CVE-2020-8622 A truncated TSIG response can lead to an assertion failure

2020-08-2000:00:00

isc

www.cve.org

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

7.1 High

AI Score

Confidence

High

0.004 Low

EPSS

Percentile

74.5%

JSON

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

CNA Affected

[
  {
    "product": "BIND9",
    "vendor": "ISC",
    "versions": [
      {
        "lessThan": "unspecified",
        "status": "affected",
        "version": "9.0.0",
        "versionType": "custom"
      },
      {
        "lessThan": "9.11.22",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      },
      {
        "lessThan": "unspecified",
        "status": "affected",
        "version": "9.12.0",
        "versionType": "custom"
      },
      {
        "lessThan": "9.16.6",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      },
      {
        "lessThan": "unspecified",
        "status": "affected",
        "version": "9.17.0",
        "versionType": "custom"
      },
      {
        "lessThan": "9.17.4",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      },
      {
        "changes": [
          {
            "at": "9.11.22-S1",
            "status": "unaffected"
          }
        ],
        "lessThan": "Supported Preview*",
        "status": "affected",
        "version": "9.9.3-S1",
        "versionType": "custom"
      }
    ]
  }
]