NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic.

The remote Oracle Linux 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2024-11232 advisory.

    - Fix unbounded name compression could lead to Denial of Service (CVE-2024-8508)
    - Ensure group access correction reaches also updated configs (CVE-2024-1488)
    - Ensure only unbound group can change configuration (CVE-2024-1488)
    - Fix KeyTrap - Extreme CPU consumption in DNSSEC validator CVE-2023-50387
    - Fix Preparing an NSEC3 closest encloser proof can exhaust CPU resources CVE-2023-50868

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 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2024:11170 advisory.

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

    Security Fix(es):

    * unbound: Unbounded name compression could lead to Denial of Service (CVE-2024-8508)

    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.

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 remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2024:11232 advisory.

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

    Security Fix(es):

    * unbound: Unbounded name compression could lead to Denial of Service (CVE-2024-8508)

    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.

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.

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

    DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original     software developer, NLnet Labs) falls within the expected functionality and security controls of the     application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs     has no further information about the claim, and suggests that affected Red Hat customers refer to     available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was     found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption.
    This issue could allow an attacker with local access to provide specially crafted input, potentially     causing the application to crash or allowing arbitrary code execution. This could result in a denial of     service or unauthorized actions on the system.(CVE-2024-43168)

    NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with     very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very     large RRsets can cause Unbound to spend a considerable time applying name compression to downstream     replies. This can lead to degraded performance and eventually denial of service in well orchestrated     attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially     crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will     try to apply name compression which was an unbounded operation that could lock the CPU until the whole     packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression     calculations it is willing to do per packet. Packets that need more compression will result in semi-     compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long.
    This change should not affect normal DNS traffic.(CVE-2024-8508)

    The DNS protocol in RFC 1035 and updates allows remote attackers to cause a denial of service (resource     consumption) by arranging for DNS queries to be accumulated for seconds, such that responses are later     sent in a pulsing burst (which can be considered traffic amplification in some cases), aka the 'DNSBomb'     issue.(CVE-2024-33655)

Tenable has extracted the preceding description block directly from the EulerOS unbound 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 installation on the remote host is affected by the following vulnerabilities :

    NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with     very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very     large RRsets can cause Unbound to spend a considerable time applying name compression to downstream     replies. This can lead to degraded performance and eventually denial of service in well orchestrated     attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially     crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will     try to apply name compression which was an unbounded operation that could lock the CPU until the whole     packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression     calculations it is willing to do per packet. Packets that need more compression will result in semi-     compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long.
    This change should not affect normal DNS traffic.(CVE-2024-8508)

    A DNSBomb flaw was found in the unbound package. The DNSBomb attack works by sending low-rate spoofed     queries for a malicious zone to Unbound. By controlling the delay of the malicious authoritative answers,     Unbound slowly accumulates pending answers for the spoofed addresses. When the authoritative answers     become available to Unbound at the same time, Unbound starts serving all the accumulated queries. This     results in large-sized, concentrated response bursts to the spoofed addresses.(CVE-2024-33655)

Tenable has extracted the preceding description block directly from the EulerOS unbound 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 vim packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    The UNIX editor Vim prior to version 9.1.0678 has a use-after-free error in argument list handling. When     adding a new file to the argument list, this triggers `Buf*` autocommands. If in such an autocommand the     buffer that was just opened is closed (including the window where it is shown), this causes the window     structure to be freed which contains a reference to the argument list that we are actually modifying. Once     the autocommands are completed, the references to the window and argument list are no longer valid and as     such cause an use-after-free. Impact is low since the user must either intentionally add some unusual     autocommands that wipe a buffer during creation (either manually or by sourcing a malicious plugin), but     it will crash Vim. The issue has been fixed as of Vim patch v9.1.0678.(CVE-2024-43374)

    Vim is an improved version of the unix vi text editor. When flushing the typeahead buffer, Vim moves the     current position in the typeahead buffer but does not check whether there is enough space left in the     buffer to handle the next characters.  So this may lead to the tb_off position within the typebuf variable     to point outside of the valid buffer size, which can then later lead to a heap-buffer overflow in e.g.
    ins_typebuf(). Therefore, when flushing the typeahead buffer, check if there is enough space left before     advancing the off position. If not, fall back to flush current typebuf contents. It's not quite clear yet,     what can lead to this situation. It seems to happen when error messages occur (which will cause Vim to     flush the typeahead buffer) in comnination with several long mappgins and so it may eventually move the     off position out of a valid buffer size. Impact is low since it is not easily reproducible and requires to     have several mappings active and run into some error condition. But when this happens, this will cause a     crash. The issue has been fixed as of Vim patch v9.1.0697. Users are advised to upgrade. There are no     known workarounds for this issue.(CVE-2024-43802)

    Vim is an open source, command line text editor. A use-after-free was found in Vim  9.1.0764. When     closing a buffer (visible in a window) a BufWinLeave auto command can cause an use-after-free if this auto     command happens to re-open the same buffer in a new split window. Impact is low since the user must have     intentionally set up such a strange auto command and run some buffer unload commands. However this may     lead to a crash. This issue has been addressed in version 9.1.0764 and all users are advised to upgrade.
    There are no known workarounds for this vulnerability.(CVE-2024-47814)

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

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

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-a5d6cd9f0a advisory.

