REDHAT-BUG-2214463
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. We recommend upgrading beyond the commit contained in https://github.com/grpc/grpc/pull/32309 https://github.com/grpc/grpc/pull/32309
Affected Software
Event History
Frequently Asked Questions
What is the severity of REDHAT-BUG-2214463?
The severity of REDHAT-BUG-2214463 is medium due to potential desynchronization issues affecting data integrity between gRPC endpoints.
How do I fix REDHAT-BUG-2214463?
To fix REDHAT-BUG-2214463, update to a version of gRPC that includes the patch for the header size exceeded error.
Which versions of gRPC are affected by REDHAT-BUG-2214463?
REDHAT-BUG-2214463 affects versions of gRPC up to commit 32309.
What systems are impacted by REDHAT-BUG-2214463?
Systems using gRPC for communication, particularly those with proxy and backend configurations, are impacted by REDHAT-BUG-2214463.
What is the main issue described in REDHAT-BUG-2214463?
REDHAT-BUG-2214463 describes a desynchronization of HPACK tables due to skipped parsing of HPACK frames when a header size exceeded error occurs.