Exploitation Summary
EIP tracks 1 public exploit for CVE-2025-54887. PoCs published by shinigami-777.
AI-analyzed exploit summary This PoC demonstrates a brute-force attack on the authentication tag of JWE tokens in ruby-jwe <= 1.1.0, allowing arbitrary JWE forgery and decryption. It includes scripts to brute-force the tag and modify ciphertext to change decrypted content.
Description
jwe is a Ruby implementation of the RFC 7516 JSON Web Encryption (JWE) standard. In versions 1.1.0 and below, authentication tags of encrypted JWEs can be brute forced, which may result in loss of confidentiality for those JWEs and provide ways to craft arbitrary JWEs. This puts users at risk because JWEs can be modified to decrypt to an arbitrary value, decrypted by observing parsing differences and the GCM internal GHASH key can be recovered. Users are affected by this vulnerability even if they do not use an AES-GCM encryption algorithm for their JWEs. As the GHASH key may have been leaked, users must rotate the encryption keys after upgrading. This issue is fixed in version 1.1.1.
Exploits (1)
This PoC demonstrates a brute-force attack on the authentication tag of JWE tokens in ruby-jwe <= 1.1.0, allowing arbitrary JWE forgery and decryption. It includes scripts to brute-force the tag and modify ciphertext to change decrypted content.
References (2)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N