Description
It's possible for a gRPC client communicating with a HTTP/2 proxy to poison the HPACK table between the proxy and the backend such that other clients see failed requests. It's also possible to use this vulnerability to leak other clients HTTP header keys, but not values. This occurs because the error status for a misencoded header is not cleared between header reads, resulting in subsequent (incrementally indexed) added headers in the first request being poisoned until cleared from the HPACK table. Please update to a fixed version of gRPC as soon as possible. This bug has been fixed in 1.58.3, 1.59.5, 1.60.2, 1.61.3, 1.62.3, 1.63.2, 1.64.3, 1.65.4.
CVSS breakdown
CVSS 4.0
Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality (Vulnerable System)
None
Integrity (Vulnerable System)
None
Availability (Vulnerable System)
Low
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
None
Availability (Subsequent System)
Low
Affected products
- Google / gRPC1.53.0 – 1.53.0
- Google / gRPC1.53.1 – 1.53.1
- Google / gRPC1.53.2 – 1.53.2
- Google / gRPC1.54.0 – 1.54.0
- Google / gRPC1.54.1 – 1.54.1
- Google / gRPC1.54.3 – 1.54.3
- Google / gRPC1.55.0 – 1.55.0
- Google / gRPC1.55.1 – 1.55.1
- Google / gRPC1.55.3 – 1.55.3
- Google / gRPC1.55.4 – 1.55.4
- Google / gRPC1.56.0 – 1.56.0
- Google / gRPC1.56.1 – 1.56.1
- Google / gRPC1.56.2 – 1.56.2
- Google / gRPC1.56.3 – 1.56.3
- Google / gRPC1.56.4 – 1.56.4
- Google / gRPC1.57.0 – 1.57.0
- Google / gRPC1.57.1 – 1.57.1
- Google / gRPC1.58.0 – 1.58.0
- Google / gRPC1.58.1 – 1.58.1
- Google / gRPC1.58.2 – 1.58.2
- Google / gRPC1.59.0 – 1.59.0
- Google / gRPC1.59.1 – 1.59.1
- Google / gRPC1.59.2 – 1.59.2
- Google / gRPC1.59.3 – 1.59.3
- Google / gRPC1.59.4 – 1.59.4
- Google / gRPC1.60.0 – 1.60.0
- Google / gRPC1.60.1 – 1.60.1
- Google / gRPC1.61.0 – 1.61.0
- Google / gRPC1.61.1 – 1.61.1
- Google / gRPC1.62.0 – 1.62.0
- Google / gRPC1.61.2 – 1.61.2
- Google / gRPC1.62.1 – 1.62.1
- Google / gRPC1.62.2 – 1.62.2
- Google / gRPC1.63.0 – 1.63.0
- Google / gRPC1.63.1 – 1.63.1
- Google / gRPC1.64.0 – 1.64.0
- Google / gRPC1.64.1 – 1.64.1
- Google / gRPC1.64.2 – 1.64.2
- Google / gRPC1.65.0 – 1.65.0
- Google / gRPC1.65.1 – 1.65.1
- Google / gRPC1.65.2 – 1.65.2
- Google / gRPC1.65.3 – 1.65.3