spring-boot versions prior to version v2.2.11.RELEASE was vulnerable to temporary directory hijacking. This vulnerability impacted the org.springframework.boot.web.server.AbstractConfigurableWebServerFactory.createTempDir method. NOTE: This vulnerability only affects products and/or versions that are no longer supported by the maintainer

Affected: Maven: org.springframework.boot:spring-boot

spring-boot versions prior to version `v2.2.11.RELEASE` was vulnerable to temporary directory hijacking. This vulnerability impacted the `org.springframework.boot.web.server.AbstractConfigurableWebServerFactory.createTempDir` method.

The vulnerable method is used to create a work directory for embedded web servers such as Tomcat and Jetty. The directory contains configuration files, JSP/class files, etc. If a local attacker got the permission to write in this directory, they could completely take over the application (ie. local privilege escalation).

#### Impact Location

This vulnerability impacted the following source location:

```java /** * Return the absolute temp dir for given web server. * @param prefix server name * @return the temp dir for given server. */ protected final File createTempDir(String prefix) { try { File tempDir = File.createTempFile(prefix + ".", "." + getPort()); tempDir.delete(); tempDir.mkdir(); tempDir.deleteOnExit(); return tempDir; } ``` \- https://github.com/spring-projects/spring-boot/blob/ce70e7d768977242a8ea6f93188388f273be5851/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/server/AbstractConfigurableWebServerFactory.java#L165-L177

This vulnerability exists because `File.mkdir` returns `false` when it fails to create a directory, it does not throw an exception. As such, the following race condition exists:

```java File tmpDir =File.createTempFile(prefix + ".", "." + getPort()); //…

Ein lokaler Angreifer kann eine Schwachstelle in VMware Tanzu Spring Boot ausnutzen, um seine Privilegien zu erhöhen.