Vulnerability identifier: #VU80917

Vulnerability risk: Low

CVSSv3.1: 2.2 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8912

CWE-ID: CWE-327

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
S3 Crypto SDK
Other software / Other software solutions

Vendor:

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A local user can change the encryption algorithm of an object in the bucket, which can then allow them to change AES-GCM to AES-CTR.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://aws.amazon.com/blogs/developer/updates-to-the-amazon-s3-encryption-client/?s=09
http://github.com/google/security-research/security/advisories/GHSA-7f33-f4f5-xwgw

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.