Remote code execution in Microsoft IIS

1) Integer overflow

EUVDB-ID: #VU71091

Risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2015-1635

CWE-ID: CWE-190 - Integer overflow

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow within the UlAdjustRangeToContentSize() function within HTTP.sys driver when handling HTTP requests. A remote attacker can a specially crafted HTTP request to the affected web server, trigger an integer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows Server: 2008 - 2012 R2

Windows: 7 - 8.1

Microsoft IIS: 7.0 - 10.0

CPE2.3

• cpe:2.3:o:microsoft:windows_server:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2008_R2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2008_R2_SP1:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2008_SP2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_Gold:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012_R2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:8.1:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:microsoft_iis:7.0:*:*:*:*:*:*:*

External links

https://packetstormsecurity.com/files/131463/Microsoft-Windows-HTTP.sys-Proof-Of-Concept.html
https://www.osvdb.org/120629
https://www.securityfocus.com/bid/74013
https://www.securitytracker.com/id/1032109
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-034
https://www.exploit-db.com/exploits/36773/
https://www.exploit-db.com/exploits/36776/

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.