CVE-2020-8929— Ciphertext integrity weakness in Tink
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
Unicode编码处理不恰当
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/google/tink/security/advisories/GHSA-g5vf-v6wf-7w2rx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2020-8929
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Same vendor: Google LLC
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V. Comments for CVE-2020-8929
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