MS15-031: Vulnerability in Schannel Could Allow Security Feature Bypass (3046049) (FREAK)

Medium Nessus Plugin ID 81745


The remote Windows host is affected by a security feature bypass vulnerability.


The remote Windows host is affected by a security feature bypass vulnerability, known as FREAK (Factoring attack on RSA-EXPORT Keys), due to the support of weak EXPORT_RSA cipher suites with keys less than or equal to 512 bits. A man-in-the-middle attacker may be able to downgrade the SSL/TLS connection to use EXPORT_RSA cipher suites which can be factored in a short amount of time, allowing the attacker to intercept and decrypt the traffic.


Microsoft has released a set of patches for Windows 2003, Vista, 2008, 7, 2008 R2, 8, 2012, 8.1, and 2012 R2.

See Also

Plugin Details

Severity: Medium

ID: 81745

File Name: smb_nt_ms15-031.nasl

Version: $Revision: 1.9 $

Type: local

Agent: windows

Published: 2015/03/10

Modified: 2017/07/24

Dependencies: 57033, 13855

Risk Information

Risk Factor: Medium


Base Score: 5

Temporal Score: 4.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:F/RL:OF/RC:ND

Vulnerability Information

CPE: cpe:/o:microsoft:windows

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2015/03/10

Vulnerability Publication Date: 2015/03/10

Reference Information

CVE: CVE-2015-1637

BID: 72965

OSVDB: 119106

CERT: 243585

MSFT: MS15-031

MSKB: 3046049