GoogleOSV:GHSA-XHJQ-W7XM-P8QJgolang.org/x/crypto/ssh Man-in-the-Middle attack
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
61.9%
The Go SSH library (golang.org/x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks if ClientConfig.HostKeyCallback is not set. Default behavior changed in commit e4e2799 to require explicitly registering a hostkey verification mechanism.
References
bridge.grumpy-troll.org/2017/04/golang-ssh-security
github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991
github.com/golang/go/issues/19767
go.dev/cl/340830
go.dev/cl/38701
go.dev/issue/19767
go.googlesource.com/crypto/+/e4e2799dd7aab89f583e1d898300d96367750991
godoc.org/golang.org/x/crypto/ssh
nvd.nist.gov/vuln/detail/CVE-2017-3204
pkg.go.dev/vuln/GO-2020-0013
web.archive.org/web/20170423080311/https://www.securityfocus.com/bid/97481
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-3204
Related
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
61.9%