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Improper Validation of Integrity Check Value in go-tuf

High severity GitHub Reviewed Published May 5, 2022 in theupdateframework/go-tuf • Updated Feb 17, 2023

Package

gomod github.com/theupdateframework/go-tuf (Go)

Affected versions

< 0.3.0

Patched versions

0.3.0

Description

Impact

go-tuf does not correctly implement the client workflow for updating the metadata files for roles other than the root role. Specifically, checks for rollback attacks are not implemented correctly meaning an attacker can cause clients to install software that is older than the software which the client previously knew to be available, and may include software with known vulnerabilities.

In more detail, the client code of go-tuf has several issues in regards to preventing rollback attacks:

  1. It does not take into account the content of any previously trusted metadata, if available, before proceeding with updating roles other than the root role (i.e., steps 5.4.3.1 and 5.5.5 of the detailed client workflow). This means that any form of version verification done on the newly-downloaded metadata is made using the default value of zero, which always passes.
  2. For both timestamp and snapshot roles, go-tuf saves these metadata files as trusted before verifying if the version of the metafiles they refer to is correct (i.e., steps 5.5.4 and 5.6.4 of the detailed client workflow).

Patches

A fix is available in version 0.3.0 or newer.

Workarounds

No workarounds are known for this issue apart from upgrading.

References

For more information

If you have any questions or comments about this advisory:

References

@joshuagl joshuagl published to theupdateframework/go-tuf May 5, 2022
Published by the National Vulnerability Database May 5, 2022
Published to the GitHub Advisory Database May 24, 2022
Reviewed May 24, 2022
Last updated Feb 17, 2023

Severity

High

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
Low
User interaction
Required
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:L/UI:R/S:U/C:H/I:H/A:H

EPSS score

0.197%
(57th percentile)

Weaknesses

CVE ID

CVE-2022-29173

GHSA ID

GHSA-66x3-6cw3-v5gj

Source code

Credits

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