CVE-2023-46234: Signature Forgery Attack in browserify-sign
Summary
CVE-2023-46234: browserify-sign upper bound check issue in dsaVerify leads to a signature forgery attack. Affects browserify-sign versions >= 2.6.0, < 4.2.2. Fixed in 4.2.2. How to fix ↓
Also tracked for
- node-browserify-sign · Debian:11
The same CVE-2023-46234 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
browserify-sign is an npm package used for signing and verifying data using the DSA (Digital Signature Algorithm) algorithm. It provides a set of functions for generating and verifying DSA signatures. The package is widely used in various applications for ensuring data integrity and authenticity. However, a vulnerability has been discovered in the DSA verification process, which allows an attacker to forge signatures and bypass the verification process.
Vulnerability Detail
The vulnerability in browserify-sign arises from an upper bound check issue in the dsaVerify function. This function is responsible for verifying the validity of DSA signatures. The checkValue function, called within dsaVerify, incorrectly checks the upper bound of the signature parameters r and s. As a result, an attacker can construct signatures with (r, s) = (1, q) that pass the verification process for any public key. This allows the attacker to forge signatures and potentially impersonate legitimate users or tamper with data integrity.
How To Fix
Minimum fixed version
4.2.2
This is the first release that contains the fix.
npm install browserify-sign@4.2.2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a workaround, developers can manually validate the signature parameters r and s outside of the browserify-sign package. By implementing custom validation logic, developers can ensure that the signature parameters are within the valid range before passing them to the dsaVerify function.
Conclusion
The vulnerability in browserify-sign allows for signature forgery attacks, potentially compromising data integrity and authenticity. It is crucial for developers to update their browserify-sign package to version 4.2.2 or higher to mitigate this vulnerability. Additionally, implementing custom validation logic can serve as a temporary workaround until the package is updated. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
browserify-sign is an npm package used for signing and verifying data using the DSA algorithm.
The vulnerability allows an attacker to forge signatures and bypass the verification process, potentially leading to unauthorized access or data tampering.
To fix the vulnerability, update the browserify-sign package to version 4.2.2 or higher.
Yes, developers can implement custom validation logic to ensure the signature parameters are within the valid range before passing them to the dsaVerify function.
You can use Vulert's playground (https://vulert.com/scanner) to check if your application is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities using package-lock.json.
