Several vulnerabilities were discovered in BIND, a DNS server implementation.

  - CVE-2020-8619     It was discovered that an asterisk character in an empty     non terminal can cause an assertion failure, resulting     in denial of service.

  - CVE-2020-8622     Dave Feldman, Jeff Warren, and Joel Cunningham reported     that a truncated TSIG response can lead to an assertion     failure, resulting in denial of service.

  - CVE-2020-8623     Lyu Chiy reported that a flaw in the native PKCS#11 code     can lead to a remotely triggerable assertion failure,     resulting in denial of service.

  - CVE-2020-8624     Joop Boonen reported that update-policy rules of type     'subdomain' are enforced incorrectly, allowing updates     to all parts of the zone along with the intended     subdomain.

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

  - In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 ->     9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND     9 Supported Preview Edition, An attacker on the network     path for a TSIG-signed request, or operating the server     receiving the TSIG-signed request, could send a     truncated response to that request, triggering an     assertion failure, causing the server to exit.
    Alternately, an off-path attacker would have to     correctly guess when a TSIG-signed request was sent,     along with other characteristics of the packet and     message, and spoof a truncated response to trigger an     assertion failure, causing the server to     exit.(CVE-2020-8622)

  - A malicious actor who intentionally exploits this lack     of effective limitation on the number of fetches     performed when processing referrals can, through the     use of specially crafted referrals, cause a recursing     server to issue a very large number of fetches in an     attempt to process the referral. This has at least two     potential effects: The performance of the recursing     server can potentially be degraded by the additional     work required to perform these fetches, and The     attacker can exploit this behavior to use the recursing     server as a reflector in a reflection attack with a     high amplification factor.(CVE-2020-8616)

  - Using a specially-crafted message, an attacker may     potentially cause a BIND server to reach an     inconsistent state if the attacker knows (or     successfully guesses) the name of a TSIG key used by     the server. Since BIND, by default, configures a local     session key even on servers whose configuration does     not otherwise make use of it, almost all current BIND     servers are vulnerable. In releases of BIND dating from     March 2018 and after, an assertion check in tsig.c     detects this inconsistent state and deliberately exits.
    Prior to the introduction of the check the server would     continue operating in an inconsistent state, with     potentially harmful results.(CVE-2020-8617)

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 NewStart CGSL host, running version MAIN 4.06, has bind packages installed that are affected by multiple vulnerabilities:

  - Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an     inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the     server. Since BIND, by default, configures a local session key even on servers whose configuration does     not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating     from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately     exits. Prior to the introduction of the check the server would continue operating in an inconsistent     state, with potentially harmful results. (CVE-2020-8617)

  - A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches     performed when processing referrals can, through the use of specially crafted referrals, cause a recursing     server to issue a very large number of fetches in an attempt to process the referral. This has at least     two potential effects: The performance of the recursing server can potentially be degraded by the     additional work required to perform these fetches, and The attacker can exploit this behavior to use the     recursing server as a reflector in a reflection attack with a high amplification factor. (CVE-2020-8616)

  - In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the     BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating     the server receiving the TSIG-signed request, could send a truncated response to that request, triggering     an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to     correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and     message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.
    (CVE-2020-8622)

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	Published	Updated	Severity
139930	Debian DSA-4752-1 : bind9 - security update	Nessus	Debian Local Security Checks	8/28/2020	6/3/2021	medium
140830	EulerOS 2.0 SP3 : bind (EulerOS-SA-2020-2063)	Nessus	Huawei Local Security Checks	9/28/2020	2/19/2024	high
147339	NewStart CGSL MAIN 4.06 : bind Multiple Vulnerabilities (NS-SA-2021-0003)	Nessus	NewStart CGSL Local Security Checks	3/10/2021	1/11/2024	high
164584	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-5.19.1)	Nessus	Misc.	9/1/2022	4/18/2024	critical

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