CVE-2020-8621 Attempting QNAME minimization after forwarding can lead to an assertion failure in resolver.c

2020-08-2000:00:00

isc

www.cve.org

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

7.4 High

AI Score

Confidence

High

0.007 Low

EPSS

Percentile

80.6%

JSON

In BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3, If a server is configured with both QNAME minimization and ‘forward first’ then an attacker who can send queries to it may be able to trigger the condition that will cause the server to crash. Servers that ‘forward only’ are not affected.

CNA Affected

[
  {
    "product": "BIND9",
    "vendor": "ISC",
    "versions": [
      {
        "changes": [
          {
            "at": "9.16.6",
            "status": "unaffected"
          },
          {
            "at": "9.17.0",
            "status": "affected"
          },
          {
            "at": "9.17.4",
            "status": "unaffected"
          }
        ],
        "lessThan": "*",
        "status": "affected",
        "version": "9.14.0",
        "versionType": "custom"
      }
    ]
  }
]