Shellcode: Javascript 'Unescape' Shellcode
This signature detects shellcode that has been escaped inside JavaScript. This indicates an attack being attempted against a Web browser.
Extended Description
Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2014. NOTE: this issue originally emphasized VGX.DLL, but Microsoft clarified that "VGX.DLL does not contain the vulnerable code leveraged in this exploit. Disabling VGX.DLL is an exploit-specific workaround that provides an immediate, effective workaround to help block known attacks."
References
CVE: CVE-2014-1776
Short Name
SHELLCODE:ACTIVE:JS-UNESCAPE
Severity
Major
Recommended
False
Recommended Action
Drop
Category
SHELLCODE
Keywords
'Unescape' CVE-2014-0322 CVE-2014-1776 Javascript Shellcode
Release Date
05/05/2014
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3727
False Positive
Unknown
CVSS Score
9.3
10.0