Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

The remote Redhat Enterprise Linux 8 host has one or more packages installed that are affected by a vulnerability that has been acknowledged by the vendor but will not be patched.

  - unbound: uninitialized memory accesses leads to crash via a crafted NOTIFY query (CVE-2019-16866)

Note that Nessus has not tested for this issue but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

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 1.12.0,     and NLnet Labs NSD, up to and including version 4.3.3,     contain a local vulnerability that would allow for a     local symlink attack. When writing the PID file,     Unbound and NSD create the file if it is not there, or     open an existing file for writing. In case the file was     already present, they would follow symlinks if the file     happened to be a symlink instead of a regular file. An     additional chown of the file would then take place     after it was written, making the user Unbound/NSD is     supposed to run as the new owner of the file. If an     attacker has local access to the user Unbound/NSD runs     as, she could create a symlink in place of the PID file     pointing to a file that she would like to erase. If     then Unbound/NSD is killed and the PID file is not     cleared, upon restarting with root privileges,     Unbound/NSD will rewrite any file pointed at by the     symlink. This is a local vulnerability that could     create a Denial of Service of the system Unbound/NSD is     running on. It requires an attacker having access to     the limited permission user Unbound/NSD runs as and     point through the symlink to a critical file on the     system.(CVE-2020-28935)

  - Unbound before 1.9.4 accesses uninitialized memory,     which allows remote attackers to trigger a crash via a     crafted NOTIFY query. The source IP address of the     query must match an access-control     rule.(CVE-2019-16866)

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 version of the unbound packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - Unbound before 1.9.4 accesses uninitialized memory,     which allows remote attackers to trigger a crash via a     crafted NOTIFY query. The source IP address of the     query must match an access-control     rule.(CVE-2019-16866)

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 version of the unbound package installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - Unbound before 1.9.4 accesses uninitialized memory,     which allows remote attackers to trigger a crash via a     crafted NOTIFY query. The source IP address of the     query must match an access-control     rule.(CVE-2019-16866)

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.

Fix build on rhel/centos systems

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

CVE-2019-16866

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

An update of the unbound package has been released.

X41 D-Sec discovered that unbound, a validating, recursive, and caching DNS resolver, did not correctly process some NOTIFY queries.
This could lead to remote denial-of-service by application crash.

It was discovered that Unbound incorrectly handled certain NOTIFY queries. An attacker could possibly use this issue to cause a denial of service.

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

Unbound Security Advisories :

Due to an error in parsing NOTIFY queries, it is possible for Unbound to continue processing malformed queries and may ultimately result in a pointer dereference in uninitialized memory. This results in a crash of the Unbound daemon.

ID	Name	Product	Family	Severity
200015	RHEL 8 : unbound (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
196617	RHEL 8 : unbound (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
147670	EulerOS Virtualization 2.9.0 : unbound (EulerOS-SA-2021-1634)	Nessus	Huawei Local Security Checks	high
147617	EulerOS Virtualization 2.9.1 : unbound (EulerOS-SA-2021-1629)	Nessus	Huawei Local Security Checks	high
142323	EulerOS 2.0 SP9 : unbound (EulerOS-SA-2020-2441)	Nessus	Huawei Local Security Checks	high
142249	EulerOS 2.0 SP9 : unbound (EulerOS-SA-2020-2423)	Nessus	Huawei Local Security Checks	high
140969	EulerOS Virtualization for ARM 64 3.0.6.0 : unbound (EulerOS-SA-2020-2021)	Nessus	Huawei Local Security Checks	high
139989	EulerOS 2.0 SP8 : unbound (EulerOS-SA-2020-1886)	Nessus	Huawei Local Security Checks	high
130804	Fedora 30 : unbound (2019-e99b716a92)	Nessus	Fedora Local Security Checks	high
130775	Fedora 31 : unbound (2019-0418c12a36)	Nessus	Fedora Local Security Checks	high
130106	Photon OS 3.0: Unbound PHSA-2019-3.0-0035	Nessus	PhotonOS Local Security Checks	high
129985	Debian DSA-4544-1 : unbound - security update	Nessus	Debian Local Security Checks	high
129749	Ubuntu 19.04 : unbound vulnerability (USN-4149-1)	Nessus	Ubuntu Local Security Checks	high
129573	FreeBSD : unbound -- parsing vulnerability (108a4be3-e612-11e9-9963-5f1753e0aca0)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2019-16866

high

Tenable Plugins

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