Time of Check Time of Use (TOCTOU) Affecting commons-fileupload:commons-fileupload package, versions [,1.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-COMMONSFILEUPLOAD-30079
- published6 May 2015
- disclosed15 Mar 2013
- creditKarl Dyszynski, Hugo Vazquez Carames
Introduced: 15 Mar 2013
CVE-2013-0248 (opens in a new tab)How to fix?
Upgrade commons-fileupload:commons-fileupload to version 1.3 or higher.
Overview
commons-fileupload:commons-fileupload is a component that provides a simple yet flexible means of adding support for multipart file upload functionality to servlets and web applications.
Affected versions of this package are vulnerable to Time of Check Time of Use (TOCTOU) if the attacker has write access to the /tmp directory.
Details
Commons FileUpload provides file upload capability for Servlets and web applications. During the upload process, FileUpload may (depending on configuration) save the uploaded file temporarily on disk. By default this will be in the system wide tmp directory. Because the temporary files have predictable file names and are stored in a publicly writeable location they are vulnerable to a TOCTOU attack.
A successful attack requires that the attacker has write access to the tmp directory. The attack can be prevented by setting the repository to a non-publicly writeable location. The documentation for FileUpload does not highlight the potential security implications of not setting a repository, nor do the provided examples set a repository. This may have caused users to use FileUpload in an insecure manner.