CVE-2020-8897 : Vulnerability Insights and Analysis
Learn about CVE-2020-8897, a vulnerability in AWS Encryption SDKs allowing attackers to manipulate cyphertext, impacting multi-recipient scenarios. Update to version 2.0.0 or later for protection.
A weak robustness vulnerability exists in the AWS Encryption SDKs for Java, Python, C, and JavaScript prior to versions 2.0.0. This vulnerability allows an attacker to craft a unique cyphertext that decrypts to multiple different results, posing a risk in multi-recipient scenarios. Users are advised to update their SDK to version 2.0.0 or later.
Understanding CVE-2020-8897
This CVE identifies a weakness in the AWS KMS and Encryption SDKs.
What is CVE-2020-8897?
The vulnerability in the AWS Encryption SDKs allows attackers to create specific cyphertext that decrypts to various outcomes, particularly risky in multi-recipient setups.
The Impact of CVE-2020-8897
The vulnerability's impact is rated as MEDIUM severity with a CVSS base score of 4.8. It has a high integrity impact and requires low privileges for exploitation.
Technical Details of CVE-2020-8897
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The weakness in the AWS Encryption SDKs stems from the non-committing property of AES-GCM and other AEAD ciphers, enabling attackers to manipulate cyphertext to decrypt differently.
Affected Systems and Versions
- Affected Platforms: All
- Affected Product: AWS SDK
- Vendor: Amazon
- Vulnerable Versions: Prior to 2.0.0
Exploitation Mechanism
The vulnerability can be exploited by crafting specific cyphertext that decrypts to multiple results, especially impactful in scenarios involving multiple recipients.
Mitigation and Prevention
Protective measures and actions to mitigate the vulnerability.
Immediate Steps to Take
- Update the AWS Encryption SDK to version 2.0.0 or later.
- Monitor for any unusual decryption results that may indicate exploitation.
Long-Term Security Practices
- Regularly review and update encryption protocols and algorithms.
- Implement secure coding practices to prevent cryptographic vulnerabilities.
Patching and Updates
Stay informed about security advisories and promptly apply patches and updates to the AWS SDK.