CVE-2017-7957 : Vulnerability Insights and Analysis
Learn about CVE-2017-7957, a vulnerability in XStream through version 1.4.9 that mishandles attempts to create an instance of the primitive type 'void' during unmarshalling, potentially leading to a remote application crash.
XStream through version 1.4.9 has a vulnerability that mishandles attempts to create an instance of the primitive type 'void' during unmarshalling, potentially leading to a remote application crash.
Understanding CVE-2017-7957
XStream is susceptible to a remote code execution vulnerability that can be exploited to crash applications.
What is CVE-2017-7957?
When XStream versions up to 1.4.9 are used without a specific workaround, a vulnerability arises in handling attempts to create an instance of the primitive type 'void' during the unmarshalling process. This flaw can be exploited remotely, causing the application to crash. An example of exploiting this vulnerability is demonstrated by making a call to xstream.fromXML("<void/>").
The Impact of CVE-2017-7957
The vulnerability in XStream can be exploited remotely, potentially leading to a denial of service (DoS) condition by crashing the application.
Technical Details of CVE-2017-7957
XStream vulnerability details and affected systems.
Vulnerability Description
XStream through 1.4.9, when a certain denyTypes workaround is not used, mishandles attempts to create an instance of the primitive type 'void' during unmarshalling, leading to a remote application crash, as demonstrated by an xstream.fromXML("<void/>") call.
Affected Systems and Versions
- Product: N/A
- Vendor: N/A
- Versions affected: Up to 1.4.9
Exploitation Mechanism
The vulnerability can be exploited remotely by making a specific call to xstream.fromXML("<void/>").
Mitigation and Prevention
Steps to mitigate and prevent the CVE-2017-7957 vulnerability.
Immediate Steps to Take
- Apply the necessary patches provided by the vendor.
- Implement proper input validation to prevent malicious XML input.
Long-Term Security Practices
- Regularly update XStream to the latest version.
- Monitor security advisories for any new vulnerabilities.
Patching and Updates
- Check for updates and patches from the XStream vendor.
- Apply security updates promptly to mitigate the risk of exploitation.