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Security Response

New Internet Explorer Zero-day Found in Targeted Attacks

Created: 18 Sep 2013 11:48:48 GMT • Updated: 23 Jan 2014 18:04:10 GMT • Translations available: 日本語
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On September 17, Microsoft issued an advisory reporting a new zero-day vulnerability in Internet Explorer: Microsoft Internet Explorer Memory Corruption Vulnerability (CVE-2013-3893). The advisory states that the vulnerability may corrupt memory in a way that could allow attackers to execute arbitrary code. The attack works by enticing users to visit specially crafted websites that host the vulnerability through Internet Explorer. Microsoft also states that at this time the vulnerability is known to be exploited in only a limited number of targeted attacks.

While Microsoft is yet to release a patch for this vulnerability, they have provided a temporary "Fix It” tool solution as a workaround until a security update is made available. To ensure Symantec customers are protected against this Internet Explorer zero-day, the following protection has been put in place:

Antivirus

Intrusion Prevention System

Symantec will continue to investigate this attack to ensure the best possible protection is in place. As always, we recommend that users keep their systems up-to-date with the latest software patches and refrain from opening any suspicious emails. We also advise customers to use the latest Symantec technologies and incorporate the latest Symantec consumer and enterprise solutions to best protect against attacks of this kind.