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Miggo AIRoot Cause AnalysisThe vulnerability exists in the install_packages method of the CodeInterpreter class within the bedrock-agentcore Python SDK. The security advisory points to an improper neutralization of argument delimiters, which is a form of command injection. By analyzing the patch that fixes the vulnerability, I identified the exact code change responsible. The patch is included in version 1.6.1 of the SDK. I compared the git tags for version 1.6.0 and 1.6.1 to find the fixing commit, which is ed953b58a96bd6d5ed1ca67792f6888cf04edf26. The commit message fix: replace blocklist with allowlist for install_packages() package validation confirms its purpose. The diff shows that in src/bedrock_agentcore/tools/code_interpreter_client.py, the install_packages method's validation logic was changed from a simple character blocklist (';', '&', '|', '', '$') to a much stricter regex-based allowlist for package names. The old, vulnerable code allowed malicious arguments to be passed to the underlying pip installcommand, leading to the vulnerability. Therefore, theCodeInterpreter.install_packages` function is the vulnerable function.
CodeInterpreter.install_packagessrc/bedrock_agentcore/tools/code_interpreter_client.py
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| bedrock-agentcore | pip | >= 1.1.3, < 1.6.1 | 1.6.1 |