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CVE-2020-8897— Robustness weakness in AWS KMS and Encryption SDKs

Quick assessment

Affected
Amazon AWS SDK
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.

Amazon AWS Encryption SDK是美国亚马逊（Amazon）公司的一个应用于加密的开发工具包。 AWS Encryption SDK存在安全漏洞，该漏洞源于SDK使用了AES-GCM（以及其他AEAD密码，例如AES-GCM-SIV或（X）ChaCha20Poly1305）的非提交属性来加密消息，攻击者可以制作独特的密文，该密文将解密为多个不同的密文。以下产品及版本受到影响：Java, Python, C and Javalcript SDK 2.0.0版本之前。

CVSS 4.8 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2020-8897

Vulnerability Information
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Vulnerability Title
Robustness weakness in AWS KMS and Encryption SDKs
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
加密问题
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon AWS Encryption SDK 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon AWS Encryption SDK是美国亚马逊（Amazon）公司的一个应用于加密的开发工具包。 AWS Encryption SDK存在安全漏洞，该漏洞源于SDK使用了AES-GCM（以及其他AEAD密码，例如AES-GCM-SIV或（X）ChaCha20Poly1305）的非提交属性来加密消息，攻击者可以制作独特的密文，该密文将解密为多个不同的密文。以下产品及版本受到影响：Java, Python, C and Javalcript SDK 2.0.0版本之前。
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
Amazon AWS SDK stable ~ 2.0.0 -

II. Public POCs for CVE-2020-8897

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III. Intelligence Information for CVE-2020-8897

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Vendor Advisories for CVE-2020-8897 (1)

Other References for CVE-2020-8897 (1)

IV. Related Vulnerabilities

Same product: AWS SDK
Same vendor: Amazon
Same weakness: CWE-310

V. Comments for CVE-2020-8897

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