CVE-2021-25220 (GCVE-0-2021-25220)
Vulnerability from cvelistv5
Published
2022-03-23 12:50
Modified
2024-09-16 17:08
Severity ?
6.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N
CWE
  • When using forwarders, bogus NS records supplied by, or via, those forwarders may be cached and used by named if it needs to recurse for any reason, causing it to obtain and pass on potentially incorrect answers. Some examples of configurations that will be vulnerable are: Resolvers using per zone or global forwarding with forward first (forward first is the default). Resolvers not using global forwarding, but with per-zone forwarding with either forward first (the default) or forward only. Resolvers configured with global forwarding along with zone statements that disable forwarding for part of the DNS namespace. Authoritative-only BIND 9 servers are not vulnerable to this flaw. BIND 9.11.0 -> 9.11.36 9.12.0 -> 9.16.26 9.17.0 -> 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -> 9.11.36-S1 9.16.8-S1 -> 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL.
Summary
BIND 9.11.0 -> 9.11.36 9.12.0 -> 9.16.26 9.17.0 -> 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -> 9.11.36-S1 9.16.8-S1 -> 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients.
References
Impacted products
Vendor Product Version
ISC BIND Version: Open Source Branch 9.11 9.11.0 through versions before 9.11.37
Version: Development Branch 9.17 BIND 9.17 all version
Version: Open Source Branch 9.12-16 9.12.0 through versions before 9.16.27
Version: Open Source Branch 9.18 9.18.0
Version: Supported Preview Branch 9.11-S 9.11.0-S through versions before 9.11.37-S
Version: Supported Preview Branch 9.16-S 9.16.0-S through versions before 9.16.27-S
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          "vendor": "ISC",
          "versions": [
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      "credits": [
        {
          "lang": "en",
          "value": "ISC would like to thank Xiang Li, Baojun Liu, and Chaoyi Lu from Network and Information Security Lab, Tsinghua University and Changgen Zou from Qi An Xin Group Corp. for discovering and reporting this issue."
        }
      ],
      "datePublic": "2022-03-16T00:00:00.000Z",
      "descriptions": [
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          "value": "BIND 9.11.0 -\u003e 9.11.36 9.12.0 -\u003e 9.16.26 9.17.0 -\u003e 9.18.0 BIND Supported Preview Editions: 9.11.4-S1 -\u003e 9.11.36-S1 9.16.8-S1 -\u003e 9.16.26-S1 Versions of BIND 9 earlier than those shown - back to 9.1.0, including Supported Preview Editions - are also believed to be affected but have not been tested as they are EOL. The cache could become poisoned with incorrect records leading to queries being made to the wrong servers, which might also result in false information being returned to clients."
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            "attackComplexity": "LOW",
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            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
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            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to the patched release most closely related to your current version of BIND:\n    BIND 9.11.37\n    BIND 9.16.27\n    BIND 9.18.1\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n    BIND 9.11.37-S1\n    BIND 9.16.27-S1"
        }
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      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "DNS forwarders - cache poisoning vulnerability",
      "workarounds": [
        {
          "lang": "en",
          "value": "If applicable, modify your configuration to either remove all forwarding or all possibility of recursion. Depending on your use-case, it may be possible to use other zone types to replace forward zones.\nActive exploits: We are not aware of any active exploits."
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    "datePublished": "2022-03-23T12:50:10.367Z",
    "dateReserved": "2021-01-15T00:00:00.000Z",
    "dateUpdated": "2024-09-16T17:08:54.143Z",
    "state": "PUBLISHED"
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