CVE-2023-41378 Calico Typha hangs during unclean TLS handshake

2023-11-0615:00:53

CWE-400

CWE-703

Tigera

www.cve.org

calico

typha

tls

handshake

denial of service

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

21.4%

JSON

In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is performed inside the main server handle for loop without any timeout allowing an unclean TLS handshake to block the main loop indefinitely while other connections will be idle waiting for that handshake to finish.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "product": "Typha",
    "vendor": "Calico",
    "versions": [
      {
        "lessThanOrEqual": "v3.26.2",
        "status": "affected",
        "version": "v3.26.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "v3.25.1",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      }
    ]
  },
  {
    "defaultStatus": "unaffected",
    "product": "Typha",
    "vendor": "Tigera",
    "versions": [
      {
        "lessThanOrEqual": "v3.17.1",
        "status": "affected",
        "version": "v3.17.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "v3.16.3",
        "status": "affected",
        "version": "v3.16.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "v3.15.3",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      }
    ]
  }
]