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CVE-2020-8929— Ciphertext integrity weakness in Tink

Quick assessment

Affected
Google LLC Tink
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.

Tink是美国谷歌（Google）的一个多语言跨平台的提供加密 API 的一个开发库。 Tink 1.5之前版本存在安全漏洞，该漏洞源于对无效unicode字符的错误处理，攻击者可利用该漏洞更改密文的ID部分，这将导致创建第二个密文，该密文可以解密为相同的明文。这可能是使用单个密钥加密确定性AEAD时的一个问题，并且依赖于每明文唯一的密文。

CVSS 5.3 · Medium EPSS 0.46% · P40

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2020-8929

Vulnerability Information
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Vulnerability Title
Ciphertext integrity weakness in Tink
Source: CVE Program / CVE List V5
Vulnerability Description
A mis-handling of invalid unicode characters in the Java implementation of Tink versions prior to 1.5 allows an attacker to change the ID part of a ciphertext, which result in the creation of a second ciphertext that can decrypt to the same plaintext. This can be a problem with encrypting deterministic AEAD with a single key, and rely on a unique ciphertext-per-plaintext.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
Unicode编码处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Tink 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tink是美国谷歌（Google）的一个多语言跨平台的提供加密 API 的一个开发库。 Tink 1.5之前版本存在安全漏洞，该漏洞源于对无效unicode字符的错误处理，攻击者可利用该漏洞更改密文的ID部分，这将导致创建第二个密文，该密文可以解密为相同的明文。这可能是使用单个密钥加密确定性AEAD时的一个问题，并且依赖于每明文唯一的密文。
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 Tink stable ~ 1.5 -

II. Public POCs for CVE-2020-8929

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III. Intelligence Information for CVE-2020-8929

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Patches & Fixes for CVE-2020-8929 (1)

Vendor Advisories for CVE-2020-8929 (1)

IV. Related Vulnerabilities

Same product: Tink
Same vendor: Google LLC
Same weakness: CWE-176