Cryptographic Issues Affecting com.google.crypto.tink:tink package, versions [,1.5.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published16 Oct 2020
- disclosed16 Oct 2020
- creditUnknown
Introduced: 16 Oct 2020
CVE-2020-8929 (opens in a new tab)How to fix?
Upgrade com.google.crypto.tink:tink to version 1.5.0 or higher.
Overview
com.google.crypto.tink:tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.
Affected versions of this package are vulnerable to Cryptographic Issues. Under some circumstances it allowed attackers to change the key ID part of the ciphertext, resulting in the attacker creating a second ciphertext that will decrypt to the same plaintext. This can be a problem in particular in the case of encrypting with a deterministic AEAD with a single key, and relying on the fact that there is only a single valid ciphertext per plaintext.
No loss of confidentiality or loss of plaintext integrity occurs due to this problem, only ciphertext integrity is compromised.