CVE-2018-20000 : What You Need to Know
Learn about CVE-2018-20000, an XXE vulnerability in Apereo Bedework bw-webdav before 4.0.3, allowing unauthorized access to local files. Find mitigation steps and prevention measures here.
XXE attacks are possible in versions of Apereo Bedework bw-webdav prior to 4.0.3. This vulnerability allows a specific type of document to read a file stored locally on the system.
Understanding CVE-2018-20000
This CVE identifies an XML External Entity (XXE) vulnerability in Apereo Bedework bw-webdav before version 4.0.3.
What is CVE-2018-20000?
CVE-2018-20000 is an XXE vulnerability in Apereo Bedework bw-webdav that enables malicious actors to perform XXE attacks by exploiting a specific document type.
The Impact of CVE-2018-20000
This vulnerability allows unauthorized access to local files on the system, potentially leading to sensitive data exposure and unauthorized information retrieval.
Technical Details of CVE-2018-20000
Apereo Bedework bw-webdav before version 4.0.3 is susceptible to XXE attacks due to specific files within the software.
Vulnerability Description
The vulnerability is demonstrated by a document type called "invite-reply" that can read local files, specifically affecting webdav/servlet/common/MethodBase.java and webdav/servlet/common/PostRequestPars.java.
Affected Systems and Versions
- Product: Apereo Bedework bw-webdav
- Versions affected: Prior to 4.0.3
Exploitation Mechanism
Malicious actors can exploit this vulnerability by crafting a malicious invite-reply document to access and read files stored locally on the system.
Mitigation and Prevention
It is crucial to take immediate steps to mitigate the risks posed by CVE-2018-20000.
Immediate Steps to Take
- Update Apereo Bedework bw-webdav to version 4.0.3 or later to eliminate the vulnerability.
- Implement strict input validation to prevent malicious XML input.
Long-Term Security Practices
- Regularly monitor and audit system logs for any suspicious activities.
- Educate users on the risks of opening untrusted documents or files.
Patching and Updates
- Stay informed about security updates and patches released by the software vendor.
- Apply patches promptly to ensure the system is protected against known vulnerabilities.