CVE-2023-32731

Summary

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/33005 https://github.com/grpc/grpc/pull/33005

Affected Software

Weaknesses

• CWE-440: CWE-440: Expected Behavior Violation

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/grpc/grpc/pull/32309
• https://github.com/grpc/grpc/pull/33005

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/grpc/grpc/pull/32309
• https://github.com/grpc/grpc/pull/33005

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