CVE-2017-3204
First published: Tue Apr 04 2017(Updated: )
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.
Credit: cret@cert.org cret@cert.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| go/golang.org/x/crypto | <0.0.0-20170330155735-e4e2799dd7aa | 0.0.0-20170330155735-e4e2799dd7aa |
| golang.org/x/crypto | <=2017-03-17 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2017-3204
- https://github.com/golang/go/issues/19767
- https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991
- https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/
- https://go.dev/cl/340830
- https://go.dev/issue/19767
- https://go.googlesource.com/crypto/+/e4e2799dd7aab89f583e1d898300d96367750991
- https://godoc.org/golang.org/x/crypto/ssh
- https://pkg.go.dev/vuln/GO-2020-0013
- https://web.archive.org/web/20170423080311/https://www.securityfocus.com/bid/97481
- https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-3204
- https://github.com/advisories/GHSA-xhjq-w7xm-p8qj (Advisory)
- http://www.securityfocus.com/bid/97481
- https://bridge.grumpy-troll.org/2017/04/golang-ssh-security
- https://go.dev/cl/38701
Frequently Asked Questions
What is the severity of CVE-2017-3204?
CVE-2017-3204 is considered a medium severity vulnerability due to the risk of man-in-the-middle attacks.
How do I fix CVE-2017-3204?
To fix CVE-2017-3204, ensure that the ClientConfig.HostKeyCallback is explicitly set to verify host keys.
Which versions of the Go SSH library are affected by CVE-2017-3204?
CVE-2017-3204 affects versions of the Go SSH library prior to the commit e4e2799.
What type of attack does CVE-2017-3204 facilitate?
CVE-2017-3204 facilitates man-in-the-middle attacks by not verifying host keys.
Is there a default security risk with the Go SSH library as per CVE-2017-3204?
Yes, the default behavior of the Go SSH library does not verify host keys, posing a security risk.
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- collector/github-advisory-latest
- source/GitHub
- alias/GHSA-xhjq-w7xm-p8qj
- alias/CVE-2017-3204
- agent/software-canonical-lookup
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- agent/remedy
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- collector/mitre-cve
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- agent/software-canonical-lookup-request
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- package-manager/go
- vendor/golang
- canonical/golang.org/x/crypto
- version/golang.org/x/crypto/2017-03-17