CVE-2023-32731

Name	CVE-2023-32731
Description	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
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
grpc (PTS)	buster	1.16.1-1	fixed
	bullseye	1.30.2-3	fixed
	bookworm	1.51.1-3	fixed
	sid, trixie	1.51.1-4.1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
grpc	source	(unstable)	(not affected)

Notes

- grpc <not-affected> (Vulnerable code introduced later)
Introduced by: https://github.com/grpc/grpc/pull/32309#issuecomment-1589561295 (v1.53.0-pre1)
Fixed by: https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946 (v1.56.0-pre1)