CVE-2020-24359: Improper Input Validation in vault-ssh-helper in github.com/hashicorp/vault-ssh-helper
Summary
CVE-2020-24359: Improper Input Validation in vault-ssh-helper in github.com/hashicorp/vault-ssh-helper. Affects github.com/hashicorp/vault-ssh-helper versions < 0.2.0. Fixed in 0.2.0. How to fix ↓
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Background
The package under scrutiny is github.com/hashicorp/vault-ssh-helper, which is written in Go. This package provides a helper tool for integrating HashiCorp Vault with SSH servers. It allows users to authenticate SSH sessions using Vault's dynamic secrets. The vault-ssh-helper tool is responsible for generating temporary credentials and managing the SSH session lifecycle. However, a vulnerability has been discovered in the input validation of this tool.
Vulnerability Detail
The vulnerability in vault-ssh-helper arises from improper input validation. This flaw could potentially allow an attacker to manipulate input data in a way that leads to unauthorized access or privilege escalation. The exact technical details of the vulnerability have not been provided, but it is crucial to address this issue promptly to prevent potential security breaches.
How To Fix
Latest published version: v0.2.4 as of 23 Oct 2026
go get github.com/hashicorp/vault-ssh-helper@v0.2.4Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
0.2.0
This is the first release that contains the fix.
go get github.com/hashicorp/vault-ssh-helper@v0.2.0Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
No workaround has been mentioned for this vulnerability. It is essential to apply the fix by updating to the latest version of the package.
Conclusion
In conclusion, the github.com/hashicorp/vault-ssh-helper package is vulnerable to an improper input validation issue. This vulnerability could potentially lead to unauthorized access or privilege escalation. Users are advised to update to version 0.2.0 or later to mitigate the risk. No known exploits have been reported, but it is crucial to address the issue promptly to ensure the security of SSH servers.
See every vulnerability recorded for github.com/hashicorp/vault-ssh-helper →
FAQ
This vulnerability could potentially allow an attacker to manipulate input data and gain unauthorized access or escalate privileges within the SSH server.
No, versions 0.2.0 and later are not affected by this vulnerability. It is recommended to update to the latest version to mitigate the risk.
No known exploits have been reported for this vulnerability at the time of this report. However, it is crucial to address the issue promptly to prevent any potential security breaches.
Yes, this vulnerability can be exploited remotely if the SSH server is exposed to the internet and the attacker can send malicious input data to the vault-ssh-helper tool.
Apart from updating to the latest version of the package, it is advisable to follow security best practices such as restricting access to the SSH server and implementing strong authentication mechanisms.
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