CVE-2022-30698

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.

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.

Unbound is a validating, recursive, caching DNS resolver. It is designed to be fast and lean and incorporates modern features based on open standards.To help increase online privacy, Unbound supports DNS-over-TLS which allows clients to encrypt their communication. Unbound is available for most platforms such as FreeBSD, OpenBSD, NetBSD, MacOS, Linux and Microsoft Windows.Unbound is a totally free, open source software under the BSD license. It doesn'tmake custom builds or provide specific features to paying customers only.

Security Fix(es):

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.(CVE-2022-30698)

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 rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.(CVE-2022-30699)

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

The following packages have been upgraded to a later upstream version: unbound (1.16.2). (BZ#2027735)

Security Fix(es):

• unbound: the novel ghost domain where malicious users to trigger continued resolvability of malicious domain names (CVE-2022-30698)

• unbound: novel ghost domain attack where malicious users to trigger continued resolvability of malicious domain names (CVE-2022-30699)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.7 Release Notes linked from the References section.

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

The following packages have been upgraded to a later upstream version: unbound (1.16.2). (BZ#2087120)

Security Fix(es):

• unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names (CVE-2022-30698)

• unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names (CVE-2022-30699)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 9.1 Release Notes linked from the References section.

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.

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

The following packages have been upgraded to a later upstream version: unbound (1.16.2). (BZ#2027735)

Security Fix(es):

• unbound: the novel ghost domain where malicious users to trigger continued resolvability of malicious domain names (CVE-2022-30698)
• unbound: novel ghost domain attack where malicious users to trigger continued resolvability of malicious domain names (CVE-2022-30699)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

The following packages have been upgraded to a later upstream version: unbound (1.16.2). (BZ#2087120)

Security Fix(es):

• unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names (CVE-2022-30698)
• unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names (CVE-2022-30699)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Advisory text to describe the update. Wrap lines at ~75 chars. Update to version 1.16.2 fixes many bugs (along with versions 1.13.1, 1.13.2, 1.14.0, 1.15.0, 1.16.0 and 1.16.1), and protects against CVE-2022-3069[89]

These are all security issues fixed in the libunbound8-1.16.2-1.1 package on the GA media of openSUSE Tumbleweed.

This update for unbound fixes the following issues:

unbound was updated to 1.20.0:

• A lot of bugfixes and added features. For a complete list take a look at the changelog located at: /usr/share/doc/packages/unbound/Changelog or https://www.nlnetlabs.nl/projects/unbound/download/

Some Noteworthy Changes:

• Removed DLV. The DLV has been decommisioned since unbound 1.5.4 and has been advised to stop using it since. The use of dlv options displays a warning.
• Remove EDNS lame procedure, do not re-query without EDNS after timeout.
• Add DNS over HTTPS
• libunbound has been upgraded to major version 8

Security Fixes:

• CVE-2023-50387: DNSSEC verification complexity can be exploited to exhaust CPU resources and stall DNS resolvers. [bsc#1219823]
• CVE-2023-50868: NSEC3 closest encloser proof can exhaust CPU. [bsc#1219826]
• CVE-2022-30698: Novel 'ghost domain names' attack by introducing subdomain delegations. [bsc#1202033]
• CVE-2022-30699: Novel 'ghost domain names' attack by updating almost expired delegation information. [bsc#1202031]
• CVE-2022-3204: NRDelegation attack leads to uncontrolled resource consumption (Non-Responsive Delegation Attack). [bsc#1203643]

Packaging Changes:

• Use prefixes instead of sudo in unbound.service
• Remove no longer necessary BuildRequires: libfstrm-devel and libprotobuf-c-devel

This update for unbound fixes the following issues:

unbound was updated to 1.20.0:

• A lot of bugfixes and added features. For a complete list take a look at the changelog located at: /usr/share/doc/packages/unbound/Changelog or https://www.nlnetlabs.nl/projects/unbound/download/

Some Noteworthy Changes:

• Removed DLV. The DLV has been decommisioned since unbound 1.5.4 and has been advised to stop using it since. The use of dlv options displays a warning.
• Remove EDNS lame procedure, do not re-query without EDNS after timeout.
• Add DNS over HTTPS
• libunbound has been upgraded to major version 8

Security Fixes:

• CVE-2023-50387: DNSSEC verification complexity can be exploited to exhaust CPU resources and stall DNS resolvers. [bsc#1219823]
• CVE-2023-50868: NSEC3 closest encloser proof can exhaust CPU. [bsc#1219826]
• CVE-2022-30698: Novel 'ghost domain names' attack by introducing subdomain delegations. [bsc#1202033]
• CVE-2022-30699: Novel 'ghost domain names' attack by updating almost expired delegation information. [bsc#1202031]
• CVE-2022-3204: NRDelegation attack leads to uncontrolled resource consumption (Non-Responsive Delegation Attack). [bsc#1203643]

Packaging Changes:

• Use prefixes instead of sudo in unbound.service
• Remove no longer necessary BuildRequires: libfstrm-devel and libprotobuf-c-devel

This update for unbound fixes the following issues:

unbound was updated to 1.20.0:

• A lot of bugfixes and added features. For a complete list take a look at the changelog located at: /usr/share/doc/packages/unbound/Changelog or https://www.nlnetlabs.nl/projects/unbound/download/

Some Noteworthy Changes:

• Removed DLV. The DLV has been decommisioned since unbound 1.5.4 and has been advised to stop using it since. The use of dlv options displays a warning.
• Remove EDNS lame procedure, do not re-query without EDNS after timeout.
• Add DNS over HTTPS
• libunbound has been upgraded to major version 8

Security Fixes:

• CVE-2023-50387: DNSSEC verification complexity can be exploited to exhaust CPU resources and stall DNS resolvers. [bsc#1219823]
• CVE-2023-50868: NSEC3 closest encloser proof can exhaust CPU. [bsc#1219826]
• CVE-2022-30698: Novel 'ghost domain names' attack by introducing subdomain delegations. [bsc#1202033]
• CVE-2022-30699: Novel 'ghost domain names' attack by updating almost expired delegation information. [bsc#1202031]
• CVE-2022-3204: NRDelegation attack leads to uncontrolled resource consumption (Non-Responsive Delegation Attack). [bsc#1203643]

Packaging Changes:

• Use prefixes instead of sudo in unbound.service
• Remove no longer necessary BuildRequires: libfstrm-devel and libprotobuf-c-devel

Xiang Li discovered that Unbound incorrectly handled delegation caching. A remote attacker could use this issue to keep rogue domain names resolvable long after they have been revoked.