Home/CVE/The Go SSH library (x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks. Default
CVE

CVE-2017-3204

The Go SSH library (x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks. Default

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.

HIGH · CVSS 8.1 EPSS 0.00453
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
▤

Affected Products & Versions

1
golang crypto<= 2017-03-17
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go golang.org/x/crypto HIGH fixed in 0.0.0-20170330155735-e4e2799dd7aa
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighLinux Crypto Mining Pool Connections
producthighLinux Crypto Mining Indicators
producthighCisco Crypto Commands
producthighMonero Crypto Coin Mining Pool Lookup
producthighNetwork Communication With Crypto Mining Pool
producthighPotential Crypto Mining Activity
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.1 · cret@cert.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 Apr 2017 · 02:59 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.securityfocus.com/bid/97481Third Party AdvisoryVDB Entry
https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/Third Party Advisory
https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991PatchThird Party Advisory
https://github.com/golang/go/issues/19767Third Party Advisory
https://godoc.org/golang.org/x/crypto/sshVendor Advisory
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