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

medium Nessus Plugin ID 81745
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Synopsis

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

Description

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.

Solution

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

See Also

https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2015/ms15-031

https://www.smacktls.com/#freak

Plugin Details

Severity: Medium

ID: 81745

File Name: smb_nt_ms15-031.nasl

Version: 1.12

Type: local

Agent: windows

Published: 3/10/2015

Updated: 11/22/2019

Dependencies: smb_hotfixes.nasl, ms_bulletin_checks_possible.nasl

Risk Information

CVSS Score Source: CVE-2015-1637

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/o:microsoft:windows

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 3/10/2015

Vulnerability Publication Date: 3/10/2015

Reference Information

CVE: CVE-2015-1637

BID: 72965

CERT: 243585

MSFT: MS15-031

MSKB: 3046049