Temporary Directory Hijacking to Local Privilege Escalation Vulnerability in 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:
/**
* 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;
}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:
File tmpDir =File.createTempFile(prefix + ".", "." + getPort()); // Attacker knows the full path of the file that will be generated
// delete the file that was created
tmpDir.delete(); // Attacker sees file is deleted and begins a race to create their own directory before Jetty.
// and make a directory of the same name
// SECURITY VULNERABILITY: Race Condition! - Attacker beats java code and now owns this directory
tmpDir.mkdirs(); // This method returns 'false' because it was unable to create the directory. No exception is thrown.
// Attacker can write any new files to this directory that they wish.
// Attacker can read any files created by this process.Prerequisites
This vulnerability impacts Unix-like systems, and very old versions of Mac OSX and Windows as they all share the system temporary directory between all users.
Patches
This vulnerability was inadvertently fixed as a part of this patch: https://github.com/spring-projects/spring-boot/commit/667ccdae84822072f9ea1a27ed5c77964c71002d
This vulnerability is patched in versions v2.2.11.RELEASE or later.
Workarounds
Setting the java.io.tmpdir system environment variable to a directory that is exclusively owned by the executing user will fix this vulnerability for all operating systems.
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| Platforma | Paczka | Podatne wersje | Poprawka w wersji |
|---|---|---|---|
| Java / Kotlin (Maven) | org.springframework.boot:spring-boot | < 2.2.11.RELEASE | 2.2.11.RELEASE |
Odnośniki
- Wektor CVSS
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H- Słabość (CWE)
CWE-377, CWE-379, CWE-668- Platforma
- Java / Kotlin (Maven)
- Paczka
org.springframework.boot:spring-boot- Ujawniono
- 11.07.2022
- Aktualizacja
- 11.10.2026 12:22
Źródła i licencje
OSV / GitHub Advisory Database - GHSA-cm59-pr5q-cw85 - CC BY 4.0
Historia podatności: org.springframework.boot:spring-boot
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Temporary Directory Hijacking to Local Privilege Escalation Vulnerability in org.springframework.boot:spring-boot ten wpis
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