CVE-2023-32067 0-byte UDP payload DoS in c-ares

2023-05-2522:49:55

CWE-400

GitHub_M

www.cve.org

c-ares

resolver

vulnerability

patched

1.19.1

udp

dos

CVSS3

7.5

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

AI Score

7.7

Confidence

High

EPSS

0.001

Percentile

48.7%

JSON

c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.

CNA Affected

[
  {
    "vendor": "c-ares",
    "product": "c-ares",
    "versions": [
      {
        "version": "< 1.19.1",
        "status": "affected"
      }
    ]
  }
]