Out-of-Bounds Write in AWS SDK for C++ Base64 Decoder

Executive Summary

This is an out-of-bounds write vulnerability in the Base64 decoder of the Amazon aws-sdk-cpp library. It occurs when crafted Base64-encoded input causes the decoder to write data beyond the allocated memory buffer, potentially leading to crashes or heap memory corruption in applications processing such input.

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Detection Guidance

This vulnerability is specific to the aws-sdk-cpp library and cannot be directly detected via network scans or system commands. Instead, check the version of aws-sdk-cpp installed on your system. If the version is below 1.11.862, the system is vulnerable.

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Impact Analysis

The vulnerability could cause application crashes or memory corruption when processing malicious Base64 input. While remote code execution hasn't been demonstrated, the flaw affects applications using the SDK's Base64 decoder through generated C++ service clients. Users should upgrade to version 1.11.862 or later to mitigate risks.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized memory corruption or crashes in applications processing Base64-encoded data. Such issues may lead to data integrity breaches or denial-of-service conditions, which are critical concerns under these regulations. However, no evidence suggests remote code execution, reducing but not eliminating compliance risks.

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Mitigation Strategies

Upgrade the aws-sdk-cpp library to version 1.11.862 or later. This version replaces the vulnerable Base64 decoder with one from aws-crt-cpp. Ensure any forked or derivative code also uses the updated library.

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