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cve[email protected]CVE-2022-30698
HistoryAug 01, 2022 - 3:15 p.m.

CVE-2022-30698

2022-08-0115:15:09
CWE-613
web.nvd.nist.gov
197
7
cve-2022-30698
nlnet labs unbound
security vulnerability
ghost domain names
dns resolver
nvd

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

6.4 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

45.3%

NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the โ€œghost domain namesโ€ attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unboundโ€™s delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.

Affected configurations

NVD
Node
nlnetlabsunboundRange<1.16.2
Node
fedoraprojectfedoraMatch35
OR
fedoraprojectfedoraMatch36

CNA Affected

[
  {
    "vendor": "NLnet Labs",
    "product": "Unbound",
    "versions": [
      {
        "version": "unspecified",
        "lessThanOrEqual": "1.16.1",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]

Social References

More

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

6.4 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

45.3%