Vulnerability CVE-2017-3204

Vulnerability Name:

CVE-2017-3204 (CCN-128718)

Assigned:

2016-12-05

Published:

2017-03-29

Updated:

2020-07-07

Summary:

The Go SSH library (x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks. Default behavior changed in commit e4e2799 to require explicitly registering a hostkey verification mechanism.

CVSS v3 Severity:

8.1 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.1 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): High Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

8.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.1 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): High Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

CVSS v2 Severity:

6.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Medium Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

7.6 High (CCN CVSS v2 Vector: AV:N/AC:H/Au:N/C:C/I:C/A:C)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): High Athentication (Au): None
Impact Metrics:	Confidentiality (C): Complete Integrity (I): Complete Availibility (A): Complete

Vulnerability Type:

CWE-noinfo

Vulnerability Consequences:

Gain Access

References:

Source: MITRE
Type: CNA
CVE-2017-3204

Source: BID
Type: Third Party Advisory, VDB Entry
97481

Source: CCN
Type: BID-97481
Golang Go SSH Library CVE-2017-3204 Security Bypass Vulnerability

Source: MISC
Type: Third Party Advisory
https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/

Source: XF
Type: UNKNOWN
gossh-cve20173204-mitm(128718)

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991

Source: CCN
Type: Go GIT Repository
x/crypto/ssh: make ClientConfig HostKeyCallback non-permissive by default #19767

Source: CONFIRM
Type: Third Party Advisory
https://github.com/golang/go/issues/19767

Source: MISC
Type: Vendor Advisory
https://godoc.org/golang.org/x/crypto/ssh

Source: CCN
Type: IBM Security Bulletin 6833248 (CICS TX Standard)
IBM CICS TX Standard is vulnerable to multiple vulnerabilities in Golang Go.

Vulnerable Configuration:

Configuration 1:

cpe:/a:golang:crypto:*:*:*:*:*:*:*:* (Version <= 2017-03-17)

Configuration CCN 1:

cpe:/a:golang:go:-:*:*:*:*:*:*:*

AND

cpe:/a:ibm:cics_tx:11.1:*:*:*:standard:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:com.ubuntu.xenial:def:201732040000000	V	CVE-2017-3204 on Ubuntu 16.04 LTS (xenial) - low.	2017-04-04
oval:com.ubuntu.artful:def:20173204000	V	CVE-2017-3204 on Ubuntu 17.10 (artful) - low.	2017-04-04
oval:com.ubuntu.xenial:def:20173204000	V	CVE-2017-3204 on Ubuntu 16.04 LTS (xenial) - low.	2017-04-04
oval:com.ubuntu.disco:def:201732040000000	V	CVE-2017-3204 on Ubuntu 19.04 (disco) - low.	2017-04-04
oval:com.ubuntu.bionic:def:20173204000	V	CVE-2017-3204 on Ubuntu 18.04 LTS (bionic) - low.	2017-04-04
oval:com.ubuntu.cosmic:def:201732040000000	V	CVE-2017-3204 on Ubuntu 18.10 (cosmic) - low.	2017-04-04
oval:com.ubuntu.cosmic:def:20173204000	V	CVE-2017-3204 on Ubuntu 18.10 (cosmic) - low.	2017-04-04
oval:com.ubuntu.bionic:def:201732040000000	V	CVE-2017-3204 on Ubuntu 18.04 LTS (bionic) - low.	2017-04-04
oval:com.ubuntu.trusty:def:20173204000	V	CVE-2017-3204 on Ubuntu 14.04 LTS (trusty) - low.	2017-04-04

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