Denial of service in LSASS in Microsoft Windows

1) Improper input validation

EUVDB-ID: #VU4101

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-0004

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause denial of service conditions.

The vulnerability exists due to the way the Local Security Authority Subsystem Service (LSASS) handles authentication requests. A remote unauthenticated attacker can send a specially crafted authentication request to vulnerable system and trigger its automatic reboot.

Successful exploitation of the vulnerability will result in denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: Vista - 7

Windows Server: 2008 - 2008 R2

CPE2.3

• cpe:2.3:o:microsoft:windows:Vista:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:*:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2008_R2:*:*:*:*:*:*:*

External links

https://technet.microsoft.com/en-us/library/security/ms17-004.asp
https://support.microsoft.com/en-us/kb/3216771

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?

No. We are not aware of malware exploiting this vulnerability.