p PatchFirst

CVE-2026-110310

CVE-2026-110310 · RSA PKCS#1 v1.5 padding oracle via legacy envelope key format downgrade in Amazon S3 Encryption Client for .NET

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack, the user can use a PKCS#1 v1.5 padding oracle to recover the RSA-wrapped envelope key and decrypt the object. To remediate this issue, we recommend that users upgrade to version 3.2.2 or 4.0.3. The 1.x and 2.x lines will not be patched, users of those lines need to migrate to 3.2.2 or 4.0.3.

CVSS 6.0 · Moyenne · EPSS 0,5%

Publication
Mise à jour

Produits et versions concernés

  • amazon.extensions.s3.encryption

    Versions du logiciel
    • ≥ 2.1.0, ≤ 2.*: Concernée (custom)
    • ≥ 3.0.0, ≤ 3.2.1: Concernée (custom)
    • ≥ 4.0.0, ≤ 4.0.2: Concernée (custom)

    Aucun correctif publié

Sources originales

Vérifiez votre serveur →