Vulnerability Details : CVE-2020-8929
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.
Products affected by CVE-2020-8929
- cpe:2.3:a:google:tink:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-8929
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 21 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-8929
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
3.9
|
1.4
|
Google Inc. | |
|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
3.9
|
1.4
|
NIST |
CWE ids for CVE-2020-8929
-
The product does not properly handle when an input contains Unicode encoding.Assigned by: cve-coordination@google.com (Secondary)
References for CVE-2020-8929
-
https://github.com/google/tink/commit/93d839a5865b9d950dffdc9d0bc99b71280a8899
Fixing ciphertext malleability issue in Java caused by storing the ci… · google/tink@93d839a · GitHubPatch;Third Party Advisory
-
https://github.com/google/tink/security/advisories/GHSA-g5vf-v6wf-7w2r
Ciphertext Malleability Issue in Tink Java · Advisory · google/tink · GitHubPatch;Third Party Advisory
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