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      <title>CVE-2020-8911 — CBC padding oracle in AWS S3 Crypto SDK for GoLang</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2020-8911</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Google LLC AWS S3 Crypto SDK for GoLang&lt;/p&gt;
&lt;p&gt;A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target&amp;#39;s S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC&amp;#39;s ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Google LLC AWS S3 Crypto SDK for GoLang&lt;/p&gt;
&lt;p&gt;A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target&amp;#39;s S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC&amp;#39;s ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.&lt;/p&gt;</content:encoded>
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