CVE-2021-32740 : What You Need to Know
Learn about CVE-2021-32740, a vulnerability in Addressable templates allowing uncontrolled resource consumption leading to denial of service. Find out how to mitigate this issue.
Addressable is an alternative implementation to the URI implementation in Ruby. An uncontrolled resource consumption vulnerability exists from version 2.3.0 through 2.7.0, allowing a maliciously crafted template to result in denial of service when matched against a URI. This CVE has a CVSS base score of 7.5.
Understanding CVE-2021-32740
Regular Expression Denial of Service (ReDoS) is a type of Denial of Service attack that targets regular expression implementations. In the case of Addressable templates, a vulnerability allows uncontrolled resource consumption when processing malicious templates.
What is CVE-2021-32740?
CVE-2021-32740 is a vulnerability in Addressable templates where an attacker can exploit a crafted template to cause uncontrolled resource consumption, leading to denial of service.
The Impact of CVE-2021-32740
The impact of this vulnerability is high, with a base CVSS score of 7.5. Attackers can exploit this issue to disrupt services by causing excessive resource consumption.
Technical Details of CVE-2021-32740
Vulnerability Description
The vulnerability in Addressable templates allows for uncontrolled resource consumption, potentially resulting in denial of service.
Affected Systems and Versions
Versions of Addressable from 2.3.0 to 2.7.0 are affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by manipulating URI templates, causing excessive resource consumption when processed.
Mitigation and Prevention
Immediate Steps to Take
Users are advised to update to version 2.8.0 of Addressable to patch this vulnerability. Avoid creating Template objects from untrusted sources to prevent catastrophic backtracking.
Long-Term Security Practices
Implement secure coding practices and avoid processing untrusted user input in URI templates to mitigate similar vulnerabilities.
Patching and Updates
Ensure that all systems running affected versions of Addressable are updated to version 2.8.0 or newer to prevent exploitation of this vulnerability.