// For flags

CVE-2020-8929

Ciphertext integrity weakness in Tink

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Un manejo inapropiado de caracteres Unicode no válidos en la implementación de Java Tink versiones anteriores a 1.5, permite a un atacante cambiar la parte del ID de un texto cifrado, lo que resulta en la creación de un segundo texto cifrado que puede descifrarse en el mismo texto plano. Esto puede ser un problema con el cifrado AEAD determinista con una sola clave y depender de un único texto cifrado por texto plano

*Credits: Peter Esbensen
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-02-12 CVE Reserved
  • 2020-10-19 CVE Published
  • 2023-05-26 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-176: Improper Handling of Unicode Encoding
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Google
Search vendor "Google"
Tink
Search vendor "Google" for product "Tink"
< 1.5
Search vendor "Google" for product "Tink" and version " < 1.5"
-
Affected