    Fixed builds on F41. Fixes  CVE-2024-8508

    - https://github.com/NLnetLabs/unbound/releases/tag/release-1.21.1


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

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

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-3952 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3952-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Daniel Leidert     November 14, 2024                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : unbound     Version        : 1.13.1-1+deb11u4     CVE ID         : CVE-2024-8508     Debian Bug     : 1083282

    A vulnerability has been discovered in unbound, a validating,     recursive, caching DNS resolver. Malicious upstreams responses with     very large RRsets can cause Unbound to spend a considerable time     applying name compression to downstream replies. This can lead to     degraded performance and eventually denial of service in well     orchestrated attacks. The vulnerability can be exploited by a malicious     actor querying Unbound for the specially crafted contents of a     malicious zone with very large RRsets.

    For Debian 11 bullseye, this problem has been fixed in version     1.13.1-1+deb11u4.

    We recommend that you upgrade your unbound packages.

    For the detailed security status of unbound please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/unbound

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

    Attachment:
    signature.asc     Description: This is a digitally signed message part

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

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

An update of the unbound package has been released.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 host has packages installed that are affected by a vulnerability as referenced in the USN-7080-1 advisory.

    Toshifumi Sakaguchi discovered that Unbound incorrectly handled name

    compression for large RRsets, which could lead to excessive CPU usage.

    An attacker could potentially use this issue to cause a denial of service by sending specially crafted DNS     responses.

Tenable has extracted the preceding description block directly from the Ubuntu 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 Fedora 39 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-2ba00c906c advisory.

    Fixed builds on F41. Fixes  CVE-2024-8508

    - https://github.com/NLnetLabs/unbound/releases/tag/release-1.21.1



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

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

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2024:3647-1 advisory.

    - CVE-2024-8508: Fixed unbounded name compression that could lead to denial of service (bsc#1231284)

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2024:3646-1 advisory.

    - CVE-2024-8508: Fixed unbounded name compression that could lead to denial of service (bsc#1231284)

Tenable has extracted the preceding description block directly from the SUSE 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 ALAS2-2024-2650 advisory.

    NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with     very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very     large RRsets can cause Unbound to spend a considerable time applying name compression to downstream     replies. This can lead to degraded performance and eventually denial of service in well orchestrated     attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially     crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will     try to apply name compression which was an unbounded operation that could lock the CPU until the whole     packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression     calculations it is willing to do per packet. Packets that need more compression will result in semi-     compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long.
    This change should not affect normal DNS traffic. (CVE-2024-8508)

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 version of unbound installed on the remote host is prior to 1.17.0-2. It is, therefore, affected by a vulnerability as referenced in the ALAS2UNBOUND-1.17-2024-003 advisory.

    NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with     very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very     large RRsets can cause Unbound to spend a considerable time applying name compression to downstream     replies. This can lead to degraded performance and eventually denial of service in well orchestrated     attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially     crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will     try to apply name compression which was an unbounded operation that could lock the CPU until the whole     packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression     calculations it is willing to do per packet. Packets that need more compression will result in semi-     compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long.
    This change should not affect normal DNS traffic. (CVE-2024-8508)

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 version of unbound installed on the remote host is prior to 1.13.1-3. It is, therefore, affected by a vulnerability as referenced in the ALAS2UNBOUND-2024-003 advisory.

    NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with     very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very     large RRsets can cause Unbound to spend a considerable time applying name compression to downstream     replies. This can lead to degraded performance and eventually denial of service in well orchestrated     attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially     crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will     try to apply name compression which was an unbounded operation that could lock the CPU until the whole     packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression     calculations it is willing to do per packet. Packets that need more compression will result in semi-     compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long.
    This change should not affect normal DNS traffic. (CVE-2024-8508)

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.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2024-719 advisory.

    NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with     very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very     large RRsets can cause Unbound to spend a considerable time applying name compression to downstream     replies. This can lead to degraded performance and eventually denial of service in well orchestrated     attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially     crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will     try to apply name compression which was an unbounded operation that could lock the CPU until the whole     packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression     calculations it is willing to do per packet. Packets that need more compression will result in semi-     compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long.
    This change should not affect normal DNS traffic. (CVE-2024-8508)

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 version of unbound installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2024-8508 advisory.

  - NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with     very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very     large RRsets can cause Unbound to spend a considerable time applying name compression to downstream     replies. This can lead to degraded performance and eventually denial of service in well orchestrated     attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially     crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will     try to apply name compression which was an unbounded operation that could lock the CPU until the whole     packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression     calculations it is willing to do per packet. Packets that need more compression will result in semi-     compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long.
    This change should not affect normal DNS traffic. (CVE-2024-8508)

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 FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 2368755b-83f6-11ef-8d2e-a04a5edf46d9 advisory.

    NLnet labs report:
    A vulnerability has been discovered in Unbound when handling                 replies with very large RRsets that Unbound needs to perform name                 compression for.
    Malicious upstreams responses with very large RRsets can cause                 Unbound to spend a considerable time applying name compression to                 downstream replies. This can lead to degraded performance and                 eventually denial of service in well orchestrated attacks.
    Unbound version 1.21.1 introduces a hard limit on the number of                 name compression calculations it is willing to do per packet.
                Packets that need more compression will result in semi-compressed                 packets or truncated packets, even on TCP for huge messages, to                 avoid locking the CPU for long.
    This change should not affect normal DNS traffic.

Tenable has extracted the preceding description block directly from the FreeBSD 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 Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-c07e065747 advisory.

    Fixes  CVE-2024-8508

    - https://github.com/NLnetLabs/unbound/releases/tag/release-1.21.1



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

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

ID	Name	Product	Family	Severity
213254	Oracle Linux 9 : unbound:1.16.2 (ELSA-2024-11232)	Nessus	Oracle Linux Local Security Checks	medium
213154	RHEL 9 : unbound (RHSA-2024:11170)	Nessus	Red Hat Local Security Checks	medium
213152	RHEL 9 : unbound:1.16.2 (RHSA-2024:11232)	Nessus	Red Hat Local Security Checks	medium
212650	EulerOS 2.0 SP11 : unbound (EulerOS-SA-2024-2988)	Nessus	Huawei Local Security Checks	medium
212623	EulerOS 2.0 SP12 : unbound (EulerOS-SA-2024-2943)	Nessus	Huawei Local Security Checks	medium
212609	EulerOS 2.0 SP12 : unbound (EulerOS-SA-2024-2959)	Nessus	Huawei Local Security Checks	medium
212608	EulerOS 2.0 SP11 : vim (EulerOS-SA-2024-2974)	Nessus	Huawei Local Security Checks	medium
211417	Fedora 41 : unbound (2024-a5d6cd9f0a)	Nessus	Fedora Local Security Checks	medium
211384	Debian dla-3952 : libunbound-dev - security update	Nessus	Debian Local Security Checks	medium
209810	Photon OS 5.0: Unbound PHSA-2024-5.0-0389	Nessus	PhotonOS Local Security Checks	medium
209809	Photon OS 4.0: Unbound PHSA-2024-4.0-0707	Nessus	PhotonOS Local Security Checks	medium
209525	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 : Unbound vulnerability (USN-7080-1)	Nessus	Ubuntu Local Security Checks	medium
209318	Fedora 39 : unbound (2024-2ba00c906c)	Nessus	Fedora Local Security Checks	medium
209201	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : unbound (SUSE-SU-2024:3647-1)	Nessus	SuSE Local Security Checks	medium
209195	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : unbound (SUSE-SU-2024:3646-1)	Nessus	SuSE Local Security Checks	medium
209144	Amazon Linux 2 : unbound (ALAS-2024-2650)	Nessus	Amazon Linux Local Security Checks	medium
209066	Amazon Linux 2 : unbound (ALASUNBOUND-1.17-2024-003)	Nessus	Amazon Linux Local Security Checks	medium
209064	Amazon Linux 2 : unbound (ALASUNBOUND-2024-003)	Nessus	Amazon Linux Local Security Checks	medium
208978	Amazon Linux 2023 : python3-unbound, unbound, unbound-anchor (ALAS2023-2024-719)	Nessus	Amazon Linux Local Security Checks	medium
208764	CBL Mariner 2.0 Security Update: unbound (CVE-2024-8508)	Nessus	MarinerOS Local Security Checks	medium
208232	FreeBSD : Unbound -- Denial of service attack (2368755b-83f6-11ef-8d2e-a04a5edf46d9)	Nessus	FreeBSD Local Security Checks	medium
208220	Fedora 40 : unbound (2024-c07e065747)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2024-8508

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium