CVE-2020-8623 (GCVE-0-2020-8623)

Vulnerability from cvelistv5 – Published: 2020-08-21 20:50 – Updated: 2024-09-17 03:19
VLAI
Title
A flaw in native PKCS#11 code can lead to a remotely triggerable assertion failure in pk11.c
Summary
In BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker that can reach a vulnerable system with a specially crafted query packet can trigger a crash. To be vulnerable, the system must: * be running BIND that was built with "--enable-native-pkcs11" * be signing one or more zones with an RSA key * be able to receive queries from a possible attacker
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • If BIND is built with "--enable-native-pkcs11" then a specially crafted query for a zone signed with RSA can trigger an assertion failure. Affects BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition
Assigner
isc CNA under the mitre root
CNA scorecard A 95/100 over 33 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
ISC BIND9 Affected: 9.10.0 , < unspecified (custom)
Affected: unspecified , < 9.11.22 (custom)
Affected: 9.12.0 , < unspecified (custom)
Affected: unspecified , < 9.16.6 (custom)
Affected: 9.17.0 , < unspecified (custom)
Affected: unspecified , < 9.17.4 (custom)
Affected: 9.10.5-S1 , < Supported Preview* (custom)
guessed Create a notification for this product.
Date Public
2020-08-20 00:00
Credits
ISC would like to thank Lyu Chiy for bringing this vulnerability to our attention.
Show details on NVD website
To clipboard 

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            "url": "https://security.netapp.com/advisory/ntap-20200827-0003/"
          },
          {
            "source": "security-officer@isc.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://usn.ubuntu.com/4468-1/"
          },
          {
            "source": "security-officer@isc.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.debian.org/security/2020/dsa-4752"
          },
          {
            "source": "security-officer@isc.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.synology.com/security/advisory/Synology_SA_20_19"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://kb.isc.org/docs/cve-2020-8623"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2020/08/msg00053.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNKVY6AJKSJE/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7USSNCWTXEXP/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.gentoo.org/glsa/202008-19"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20200827-0003/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://usn.ubuntu.com/4468-1/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.debian.org/security/2020/dsa-4752"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.synology.com/security/advisory/Synology_SA_20_19"
          }
        ],
        "sourceIdentifier": "security-officer@isc.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-617"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-07T13:25:56+00:00",
      "cve": "CVE-2020-8623",
      "id": "CVE-2020-8623",
      "initial_release_date": "2020-08-20T00:00:00+00:00",
      "product_status:fixed": "627",
      "product_status:known_not_affected": "9",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "bind: remotely triggerable assertion failure in pk11.c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-8623.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-18T00:53:00Z",
      "cve": "CVE-2020-8623",
      "id": "CVE-2020-8623",
      "initial_release_date": "2023-02-15T04:01:09Z",
      "product_status:known_affected": "320",
      "product_status:known_not_affected": "156",
      "product_status:recommended": "997",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-8623",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2023/cve-2020-8623.json",
      "version": "39"
    }
  }
}


Solutions

CNA · isc
Upgrade to the patched release most closely related to your current version of BIND: BIND 9.11.22 BIND 9.16.6 BIND 9.17.4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. BIND 9.11.22-S1

Workarounds

CNA · isc
No workarounds known.

Exploits

CNA · isc
We are not aware of any active exploits.

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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.