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Directory Traversal in OpenMRS Startup Filter

High
gracepotma published GHSA-8rgr-ww69-jv65 Feb 22, 2022

Package

openmrs (N/A)

Affected versions

>= 1.6

Patched versions

2.1.5, 2.2.1, 2.3.5, 2.4.5, 2.5.3

Description

Impact

Arbitrary file exfiltration due to failure to sanitize request when satisfying GET requests for /images & /initfilter/scripts. This can allow an attacker to access any file on a system running OpenMRS that is accessible to the user id OpenMRS is running under.

Vulnerability location:

			if (servletPath.startsWith("/images") || servletPath.startsWith("/initfilter/scripts")) {
				servletPath = servletPath.replaceFirst("/initfilter", "/WEB-INF/view"); // strip out the /initfilter part
				// writes the actual image file path to the response
				File file = new File(filterConfig.getServletContext().getRealPath(servletPath));
				if (httpRequest.getPathInfo() != null) {
					file = new File(file, httpRequest.getPathInfo()); // VULNERABILITY: `httpRequest.getPathInfo()` is user controlled and can contain `../../..` path traversal payloads
				}
				
				InputStream imageFileInputStream = null;
				try {
					imageFileInputStream = new FileInputStream(file);
					OpenmrsUtil.copyFile(imageFileInputStream, httpResponse.getOutputStream()); // VULNERABILITY: Attacker controlled path file is returned
				}

Patches

Affected implementations should update to the latest patch version of OpenMRS Core for the minor version they use. These are:

  • 2.1.5
  • 2.2.1
  • 2.3.5
  • 2.4.5
  • 2.5.3

Patch that fixes this vulnerability can be found here: db8454b#diff-7c64d9f61d4d4e2ddba92920d7cf63ec96091b308d43904956b3846bc0c26d80R128

Workarounds and Mitigation

As a general rule, this vulnerability is already mitigated by Tomcat's URL normalization in Tomcat 7.0.28+. Implementers on older versions of Tomcat should consider upgrading their Tomcat instance as well as their OpenMRS instance.

For more information

If you have any questions or comments about this advisory:

Severity

High
7.5
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVE ID

CVE-2022-23612

Weaknesses

No CWEs

Credits