CVE-2020-7779: Regular Expression Denial of Service in djvalidator
Summary
CVE-2020-7779: Regular Expression Denial of Service in djvalidator. Affects djvalidator versions < 1.1.1. No fix is published. How to fix ↓
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Background
djvalidator is an npm package that provides email validation functionality for Node.js applications. It is used to validate the format of email addresses and ensure they comply with the appropriate standards. However, all versions of djvalidator are vulnerable to a Regular Expression Denial of Service (ReDoS) attack. This vulnerability can be exploited by sending crafted invalid emails, causing the package to enter into an inefficient and time-consuming matching process.
Vulnerability Detail
The vulnerability in djvalidator arises from a lack of proper input validation when processing email addresses. By sending specially crafted invalid emails, an attacker can trigger a ReDoS attack, causing the package to consume excessive CPU resources and potentially leading to a denial of service condition. The vulnerability has a CVSS score of 7.5, indicating a high severity level. It is important to note that this vulnerability only affects versions 0.0.1 to 1.1.1 of djvalidator.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating djvalidator is not immediately feasible, a temporary workaround is to implement additional input validation in your application to filter out potentially malicious or malformed email addresses before passing them to djvalidator. This can be done by using regular expressions or other validation techniques to ensure that only valid email addresses are processed by djvalidator.
Conclusion
In conclusion, djvalidator is vulnerable to a Regular Expression Denial of Service (ReDoS) attack when processing invalid emails. This can lead to excessive CPU usage and potentially result in a denial of service condition. It is crucial to update djvalidator to the latest version to mitigate this vulnerability. If immediate updating is not possible, implementing additional input validation in your application can serve as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
djvalidator is an npm package used for email validation in Node.js applications. It helps ensure that email addresses are in the correct format and comply with relevant standards.
The vulnerability in djvalidator allows an attacker to trigger a ReDoS attack by sending specially crafted invalid emails. This can lead to excessive CPU usage and potentially result in a denial of service condition.
Versions 0.0.1 to 1.1.1 of djvalidator are vulnerable to this ReDoS attack. It is recommended to update to the latest version to mitigate the vulnerability.
The CVSS score of this vulnerability is 7.5, indicating a high severity level.
Yes, a temporary workaround is to implement additional input validation in your application to filter out potentially malicious or malformed email addresses before passing them to djvalidator.
