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CVE-2020-8912— In-band key negotiation issue in AWS S3 Crypto SDK for GoLang

Quick assessment

Affected
Google LLC AWS S3 Crypto SDK for GoLang
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AWS S3 Crypto SDK V2之前版本中存在加密问题漏洞。该漏洞源于网络系统或产品未正确使用相关密码算法，导致内容未正确加密、弱加密、明文存储敏感信息等。

CVSS 2.5 · Low EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2020-8912

Vulnerability Information
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Vulnerability Title
In-band key negotiation issue in AWS S3 Crypto SDK for GoLang
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
AWS S3 Crypto SDK 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AWS S3 Crypto SDK V2之前版本中存在加密问题漏洞。该漏洞源于网络系统或产品未正确使用相关密码算法，导致内容未正确加密、弱加密、明文存储敏感信息等。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Google LLC AWS S3 Crypto SDK for GoLang stable ~ V1 -

II. Public POCs for CVE-2020-8912

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III. Intelligence Information for CVE-2020-8912

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Vendor Advisories for CVE-2020-8912 (1)

Other References for CVE-2020-8912 (1)

Same Patch Batch · Google LLC · 2020-08-11 · 3 CVEs total

CVE-2020-8918 6.3 MEDIUM TPM 1.2 key authorization values are vulnerable to a TPM transport eavesdropper
CVE-2020-8911 5.6 MEDIUM CBC padding oracle in AWS S3 Crypto SDK for GoLang

IV. Related Vulnerabilities

Same product: AWS S3 Crypto SDK for GoLang
Same vendor: Google LLC
Same weakness: CWE-327