TeamViewer Desktop Bypass Remote Login Vulnerability
TeamViewer Desktop through 14.7.1965 allows a bypass of remote-login access control because the same key is used for different customers' installations. It used a shared AES key for all installations since at least as far back as…
Gravité = CVSS. Probabilité = EPSS (FIRST). Exploitation = signaux publics : KEV, EUVD, rançongiciel, EPSS au-dessus de 10 %, accès sans compte.
Probabilité d’exploitation EPSS · FIRST
Signaux d’exploitation 2 / 5
- Catalogue KEV (CISA)03/11/2021
- EUVD exploitée (ENISA)03/11/2021
- Utilisée par des rançongicielsnon
- EPSS au-dessus de 10 %4,7 %
- Sans compte, par le réseaunon
Que faire
Corriger
Appliquer le correctif de l’éditeur dès qu’il est disponible.
Consigne de la CISA : Apply updates per vendor instructions.
En attendant
Retirer le service d’internet ou en filtrer l’accès, surveiller les journaux et chercher des traces de compromission.
Éditeurs (CRA)
Faille exploitée dans votre produit : alerte précoce à l’ENISA sous 24 h, puis notification sous 72 h (article 14 du Cyber Resilience Act). Le CRA expliqué
Description ENISA EUVD
TeamViewer Desktop through 14.7.1965 allows a bypass of remote-login access control because the same key is used for different customers' installations. It used a shared AES key for all installations since at least as far back as v7.0.43148, and used it for at least OptionsPasswordAES in the current version of the product. If an attacker were to know this key, they could decrypt protect information stored in the registry or configuration files of TeamViewer. With versions before v9.x , this allowed for attackers to decrypt the Unattended Access password to the system (which allows for remote login to the system as well as headless file browsing). The latest version still uses the same key for OptionPasswordAES but appears to have changed how the Unattended Access password is stored. While in most cases an attacker requires an existing session on a system, if the registry/configuration keys were stored off of the machine (such as in a file share or online), an attacker could then decrypt the required password to login to the system.
Texte de la source, en anglais.
Produits touchés
Paquets open source OSV
Bibliothèques touchées selon OSV, avec les versions corrigées.
Chronologie
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Publication
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Exploitation signalée (ENISA)
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Ajout au catalogue KEV
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Échéance de correction CISA