CVE-2023-32731

Advisory

Grpcio 1.53.0 includes a fix for a Connection Confusion vulnerability. When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame. This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests from the proxy being interpreted as containing headers from different proxy clients - leading to an information leak that can be used for privilege escalation or data exfiltration.
https://github.com/advisories/GHSA-cfgp-2977-2fmm

Affected package

Affected versions

Fixed versions

Vulnerability changelog

This vulnerability has no description

Resources

• https://pypi.org/project/grpcio
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-32731
• https://github.com/grpc/grpc/pull/32309
• https://github.com/grpc/grpc/pull/33005