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Microsoft Resolves Padding Oracle Vulnerability in Azure Storage SDK

By Ionut Arghire on July 19, 2022

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As a part of its July 2022 Patch Tuesday fixes, Microsoft has launched an replace for the Azure Storage SDK, to deal with a padding oracle vulnerability in client-side encryption.

The Azure Storage SDK consists of the entire needed assets that Python, .NET, or Java builders must construct Azure purposes that leverage cloud computing assets.

The SDK helps client-side encryption with a customer-managed key that’s saved in Azure Key Vault or in a unique key retailer. The earlier SDK launch makes use of cipher block chaining (CBC) mode for the encryption.

Tracked as CVE-2022-30187, the safety bug was recognized within the SDK’s earlier implementation of CBC mode and will permit an attacker to “decrypt knowledge on the shopper facet and disclose the content material of the file or blob.”

Based on Microsoft, nonetheless, an attacker seeking to exploit the problem wants write entry to the blob and in addition wants to watch decryption failures.

“The attacker would wish to carry out 128 makes an attempt per byte of plain textual content to decrypt blob contents. We view placing this mixture of qualifiers collectively for an assault to be uncommon,” the tech large notes.

Moreover, Microsoft says that influence from this vulnerability is low, as solely a small set of consumers use this client-side encryption to “encrypt their knowledge on the shopper with a customer-managed key that’s maintained in Azure Key Vault or one other key retailer earlier than importing to Azure Storage.”

The vulnerability was mitigated with the discharge of a brand new model of Azure Storage SDK client-side encryption (v2), which grew to become typically out there on July 12, 2022. The brand new model makes use of AES-GCM for client-side encryption.

The tech large recommends that each one clients who require client-side encryption replace to the newly launched model, mentioning that the brand new launch allows clients to learn and write knowledge that has been encrypted with the earlier SDK model.

Nevertheless, the corporate additionally notes that, along with updating their code to make use of the brand new SDK and client-side encryption variations, clients must also think about migrating beforehand encrypted knowledge to the brand new client-side encryption model by “downloading it, reencrypting it, and importing it once more.”

Microsoft additionally underlines the truth that it isn’t conscious of this vulnerability being exploited in assaults, crediting Google for responsibly disclosing the vulnerability.

Associated: Microsoft Patch Tuesday: 84 Home windows Vulns, Together with Already-Exploited Zero-Day

Associated: DLL Hijacking Flaw Mounted in Microsoft Azure Web site Restoration

Associated: Microsoft Azure Vulnerability Allowed Code Execution, Information Theft

Associated: Azure Service Material Vulnerability Can Result in Cluster Takeover

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