Potential path traversal from request

Docs > Datadog Security > Code Security > Static Code Analysis (SAST) > SAST Rules > Potential path traversal from request

Metadata

ID: java-security/path-traversal-file-read

Language: Java

Severity: Error

Category: Security

CWE: 22

Related CWEs:

Description

The filename of the file being opened comes from an input parameter. If an unfiltered parameter is passed to the API, any location on the filesystem can be read.

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Non-Compliant Code Examples

class MyClass {

    @GET
    @Path("/images/{image}")
    @Produces("images/*")
    public Response getImage(@javax.ws.rs.PathParam("image") String image) {
        File file = new File("resources/images/", image); //Weak point

        if (!file.exists()) {
            return Response.status(Status.NOT_FOUND).build();
        }

        return Response.ok().entity(new FileInputStream(file)).build();
    }

}

Compliant Code Examples

import org.apache.commons.io.FilenameUtils;

class MyClass {

    @GET
    @Path("/images/{image}")
    @Produces("images/*")
    public Response getImage(@javax.ws.rs.PathParam("image") String image) {
        File file = new File("resources/images/", FilenameUtils.getName(image)); //Fix

        if (!file.exists()) {
            return Response.status(Status.NOT_FOUND).build();
        }

        return Response.ok().entity(new FileInputStream(file)).build();
    }

    @GET
    @Path("/images/{image}")
    @Produces("images/*")
    public Response getImage(@javax.ws.rs.PathParam("image") String image) {
        File file = new File("resources/images/", image2); //Weak point

        if (!file.exists()) {
            return Response.status(Status.NOT_FOUND).build();
        }

        return Response.ok().entity(new FileInputStream(file)).build();
    }

}