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CVE-2020-8911— CBC padding oracle 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 for GoLang 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 5.6 · Medium EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1056.003 · Web Portal Capture
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I. Basic Information for CVE-2020-8911

Vulnerability Information
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Vulnerability Title
CBC padding oracle in AWS S3 Crypto SDK for GoLang
Source: CVE Program / CVE List V5
Vulnerability Description
A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target's S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC's ability to manipulate the bytes of the next block and PKCS5 padding errors. 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:C/C:H/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 for GoLang 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AWS S3 Crypto SDK for GoLang 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-2020-8911

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III. Intelligence Information for CVE-2020-8911

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Vendor Advisories for CVE-2020-8911 (1)

Other References for CVE-2020-8911 (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-2020-8912 2.5 LOW In-band key negotiation issue 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