CVE-2020-8911
5.6 · MEDIUMOverview
CVE-2020-8911 is a medium-severity vulnerability affecting amazon aws_s3_crypto_sdk. It was published on August 11, 2020 and has a CVSS 3.1 base score of 5.6 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.6, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target's S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC's ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.
Remediation
Check the references section for vendor advisories and patches from amazon. Update aws_s3_crypto_sdk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| amazon | aws_s3_crypto_sdk | >= 0, < 2.0 | Affected |
References
Frequently Asked Questions
What is CVE-2020-8911?
CVE-2020-8911 is a medium-severity vulnerability affecting amazon aws_s3_crypto_sdk. It was published on August 11, 2020 and has a CVSS 3.1 base score of 5.6 (MEDIUM).
How severe is CVE-2020-8911?
This vulnerability has a CVSS 3.1 base score of 5.6, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2020-8911?
Check the references section for vendor advisories and patches from amazon. Update aws_s3_crypto_sdk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2020-8911?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-8911 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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