE-2015-6140

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CVE-2015-6142

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