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Remote command injection when using sendmail email transport

Moderate severity GitHub Reviewed Published Sep 17, 2021 in TryGhost/Ghost • Updated Apr 21, 2023

Package

npm ghost (npm)

Affected versions

< 4.15.0

Patched versions

4.15.0

Description

Impact

Sites using the sendmail transport as part of their mail config are vulnerable to remote command injection due to a vulnerability in the nodemailer dependency.

Ghost defaults to the direct transport so this is only exploitable if the sendmail transport is explicitly used.

Patches

Fixed in 4.15.0, all sites should upgrade as soon as possible.

Workarounds

  • Use an alternative email transport as described in the docs.

For more information

If you have any questions or comments about this advisory:

References

@daniellockyer daniellockyer published to TryGhost/Ghost Sep 17, 2021
Reviewed Sep 17, 2021
Published to the GitHub Advisory Database Sep 20, 2021
Last updated Apr 21, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

EPSS score

Weaknesses

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

The product constructs a string for a command to executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-wfrj-qqc2-83cm

Source code

Credits

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