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Contact Form 7

Plugin WordPress dengan 5 juta penginstalan memiliki kerentanan kritis

December 18, 2020 by Winnie the Pooh

Tim di balik plugin WordPress yang populer telah mengungkapkan kerentanan unggahan file penting dan telah merilis update untuk perbaikan.

Plugin yang rentan, Contact Form 7, memiliki lebih dari 5 juta penginstalan aktif yang membuat upgrade mendesak ini menjadi kebutuhan bagi pemilik situs WordPress di luar sana.

Minggu ini, proyek Contact Form 7 telah mengungkapkan kerentanan unggahan file yang tidak dibatasi (menunggu CVE) di plugin WordPress yang dapat memungkinkan penyerang untuk melewati perlindungan sanitasi nama file Contact Form 7 saat mengunggah file.

Penyerang dapat mengupload file yang dibuat dengan kode apapun di server yang rentan menggunakan plugin.

Kemudian, dengan mengeksploitasi kerentanan yang parah ini, file dapat dieksekusi sebagai skrip oleh penyerang untuk menjalankan kode di dalamnya.

“Contact Form 7 5.3.2 telah dirilis. Ini adalah rilis keamanan dan pemeliharaan yang mendesak. Kami sangat menganjurkan Anda untuk segera memperbaruinya,” tulisnya dalam sebuah pengunguman.

Kerentanan tersebut telah ditemukan dan dilaporkan oleh Jinson Varghese Behanan, seorang analis keamanan informasi di Astra Security.

Dalam versi yang rentan, plugin tidak menghapus karakter khusus dari nama file yang diunggah, termasuk karakter kontrol dan pemisah.

Hal ini berpotensi memungkinkan penyerang mengunggah nama file yang berisi ekstensi ganda, dipisahkan oleh karakter khusus atau non-printable, seperti file bernama “abc.php .jpg”.

Perbaikan yang dibuat oleh tim Contact Form 7, berisi validasi berbasis regex untuk menangkap kasus seperti ini:

Sumber: Bleeping Computer

Sumber: Bleeping Computer

Tagged With: Contact Form 7, Cybersecurity, Plugin, Upload Vulnerability, Vulnerability, WordPress, WordPress Plugin

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