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Server-Side Request Forgery in charm

Critical severity GitHub Reviewed Published May 6, 2022 in charmbracelet/charm • Updated Jan 27, 2023

Package

gomod github.com/charmbracelet/charm (Go)

Affected versions

>= 0.9.0, < 0.12.1

Patched versions

0.12.1

Description

We've discovered a vulnerability in which attackers could forge HTTP requests to manipulate the charm data directory to access or delete anything on the server. This has been patched in charmbracelet/charm@3c90668 and is available in release v0.12.1. We recommend that all users running self-hosted charm instances update immediately.

This vulnerability was found in-house and we haven't been notified of any potential exploiters.

Additional notes

  • Encrypted user data uploaded to the Charm server is safe as Charm servers cannot decrypt user data. This includes filenames, paths, and all key-value data.
  • Users running the official Charm Docker images are at minimal risk because the exploit is limited to the containerized filesystem.

For more information

If you have any questions or comments about this advisory:

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References

@toby toby published to charmbracelet/charm May 6, 2022
Published by the National Vulnerability Database May 7, 2022
Published to the GitHub Advisory Database May 24, 2022
Reviewed May 24, 2022
Last updated Jan 27, 2023

Severity

Critical

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
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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:U/C:H/I:H/A:H

EPSS score

0.197%
(57th percentile)

Weaknesses

CVE ID

CVE-2022-29180

GHSA ID

GHSA-4wpp-w5r4-7v5v

Source code

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