Vulnerability Monitor

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CVE-2020-8912

A vulnerability in the in-band key negotiation exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. An attacker with write access to the targeted bucket can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR. Using this in combination with a decryption oracle can reveal the authentication key used by AES-GCM as decrypting the GMAC tag leaves the authentication key recoverable as an algebraic equation. It is recommended to update your SDK to V2 or later, and re-encrypt your files.

Published

2020-08-11T20:15:13.323

Last Modified

2024-11-21T05:39:40.560

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 2.5 (LOW)

CVSSv2 Vector

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

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

Exploitability Score

3.9

Impact Score

2.9

Weaknesses

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

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	amazon	aws_s3_crypto_sdk	< 2.0	Yes

References

https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 Vendor Advisory ([email protected])
https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw Exploit, Third Party Advisory ([email protected])
https://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)