CVE-2023-33953
Summary
| CVE | CVE-2023-33953 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2023-08-09 13:15:00 UTC |
| Updated | 2023-08-17 14:15:00 UTC |
| Description | gRPC contains a vulnerability that allows hpack table accounting errors could lead to unwanted disconnects between clients and servers in exceptional cases/ Three vectors were found that allow the following DOS attacks: - Unbounded memory buffering in the HPACK parser - Unbounded CPU consumption in the HPACK parser The unbounded CPU consumption is down to a copy that occurred per-input-block in the parser, and because that could be unbounded due to the memory copy bug we end up with an O(n^2) parsing loop, with n selected by the client. The unbounded memory buffering bugs: - The header size limit check was behind the string reading code, so we needed to first buffer up to a 4 gigabyte string before rejecting it as longer than 8 or 16kb. - HPACK varints have an encoding quirk whereby an infinite number of 0’s can be added at the start of an integer. gRPC’s hpack parser needed to read all of them before concluding a parse. - gRPC’s metadata overflow check was performed per frame, so that the following sequence of frames could cause infinite buffering: HEADERS: containing a: 1 CONTINUATION: containing a: 2 CONTINUATION: containing a: 3 etc… |
Risk And Classification
Problem Types: CWE-770
NVD Known Affected Configurations (CPE 2.3)
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Security Bulletins | Customer Care | Google Cloud | MISC | cloud.google.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 673423 EulerOS Security Update for grpc (EulerOS-SA-2023-3030)
- 673716 EulerOS Security Update for grpc (EulerOS-SA-2023-3007)
- 673873 EulerOS Security Update for grpc (EulerOS-SA-2024-1083)
- 673987 EulerOS Security Update for grpc (EulerOS-SA-2023-3300)
- 674009 EulerOS Security Update for grpc (EulerOS-SA-2023-3332)
- 674076 EulerOS Security Update for grpc (EulerOS-SA-2024-1059)