MS15-121: Security Update for Schannel to Address Spoofing (3081320)

medium Nessus Plugin ID 86827
New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it is different from CVSS.

VPR Score: 5.5

Synopsis

The remote Windows host is affected by a spoofing vulnerability.

Description

The remote Windows host is affected by a spoofing vulnerability due to a weakness in the Secure Channel (SChannel) TLS protocol implementation. A man-in-the-middle attacker can exploit this vulnerability to impersonate a victim on any other server that uses the same credentials as those used between the client and server where the attack is initiated.

Solution

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

See Also

https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2015/ms15-121

Plugin Details

Severity: Medium

ID: 86827

File Name: smb_nt_ms15-121.nasl

Version: 1.9

Type: local

Agent: windows

Published: 11/10/2015

Updated: 11/15/2018

Dependencies: smb_hotfixes.nasl, ms_bulletin_checks_possible.nasl

Risk Information

Risk Factor: Medium

VPR Score: 5.5

CVSS v2.0

Base Score: 5.8

Temporal Score: 4.3

Vector: AV:N/AC:M/Au:N/C:P/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: 11/10/2015

Vulnerability Publication Date: 11/10/2015

Reference Information

CVE: CVE-2015-6112

BID: 77484

MSFT: MS15-121

MSKB: 3081320

IAVA: 2015-A-0273