閉める
閉める
明日に向けたネットワーク
明日に向けたネットワーク
サポートするアプリケーションとユーザー向けに設計された、より高速で、より安全で、回復力のあるネットワークへの道を計画します。
          Netskopeを体験しませんか?
          Get Hands-on With the Netskope Platform
          Here's your chance to experience the Netskope One single-cloud platform first-hand. Sign up for self-paced, hands-on labs, join us for monthly live product demos, take a free test drive of Netskope Private Access, or join us for a live, instructor-led workshops.
            SSEのリーダー。 現在、シングルベンダーSASEのリーダーです。
            SSEのリーダー。 現在、シングルベンダーSASEのリーダーです。
            Netskope、2024年Gartner®社のシングルベンダーSASEのマジック・クアドラントでリーダーの1社の位置付けと評価された理由をご確認ください。
              ダミーのためのジェネレーティブAIの保護
              ダミーのためのジェネレーティブAIの保護
              Learn how your organization can balance the innovative potential of generative AI with robust data security practices.
                Modern data loss prevention (DLP) for Dummies eBook
                最新の情報漏えい対策(DLP)for Dummies
                Get tips and tricks for transitioning to a cloud-delivered DLP.
                  SASEダミーのための最新のSD-WAN ブック
                  Modern SD-WAN for SASE Dummies
                  遊ぶのをやめる ネットワークアーキテクチャに追いつく
                    リスクがどこにあるかを理解する
                    Advanced Analytics transforms the way security operations teams apply data-driven insights to implement better policies. With Advanced Analytics, you can identify trends, zero in on areas of concern and use the data to take action.
                        レガシーVPNを完全に置き換えるための6つの最も説得力のあるユースケース
                        レガシーVPNを完全に置き換えるための6つの最も説得力のあるユースケース
                        Netskope One Private Access is the only solution that allows you to retire your VPN for good.
                          Colgate-Palmoliveは、スマートで適応性のあるデータ保護により「知的財産」を保護します
                          Colgate-Palmoliveは、スマートで適応性のあるデータ保護により「知的財産」を保護します
                            Netskope GovCloud
                            NetskopeがFedRAMPの高認証を達成
                            政府機関の変革を加速するには、Netskope GovCloud を選択してください。
                              Let's Do Great Things Together
                              Netskopeのパートナー中心の市場開拓戦略により、パートナーは企業のセキュリティを変革しながら、成長と収益性を最大化できます。
                                Netskopeソリューション
                                Netskope Cloud Exchange
                                Netskope Cloud Exchange (CE) provides customers with powerful integration tools to leverage investments across their security posture.
                                  Netskopeテクニカルサポート
                                  Netskopeテクニカルサポート
                                  クラウドセキュリティ、ネットワーキング、仮想化、コンテンツ配信、ソフトウェア開発など、多様なバックグラウンドを持つ全世界にいる有資格のサポートエンジニアが、タイムリーで質の高い技術支援を行っています。
                                    Netskopeの動画
                                    Netskopeトレーニング
                                    Netskopeのトレーニングは、クラウドセキュリティのエキスパートになるためのステップアップに活用できます。Netskopeは、お客様のデジタルトランスフォーメーションの取り組みにおける安全確保、そしてクラウド、Web、プライベートアプリケーションを最大限に活用するためのお手伝いをいたします。

                                      Microsoft CryptoAPI Spoofing (CVE-2020-0601)

                                      Jan 17 2020

                                      Trust Me…

                                      We’ve all gotten used to a trust model on the Internet, and it’s mostly worked. We trust we have a private connection to a website because of the HTTPS certificates presented by the server and verified by our browser. Our browsers are fairly good at warning us when there is a problem, like invalid certificates. So, we confidently send credit card numbers, bank account information, and other information over the Internet, knowing that these technologies will keep us safe.

                                      … or Not

                                      CVS-2020-0601 has turned our trust model upside down. Not because of the design of the crypto/certificate chain of SSL/HTTPS, but because an implementation of the certificate checking on some Windows systems is flawed, failing to detect invalid, spoofed certificates. 

                                      Like a fictitious face mask from Mission Impossible, attackers can easily spoof a valid certificate, presenting to you what looks like a valid certificate signed from a trusted authority, with no warnings, no errors from your browser.

                                      CVE-2020-0601

                                      On Tuesday, January 14, 2020, Microsoft issued a security update addressing several patches, including a fix for CVE-2020-0601, a critical vulnerability in the Microsoft CryptoAPI (crypt32.dll) discovered and reported by NSA. The fix ensures that the Windows CryptoAPI library completely and properly validates ECC certificates (commonly used in X.509 certificates).

                                      CVE-2020-0601 is a vulnerability in the Windows cryptographic library crypt32.dll, which implements many of the certificate and cryptographic messaging functions in the CryptoAPI, such as encrypting and decrypting data using digital certificates and validating the Elliptic Curve Cryptography (ECC) certificates. 

                                      CVE-2020-0601, also referred to as CurveBall, is a spoofing vulnerability or flaw in the way the certificates are loaded without a proper verification of the explicit curve parameters in the certificates. This allows an attacker to supply his own generated X.509 certificates by using an “explicit parameters” option to set it.

                                      This affects Windows 10 endpoints and Windows Server 2016/2019, allowing spoofing of certificates used in trust validation:

                                      • HTTPS connections
                                      • Signed files and emails
                                      • Signed executable code processes

                                      From an adversarial context, Curveball X.509 cert chain validation is susceptible to:

                                      • MITM Attacks: HTTPS/SSL certificate authorities can be spoofed without being detected thereby allowing MITM attacks from a fake server which appears to have a validly signed HTTPS/SSL certificate.
                                      • Signed File/Malware Attack: Root certificate authorities like MicrosoftECCProductRootCertificateAuthority.cer can be spoofed without being detected thereby allowing malware to appear to be signed by a valid authority.

                                      Netskope Protection

                                      Netskope protects clients from HTTPS/SSL MITM attacks arising from this vulnerability through our Next-Gen Secure Web Gateway. Even if you are using vulnerable software and accessing a server that is trying to exploit this vulnerability, you will be protected. Netskope properly validates the server certificates, ensuring that the exploit never reaches the client.

                                      Recommendation

                                      We strongly recommended upgrading the machines to the latest security update provided by Microsoft.

                                      To verify whether you are vulnerable, our friends at Kudelski security have created a webpage with a POC.  If you are vulnerable, you will see a page with a “Hello World” message on it. If not, you will see no such message, only a blank page or a certificate error.

                                      author image
                                      Ashwin Vamshi
                                      Ashwin Vamshi is a Security Researcher with innate interest in targeted attacks and malwares using cloud services.
                                      Ashwin Vamshi is a Security Researcher with innate interest in targeted attacks and malwares using cloud services.

                                      Stay informed!

                                      Subscribe for the latest from the Netskope Blog