Vulnerability identifier: #VU5650

Vulnerability risk: Critical

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2015-0071

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Internet Explorer
Client/Desktop applications / Web browsers

Vendor: Microsoft

Description
The vulnerabiity allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to failure to use Address Space Layout Randomization (ASLR). A remote attacker can create a specially crafted Web site, trick the victim into visiting it, bypass ASLR mechanism and predict memory locations that if connected with another vulnerability allows to execute arbitrary code.

Successful exploitation of this vulnerability results in security bypass on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Microsoft Internet Explorer: 9 - 11

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External links
http://technet.microsoft.com/en-us/library/security/ms15-009

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.