CVE-2023-2911 Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0

2023-06-2116:26:36

isc

www.cve.org

cve-2023-2911

bind 9

resolver configuration

serve-stale-related lookups

stack overflow

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

0.002

Percentile

52.8%

JSON

If the recursive-clients quota is reached on a BIND 9 resolver configured with both stale-answer-enable yes; and stale-answer-client-timeout 0;, a sequence of serve-stale-related lookups could cause named to loop and terminate unexpectedly due to a stack overflow.
This issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through 9.18.15, 9.16.33-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.

CNA Affected

[
  {
    "vendor": "ISC",
    "product": "BIND 9",
    "versions": [
      {
        "version": "9.16.33",
        "lessThanOrEqual": "9.16.41",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "9.18.7",
        "lessThanOrEqual": "9.18.15",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "9.16.33-S1",
        "lessThanOrEqual": "9.16.41-S1",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "9.18.11-S1",
        "lessThanOrEqual": "9.18.15-S1",
        "status": "affected",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  }
]