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Insufficient Session Expiration Affecting unbound package, versions <1.9.0-2+deb10u3

0.0
medium

Snyk CVSS

    Attack Complexity Low
    Confidentiality High

    Threat Intelligence

    EPSS 0.14% (49th percentile)
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NVD
6.5 medium
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Red Hat
6.5 medium

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  • Snyk ID SNYK-DEBIAN10-UNBOUND-2964916
  • published 2 Aug 2022
  • disclosed 1 Aug 2022
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Introduced: 1 Aug 2022

CVE-2022-30698 Open this link in a new tab
CWE-613 Open this link in a new tab

How to fix?

Upgrade Debian:10 unbound to version 1.9.0-2+deb10u3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound package and not the unbound package as distributed by Debian. See How to fix? for Debian:10 relevant fixed versions and status.

NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the "ghost domain names" 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 Unbound'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.