The remote MiracleLinux 8 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2023-5872:03 advisory.

    * unbound: NRDelegation attack leads to uncontrolled resource consumption (Non-Responsive Delegation     Attack) (CVE-2022-3204)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2024:0027 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2022-3204:
    A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in     various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a     considerable number of non responsive nameservers. The attack starts by querying a resolver for a record     that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of     time/resources resolving records under a malicious delegation point where a considerable number of     unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that     continually look in the cache for resolved NS records in that delegation. This can lead to degraded     performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high     CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying     to resolve the record until hard limits are reached. Based on the nature of the attack and the replies,     different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance     when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and     limiting the number of times a delegation point can issue a cache lookup for missing records.

    CVE-2023-50387:
    Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote     attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the     KeyTrap issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the     protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG     records.

    CVE-2023-50868:
    The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped)     allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC     responses in a random subdomain attack, aka the NSEC3 issue. The RFC 5155 specification implies that an     algorithm must perform thousands of iterations of a hash function in certain situations.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the unbound packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in     various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a     considerable number of non responsive nameservers. The attack starts by querying a resolver for a record     that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of     time/resources resolving records under a malicious delegation point where a considerable number of     unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that     continually look in the cache for resolved NS records in that delegation. This can lead to degraded     performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high     CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying     to resolve the record until hard limits are reached. Based on the nature of the attack and the replies,     different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance     when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and     limiting the number of times a delegation point can issue a cache lookup for missing records.
    (CVE-2022-3204)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the unbound packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - 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)

  - A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in     various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a     considerable number of non responsive nameservers. The attack starts by querying a resolver for a record     that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of     time/resources resolving records under a malicious delegation point where a considerable number of     unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that     continually look in the cache for resolved NS records in that delegation. This can lead to degraded     performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high     CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying     to resolve the record until hard limits are reached. Based on the nature of the attack and the replies,     different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance     when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and     limiting the number of times a delegation point can issue a cache lookup for missing records.
    (CVE-2022-3204)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2022-2023-265 advisory.

    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)

    A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in     various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a     considerable number of non responsive nameservers. The attack starts by querying a resolver for a record     that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of     time/resources resolving records under a malicious delegation point where a considerable number of     unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that     continually look in the cache for resolved NS records in that delegation. This can lead to degraded     performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high     CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying     to resolve the record until hard limits are reached. Based on the nature of the attack and the replies,     different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance     when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and     limiting the number of times a delegation point can issue a cache lookup for missing records.
    (CVE-2022-3204)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the unbound package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in     various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a     considerable number of non responsive nameservers. The attack starts by querying a resolver for a record     that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of     time/resources resolving records under a malicious delegation point where a considerable number of     unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that     continually look in the cache for resolved NS records in that delegation. This can lead to degraded     performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high     CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying     to resolve the record until hard limits are reached. Based on the nature of the attack and the replies,     different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance     when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and     limiting the number of times a delegation point can issue a cache lookup for missing records.
    (CVE-2022-3204)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2023-2370 advisory.

    [1.16.2-3]
    - Fix NRDelegation attack leading to uncontrolled resource consumption       (CVE-2022-3204)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2023:2771 advisory.

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

    Security Fix(es):

    * unbound: NRDelegation attack leads to uncontrolled resource consumption (Non-Responsive Delegation     Attack) (CVE-2022-3204)

    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 Red Hat Enterprise Linux 8.8 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of unbound installed on the remote host is prior to 1.7.3-15. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2024-2467 advisory.

    A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in     various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a     considerable number of non responsive nameservers. The attack starts by querying a resolver for a record     that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of     time/resources resolving records under a malicious delegation point where a considerable number of     unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that     continually look in the cache for resolved NS records in that delegation. This can lead to degraded     performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high     CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying     to resolve the record until hard limits are reached. Based on the nature of the attack and the replies,     different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance     when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and     limiting the number of times a delegation point can issue a cache lookup for missing records.
    (CVE-2022-3204)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in     various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a     considerable number of non responsive nameservers. The attack starts by querying a resolver for a record     that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of     time/resources resolving records under a malicious delegation point where a considerable number of     unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that     continually look in the cache for resolved NS records in that delegation. This can lead to degraded     performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high     CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying     to resolve the record until hard limits are reached. Based on the nature of the attack and the replies,     different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance     when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and     limiting the number of times a delegation point can issue a cache lookup for missing records.
    (CVE-2022-3204)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
293454	MiracleLinux 8 : unbound-1.16.2-5.el8 (AXSA:2023-5872:03)	Nessus	Miracle Linux Local Security Checks	2026/1/20	2026/1/20	high
236285	Alibaba Cloud Linux 3 : 0027: unbound (ALINUX3-SA-2024:0027)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	high
169859	EulerOS Virtualization 2.10.1 : unbound (EulerOS-SA-2023-1156)	Nessus	Huawei Local Security Checks	2023/1/11	2023/1/11	high
169870	EulerOS Virtualization 2.9.1 : unbound (EulerOS-SA-2023-1206)	Nessus	Huawei Local Security Checks	2023/1/11	2023/1/11	medium
170611	Amazon Linux 2022 : python3-unbound, unbound, unbound-anchor (ALAS2022-2023-265)	Nessus	Amazon Linux Local Security Checks	2023/1/25	2024/12/11	medium
175172	EulerOS Virtualization 3.0.2.0 : unbound (EulerOS-SA-2023-1730)	Nessus	Huawei Local Security Checks	2023/5/7	2023/5/7	high
175680	Oracle Linux 9 : unbound (ELSA-2023-2370)	Nessus	Oracle Linux Local Security Checks	2023/5/15	2024/10/22	high
175834	RHEL 8 : unbound (RHSA-2023:2771)	Nessus	Red Hat Local Security Checks	2023/5/16	2025/3/6	high
190703	Amazon Linux 2 : unbound (ALAS-2024-2467)	Nessus	Amazon Linux Local Security Checks	2024/2/19	2024/12/11	high
252464	Linux Distros Unpatched Vulnerability : CVE-2022-3204	Nessus	Misc.	2025/8/20	2025/8/20	high

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