CVE-2020-11080 Denial of service in nghttp2

2020-06-0300:00:00

CWE-707

GitHub_M

www.cve.org

3.7 Low

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

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

7.7 High

AI Score

Confidence

High

0.012 Low

EPSS

Percentile

85.5%

JSON

In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.

CNA Affected

[
  {
    "vendor": "nghttp2",
    "product": "nghttp2",
    "versions": [
      {
        "version": "< 1.41.0",
        "status": "affected"
      }
    ]
  }
]