Critical ECDSA Signature Validation Flaw in Bouncy Castle Package
Summary
CVE-2016-1000342: In the Bouncy Castle JCE Provider version 1.55 and earlier ECDSA does not fully validate ASN.1 encoding of signature on verification. Affects bouncycastle across 2 version ranges.
< 1.56-1
< 843c2e60f67d71faf81d236f448ebbe56c62c647
Fixed in 1.56-1. How to fix ↓
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Background
Bouncy Castle is a widely used cryptographic library that provides a range of cryptographic algorithms and protocols for Java and other languages. It is known for its flexibility and extensive support for various cryptographic standards. However, versions 1.55 and earlier of the Bouncy Castle JCE Provider are vulnerable to a significant flaw in the ECDSA signature verification process, which can lead to security breaches.
Vulnerability Detail
The vulnerability, identified as CVE-2016-1000342, arises from the ECDSA implementation in the Bouncy Castle JCE Provider. It fails to fully validate the ASN.1 encoding of signatures during the verification process. This oversight allows attackers to inject additional elements into the signature sequence, potentially introducing 'invisible' data into a signed structure. Such a flaw can compromise the integrity of the data, leading to unauthorized access or manipulation of sensitive information.
How To Fix
Minimum fixed version
1.56-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade bouncycastleTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If an immediate upgrade is not feasible, consider implementing additional validation checks in your application to verify the integrity of ECDSA signatures before processing them. This may involve manually inspecting the ASN.1 encoding of signatures to ensure they conform to expected formats.
Conclusion
The ECDSA signature validation flaw in the Bouncy Castle package poses a significant risk to applications that rely on this library for cryptographic operations. It is crucial for developers to upgrade to the latest version to mitigate this vulnerability and ensure the integrity of their applications.
See every vulnerability recorded for bouncycastle →
FAQ
CVE-2016-1000342 is a vulnerability in the Bouncy Castle JCE Provider that allows for improper validation of ECDSA signatures, potentially leading to data integrity issues.
Versions 1.55 and earlier of the Bouncy Castle JCE Provider are affected by this vulnerability.
Exploitation of this vulnerability can lead to unauthorized data manipulation, loss of data integrity, and potential security breaches in applications relying on ECDSA signatures.
You can use Vulert, which monitors open-source vulnerabilities in your software. By simply using a manifest file like package-lock.json, you can check for vulnerabilities without needing to install any software.
The CVSS score for CVE-2016-1000342 is 7.5, indicating a high severity level.
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