Security readout for executives and security teams
Plain-English summary
This flaw could let a Vault-issued SSH one-time password be accepted for a broader subnet instead of only the intended host IP. That weakens host-specific access control for environments using HashiCorp vault-ssh-helper 0.1.6 or earlier. The public record says it is fixed in 0.2.0.
Executive priority
Treat this as a focused access-control fix for infrastructure using Vault-backed SSH OTPs. It is not listed as actively exploited, but it affects administrative access paths, so upgrade during the next security maintenance window or faster for privileged environments.
Technical view
HashiCorp vault-ssh-helper through 0.1.6 validated SSH OTPs against the subnet of a host network interface, not the specific assigned IP address. This could expand where an otherwise valid Vault-issued OTP is accepted. The available sources identify version 0.2.0 as the fix.
Likely exposure
Exposure is limited to deployments using HashiCorp vault-ssh-helper 0.1.6 or earlier with Vault SSH OTP authentication. Risk is higher where multiple hosts or interfaces share subnets and host-specific IP validation is expected.
Exploitation context
CISA KEV is false, and the provided sources do not report active exploitation. The issue appears to require a valid Vault-issued SSH OTP and an environment where subnet-level acceptance creates unintended access.
Researcher notes
The source bundle lacks CVSS, CWE, exploit details, and detailed configuration impact. Analysis should stay bounded to the documented validation error and fixed version. Do not assume impact outside HashiCorp vault-ssh-helper deployments using Vault-issued SSH OTPs.
Mitigation direction
- Upgrade HashiCorp vault-ssh-helper to version 0.2.0 or later.
- Inventory systems using vault-ssh-helper 0.1.6 or earlier.
- Review HashiCorp release notes and changelog for upgrade guidance.
- Review Vault SSH OTP role scoping and host IP assumptions.
- Monitor SSH OTP authentication logs for unexpected host use.
Validation and detection
- Confirm installed vault-ssh-helper versions across SSH hosts.
- Identify hosts using Vault SSH OTP authentication.
- Verify production deployments no longer run 0.1.6 or earlier.
- Review SSH and Vault audit logs for unusual OTP acceptance patterns.
- Confirm host IP restrictions match intended access boundaries.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2020-24359 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/hashicorp/vault-ssh-helper/releasesCVE reference · x_refsource_MISC
- https://github.com/hashicorp/vault-ssh-helper/blob/master/CHANGELOG.md#020-august-19-2020CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.