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Security Advisories: GSA_kwCzR0hTQS1nNzYyLWg4NnctODc0Oc4AA8uP

BoringSSLAEADContext in Netty Repeats Nonces

Summary

BoringSSLAEADContext keeps track of how many OHTTP responses have been sent and uses this sequence number to calculate the appropriate nonce to use with the encryption algorithm.
Unfortunately, two separate errors combine which would allow an attacker to cause the sequence number to overflow and thus the nonce to repeat.

Details

  1. There is no overflow detection or enforcement of the maximum sequence value. (This is a missed requirement from the draft Chunked Oblivious OHTTP RFC and so should be inherited from the HPKE RFC 9180, Section 5.2).
  2. The sequence number (seq) is stored as 32-bit int which is relatively easy to overflow.

https://github.com/netty/netty-incubator-codec-ohttp/blob/1ddadb6473cd3be5491d114431ed4c1a9f316001/codec-ohttp-hpke-classes-boringssl/src/main/java/io/netty/incubator/codec/hpke/boringssl/BoringSSLAEADContext.java#L112-L114

Impact

If the BoringSSLAEADContext is used to encrypt more than 2^32 messages then the AES-GCM nonce will repeat.
Repeating a nonce with AES-GCM results in both confidentiality and integrity compromise of data encrypted with the associated key.

Permalink: https://github.com/advisories/GHSA-g762-h86w-8749
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1nNzYyLWg4NnctODc0Oc4AA8uP
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 6 months ago
Updated: 6 months ago


CVSS Score: 5.9
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N

Identifiers: GHSA-g762-h86w-8749, CVE-2024-36121
References: Repository: https://github.com/netty/netty-incubator-codec-ohttp
Blast Radius: 1.0

Affected Packages

maven:io.netty.incubator:netty-incubator-codec-ohttp
Affected Version Ranges: >= 0.0.3.Final, < 0.0.11.Final
Fixed in: 0.0.11.Final