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Apache Log4j

Hot Patch Log4Shell AWS Rentan Terhadap Pelarian Kontainer dan Eskalasi Hak Istimewa

April 20, 2022 by Eevee

Setelah Log4Shell, AWS merilis beberapa solusi hot patch yang memantau aplikasi Java yang rentan dan kontainer Java dan menambalnya dengan cepat. Setiap solusi sesuai dengan lingkungan yang berbeda, meliputi server mandiri, kluster Kubernetes, kluster Elastic Container Service (ECS) dan Fargate. Hot patch tidak eksklusif untuk lingkungan AWS dan dapat diinstal ke cloud atau lingkungan lokal apa pun.

Peneliti Unit 42 mengidentifikasi masalah keamanan yang parah dalam solusi patching ini dan bermitra dengan AWS untuk memulihkannya. Setelah menginstal layanan patch ke server atau cluster, setiap kontainer di lingkungan itu dapat memanfaatkannya untuk mengambil alih host yang mendasarinya. Misalnya, jika Anda menginstal hot patch ke kluster Kubernetes, setiap kontainer di kluster Anda sekarang dapat melarikan diri sampai Anda menonaktifkan hot patch-nya atau meningkatkan ke versi tetap. Selain kontainer, proses yang unprivilege juga dapat mengeksploitasi patch untuk meningkatkan hak istimewa dan mendapatkan eksekusi kode root.

Kontainer dapat lolos terlepas mereka menjalankan aplikasi Java atau host menjalankan Bottlerocket, distribusi Linux AWS yang mengeras untuk kontainer. Kontainer yang berjalan dengan nama pengguna atau sebagai pengguna non-root juga terpengaruh. Unit 42 menugaskan CVE-2021-3100, CVE-2021-3101, CVE-2022-0070 dan CVE-2022-0071 untuk melacak kerentanan.

AWS merilis versi tetap untuk setiap solusi patch panas pada 19 April:

  • Versi 1.1-16 dari paket log4j-cve-2021-44228-hotpatch, yang menggabungkan layanan hot patch.
  • Versi 1.1-16 dari kubernetes-log4j-cve-2021-44228-node-agent Daemonset, yang menginstal paket yang diperbarui.
  • Versi 1.02 dari Hotdog, solusi hot patch untuk host Bottlerocket berdasarkan kait Open Container Initiative (OCI).

Unit 42 menyarankan siapa saja yang menginstal salah satu hot patch ini untuk meningkatkan ke versi tetap. Perhatikan bahwa mulai dari 17 Desember 2021, paket JDK (instalasi Java) di Amazon Linux secara otomatis menginstal paket log4j-cve-2021-44228-hotpatch. Atau, pengguna yang yakin aplikasi mereka ditambal terhadap Log4Shell dapat menonaktifkan layanan hot patch mengikuti instruksi di bagian mitigasi di bawah ini.

Prisma Cloud mendeteksi paket patch panas dan akan memperingatkan host yang menjalankan versi rentan.

Selengkapnya: Paloalto Networks

Tagged With: Apache Log4j, AWS, Cloud, Container Escape, Hot Patch, privilege escalation, Vulnerability

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