CVE-2023-45288 HTTP/2 CONTINUATION flood in net/http

2024-04-0420:37:30

github.com

cve-2023-45288

http/2

continuation

net/http

hpack

maxheaderbytes

memory allocation

huffman-encoded data

AI Score

7.2

Confidence

Low

SSVC

Exploitation

none

Automatable

yes

Technical Impact

partial

JSON

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request’s headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:a:go_standard_library:net\\/http:*:*:*:*:*:*:*:*"
    ],
    "vendor": "go_standard_library",
    "product": "net\\/http",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "1.21.9",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "1.22.0-0",
        "lessThan": "1.22.2",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:2.3:a:golang:http2:*:*:*:*:*:*:*:*"
    ],
    "vendor": "golang",
    "product": "http2",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "0.23.0",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  }
]