A flaw was found in libnbd, due to a malicious Network Block Device (NBD), a protocol for accessing Block Devices such as hard disks over a Network. This issue may allow a malicious NBD server to cause a Denial of Service.

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

  - A flaw was found in libnbd, due to a malicious Network Block Device (NBD), a protocol for accessing Block     Devices such as hard disks over a Network. This issue may allow a malicious NBD server to cause a Denial     of Service. (CVE-2023-5871)

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

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2024-2204 advisory.

    - Fix assertion in ext-mode BLOCK_STATUS (CVE-2023-5871)       resolves: RHEL-15143

Tenable has extracted the preceding description block directly from the Oracle 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.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:2204 advisory.

    Network Block Device (NBD) is a protocol for accessing Block Devices (hard disks and disk-like devices)     over a Network. The libnbd is a userspace client library for writing NBD clients.

    Security Fix(es):

    * libnbd: Malicious NBD server may crash libnbd (CVE-2023-5871)

    * libnbd: Crash or misbehaviour when NBD server returns an unexpected block size (CVE-2023-5215)

    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 9.4 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 these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2023:4463-1 advisory.

  - Fix assertion in ext-mode BLOCK_STATUS (CVE-2023-5871) (CVE-2023-5871)

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 a vulnerability as referenced in the FEDORA-2023-00c130636a advisory.

    Fix assertion in ext-mode BLOCK_STATUS (CVE-2023-5871)

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

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

ID	Name	Product	Family	Severity
252170	Linux Distros Unpatched Vulnerability : CVE-2023-5871	Nessus	Misc.	medium
195057	Oracle Linux 9 : libnbd (ELSA-2024-2204)	Nessus	Oracle Linux Local Security Checks	medium
194778	RHEL 9 : libnbd (RHSA-2024:2204)	Nessus	Red Hat Local Security Checks	medium
185940	openSUSE 15 Security Update : libnbd (SUSE-SU-2023:4463-1)	Nessus	SuSE Local Security Checks	medium
185400	Fedora 39 : libnbd (2023-00c130636a)	Nessus	Fedora Local Security Checks	medium

Detections

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CVE-2023-5871

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