Vulnerability in Amazon AWS Encryption Sdk
CVE-2020-8897
A weak robustness vulnerability exists in the AWS Encryption SDKs for Java, Python, C and Javalcript prior to versions 2.0.0. Due to the non-committing property of AES-GCM (and other AEAD ciphers such as AES-GCM-SIV or (X)ChaCha20Poly1305) used by the SDKs to encrypt messages, an attacker can craft a unique cyphertext which will decrypt to multiple different results, and becomes especially relevant in a multi-recipient setting. We recommend users update their SDK to 2.0.0 or later.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (31.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Amazon AWS Encryption Sdk
- Amazon AWS Sdk — versions stable
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf (Exploit, Third Party Advisory, Mitigation)
- aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-a… (Vendor Advisory)
Frequently asked questions
- What is CVE-2020-8897?
- CVE-2020-8897 is a medium-severity vulnerability in Amazon AWS Encryption Sdk, classified under Cryptographic Issues. CVSS score: 4.8/10. Published 2020-11-16.
- How severe is CVE-2020-8897?
- Medium severity. CVSS v3 base score is 4.8 out of 10.
- Is CVE-2020-8897 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.