Vulnerability Monitor

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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.

Published

2020-11-16T12:15:14.557

Last Modified

2024-11-21T05:39:39.220

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 4.8 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:P/I:P/A:N

Access Vector: NETWORK
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.0

Impact Score

4.9

Weaknesses

Type: Secondary
CWE-310
Type: Primary
CWE-327

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	amazon	aws_encryption_sdk	< 2.0.0	Yes

References

https://aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-and-key-commitment/ Vendor Advisory ([email protected])
https://github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf Exploit, Mitigation, Third Party Advisory ([email protected])
https://aws.amazon.com/blogs/security/improved-client-side-encryption-explicit-keyids-and-key-commitment/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/google/security-research/security/advisories/GHSA-wqgp-vphw-hphf Exploit, Mitigation, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)