Security context

What an agent needs to avoid regressing past fixes and find the next vuln in this repo.

aws/mcp-proxy-for-aws

              main @ e0264a9
            

Fixes

CVEs

HIGH

Peak severity

Highlights

Information Disclosure: 2 prior fixes. Scrutinize any change in this area.

mcp_proxy_for_aws/sigv4_helper.py: most-fixed (2 issues). Treat as high-risk during review.

1 high-severity fix in this history; regressions here are high-impact.

Recurring patterns

The bug types that recur here, drawn from past fixes, not open vulnerabilities.

Cleartext Transmission of Sensitive Information: The client could transmit highly sensitive AWS SigV4 authentication credentials over unencrypted HTTP, allowing on-path attackers to intercept them. Enforcing HTTPS on remote connections is critical to mitigate this transport risk.

Auth Bypass: Failure to validate read-only constraints on tool-execution call requests allowed write operations to execute when read-only mode was active, bypassing intended access controls.

Denial of Service: Lack of termination limits during connection failures triggered infinite recursion during network drops, causing a denial of service. Implementations must enforce strict connection retry limits.