CVE-2023-32731 Information leak in gRPC

2023-06-0910:54:08

CWE-440

Google

www.cve.org

grpc

http2

hpack

information leak

privilege escalation

data exfiltration

upgrade

security vulnerability

7.4 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

0.002 Low

EPSS

Percentile

56.4%

JSON

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

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "product": "gRPC",
    "repo": "https://github.com/grpc",
    "vendor": "Google",
    "versions": [
      {
        "lessThanOrEqual": "1.54",
        "status": "affected",
        "version": "1.53",
        "versionType": "custom"
      }
    ]
  }
]