TeamViewer Desktop Bypass Remote Login Vulnerability

高 7.0悪用確認済み（CISA KEV）CVE-2019-18988 · 07/02/2020 公開 · 17/06/2026 更新

TeamViewer Desktop Bypass Remote Login Vulnerability. 悪用が確認されています：CISA は 03/11/2021 にこの脆弱性を「既知の悪用された脆弱性（KEV）」カタログに追加しました。影響を受けるシステムは緊急に修正してください。

要点

CVE-2019-18988 は teamviewer (teamviewer) に影響する深刻度「高」 (CVSS 7.0) の脆弱性です。
実際に悪用されています：CISA が 03/11/2021 に KEV カタログへ追加しました。
今後30日間に悪用される確率（EPSS）：4.7%（全脆弱性の 91.8% より高い）。
修正版の情報はまだありません。参考情報のベンダー勧告を確認してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
teamviewer teamviewer	`≤ 14.7.1965`	修正版なし

概要

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.