9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8 High
AI Score
Confidence
High
0.974 High
EPSS
Percentile
99.9%
Multiple serious vulnerabilities have been found in Microsoft Server Message Block 1.0(SMBv1). Malicious users can exploit these vulnerabilities to execute arbitrary code or obtain sensitive information.
Below is a complete list of vulnerabilities:
Technical details
Successful exploitation of these vulnerabilities can trigger WannaCry attack.
In case of WannaCry attack, EternalBlue modules are used to begin exploiting SMB vulnerabilities; if an attempt of exploit is successful, the DoblePulsar backdoor is used to install the malware.
Both SMBv1 and SMBv2 packets can be used in WannaCry attack, so disabling them can prevent the operational system from being infected. It is highly recommended to disable SMBv1, because this old protocol doesn’t have any significant impacts on modern operational systems. Disabling SMBv2 can cause serious problems.
For more details see Securelist article.
Users of Windows XP, Windows 8 and Windows server 2003 should read Customer Guidance for WannaCrypt attacks from Microsoft.
Note that Windows 10 and Windows Server 2016 are not affected by the WannaCry attack.
Customer Guidance for WannaCrypt attacks
This vulnerability can be exploited by the following malware:
https://threats.kaspersky.com/en/threat/Intrusion.Win.EternalRomance/
https://threats.kaspersky.com/en/threat/Intrusion.Win.CVE-2017-0147.sa.leak/
Public exploits exist for this vulnerability.
CVE-2017-0143 critical
CVE-2017-0144 critical
CVE-2017-0145 critical
CVE-2017-0146 critical
CVE-2017-0147 high
CVE-2017-0148 critical
Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)
Arbitrary code execution. Exploitation of vulnerabilities with this impact can lead to executing by abuser any code or commands at vulnerable machine or process.
Obtain sensitive information. Exploitation of vulnerabilities with this impact can lead to capturing by abuser information, critical for user or system.
support.microsoft.com/kb/4012212
support.microsoft.com/kb/4012213
support.microsoft.com/kb/4012214
support.microsoft.com/kb/4012215
support.microsoft.com/kb/4012216
support.microsoft.com/kb/4012217
support.microsoft.com/kb/4012598
support.microsoft.com/kb/4012606
support.microsoft.com/kb/4013198
support.microsoft.com/kb/4013429
blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0143
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0144
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0145
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0146
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0147
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0148
securelist.com/blog/incidents/78351/wannacry-ransomware-used-in-widespread-attacks-all-over-the-world/
securelist.com/blog/incidents/78351/wannacry-ransomware-used-in-widespread-attacks-all-over-the-world/
statistics.securelist.com/
technet.microsoft.com/en-us/library/security/ms17-010.aspx
threats.kaspersky.com/en/product/Microsoft-Windows-10/
threats.kaspersky.com/en/product/Microsoft-Windows-7/
threats.kaspersky.com/en/product/Microsoft-Windows-8/
threats.kaspersky.com/en/product/Microsoft-Windows-Server-2003/
threats.kaspersky.com/en/product/Microsoft-Windows-Server-2008/
threats.kaspersky.com/en/product/Microsoft-Windows-Server-2012/
threats.kaspersky.com/en/product/Microsoft-Windows-Vista-4/
threats.kaspersky.com/en/product/Microsoft-Windows-XP/
threats.kaspersky.com/en/product/Windows-RT/
threats.kaspersky.com/en/threat/Intrusion.Win.CVE-2017-0147.sa.leak/
threats.kaspersky.com/en/threat/Intrusion.Win.EternalRomance/
9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8 High
AI Score
Confidence
High
0.974 High
EPSS
Percentile
99.9%