CVE-2023-35945 Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec

2023-07-1320:41:15

CWE-400

GitHub_M

www.cve.org

envoy

http/2

memory leak

nghttp2

vulnerability

patch

dos

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

7.7 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

22.9%

JSON

Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving RST_STREAM immediately followed by the GOAWAY frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the GOAWAY frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken if connection is already marked for not sending more requests due to GOAWAY frame. The clean-up code is right after the return statement, causing memory leak. Denial of service through memory exhaustion. This vulnerability was patched in versions(s) 1.26.3, 1.25.8, 1.24.9, 1.23.11.

CNA Affected

[
  {
    "vendor": "envoyproxy",
    "product": "envoy",
    "versions": [
      {
        "version": ">= 1.26.0, < 1.26.3",
        "status": "affected"
      },
      {
        "version": ">= 1.25.0, < 1.25.8",
        "status": "affected"
      },
      {
        "version": ">= 1.24.0, < 1.24.9",
        "status": "affected"
      },
      {
        "version": ">= 1.23.0, < 1.23.11",
        "status": "affected"
      }
    ]
  }
]