According to its self-reported version number, the installation of ISC BIND running on the remote name server is version 9.14.x prior to 9.16.6 or 9.17.x prior to 9.17.4. It is, therefore, affected by a denial of service (DoS). While query forwarding and QNAME minimization are mutually incompatible, BIND did sometimes allow QNAME minimization when continuing with recursion after 'forward first' did not result in an answer. In these cases the data used by QNAME minimization might be inconsistent, leading to an assertion failure. An unauthenticated, remote attacker can exploit this issue by triggering the condition to cause the server to crash. Servers that forward only are not affected.

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

This update for bind fixes the following issues :

BIND was upgraded to version 9.16.6 :

Note :

  - bind is now more strict in regards to DNSSEC. If queries     are not working, check for DNSSEC issues. For instance,     if bind is used in a namserver forwarder chain, the     forwarding DNS servers must support DNSSEC.

Fixing security issues :

  - CVE-2020-8616: Further limit the number of queries that     can be triggered from a request. Root and TLD servers     are no longer exempt from max-recursion-queries. Fetches     for missing name server. (bsc#1171740) Address records     are limited to 4 for any domain.

  - CVE-2020-8617: Replaying a TSIG BADTIME response as a     request could trigger an assertion failure.
    (bsc#1171740)

  - CVE-2019-6477: Fixed an issue where TCP-pipelined     queries could bypass the tcp-clients limit     (bsc#1157051).

  - CVE-2018-5741: Fixed the documentation (bsc#1109160).

  - CVE-2020-8618: It was possible to trigger an INSIST when     determining whether a record would fit into a TCP     message buffer (bsc#1172958).

  - CVE-2020-8619: It was possible to trigger an INSIST in     lib/dns/rbtdb.c:new_reference() with a particular zone     content and query patterns (bsc#1172958).

  - CVE-2020-8624: 'update-policy' rules of type 'subdomain'     were incorrectly treated as 'zonesub' rules, which     allowed keys used in 'subdomain' rules to update names     outside of the specified subdomains. The problem was     fixed by making sure 'subdomain' rules are again     processed as described in the ARM (bsc#1175443).

  - CVE-2020-8623: When BIND 9 was compiled with native     PKCS#11 support, it was possible to trigger an assertion     failure in code determining the number of bits in the     PKCS#11 RSA public key with a specially crafted packet     (bsc#1175443).

  - CVE-2020-8621: named could crash in certain query     resolution scenarios where QNAME minimization and     forwarding were both enabled (bsc#1175443).

  - CVE-2020-8620: It was possible to trigger an assertion     failure by sending a specially crafted large TCP DNS     message (bsc#1175443).

  - CVE-2020-8622: It was possible to trigger an assertion     failure when verifying the response to a TSIG-signed     request (bsc#1175443).

Other issues fixed :

  - Add engine support to OpenSSL EdDSA implementation.

  - Add engine support to OpenSSL ECDSA implementation.

  - Update PKCS#11 EdDSA implementation to PKCS#11 v3.0.

  - Warn about AXFR streams with inconsistent message IDs.

  - Make ISC rwlock implementation the default again.

  - Fixed issues when using cookie-secrets for AES and SHA2     (bsc#1161168)

  - Installed the default files in /var/lib/named and     created chroot environment on systems using     transactional-updates (bsc#1100369, fate#325524)

  - Fixed an issue where bind was not working in FIPS mode     (bsc#906079).

  - Fixed dependency issues (bsc#1118367 and bsc#1118368).

  - GeoIP support is now discontinued, now GeoIP2 is     used(bsc#1156205).

  - Fixed an issue with FIPS (bsc#1128220).

  - The liblwres library is discontinued upstream and is no     longer included.

  - Added service dependency on NTP to make sure the clock     is accurate when bind is starts (bsc#1170667,     bsc#1170713).

  - Reject DS records at the zone apex when loading master     files. Log but otherwise ignore attempts to add DS     records at the zone apex via UPDATE.

  - The default value of 'max-stale-ttl' has been changed     from 1 week to 12 hours.

  - Zone timers are now exported via statistics channel.

  - The 'primary' and 'secondary' keywords, when used as     parameters for 'check-names', were not processed     correctly and were being ignored.

  - 'rndc dnstap -roll <value>' did not limit the number of     saved files to <value>.

  - Add 'rndc dnssec -status' command.

  - Addressed a couple of situations where named could     crash.

  - Changed /var/lib/named to owner root:named and perms     rwxrwxr-t so that named, being a/the only member of the     'named' group has full r/w access yet cannot change     directories owned by root in the case of a compromized     named. [bsc#1173307, bind-chrootenv.conf]

  - Added '/etc/bind.keys' to NAMED_CONF_INCLUDE_FILES in     /etc/sysconfig/named to suppress warning message re     missing file (bsc#1173983).

  - Removed '-r /dev/urandom' from all invocations of     rndc-confgen (init/named system/lwresd.init     system/named.init in vendor-files) as this option is     deprecated and causes rndc-confgen to fail.
    (bsc#1173311, bsc#1176674, bsc#1170713)

  - /usr/bin/genDDNSkey: Removing the use of the -r option     in the call of /usr/sbin/dnssec-keygen as BIND now uses     the random number functions provided by the crypto     library (i.e., OpenSSL or a PKCS#11 provider) as a     source of randomness rather than /dev/random. Therefore     the -r command line option no longer has any effect on     dnssec-keygen. Leaving the option in genDDNSkey as to     not break compatibility. Patch provided by Stefan     Eisenwiener. [bsc#1171313]

  - Put libns into a separate subpackage to avoid file     conflicts in the libisc subpackage due to different     sonums (bsc#1176092).

  - Require /sbin/start_daemon: both init scripts, the one     used in systemd context as well as legacy sysv, make use     of start_daemon.

This update was imported from the SUSE:SLE-15:Update update project.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4468-1 advisory.

    Emanuel Almeida discovered that Bind incorrectly handled certain TCP payloads. A remote attacker could     possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected     Ubuntu 20.04 LTS. (CVE-2020-8620)

    Joseph Gullo discovered that Bind incorrectly handled QNAME minimization when used in certain     configurations. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a     denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-8621)

    Dave Feldman, Jeff Warren, and Joel Cunningham discovered that Bind incorrectly handled certain truncated     responses to a TSIG-signed request. A remote attacker could possibly use this issue to cause Bind to     crash, resulting in a denial of service. (CVE-2020-8622)

    Lyu Chiy discovered that Bind incorrectly handled certain queries. A remote attacker could possibly use     this issue to cause Bind to crash, resulting in a denial of service. (CVE-2020-8623)

    Joop Boonen discovered that Bind incorrectly handled certain subdomain update-policy rules. A remote     attacker granted privileges to change certain parts of a zone could use this issue to change other     contents of the zone, contrary to expectations. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04     LTS. (CVE-2020-8624)

Tenable has extracted the preceding description block directly from the Ubuntu 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 host is affected by the vulnerability described in GLSA-202008-19 (BIND: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in BIND. Please review the       CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

This update for bind fixes the following issues :

BIND was upgraded to version 9.16.6 :

Note :

bind is now more strict in regards to DNSSEC. If queries are not working, check for DNSSEC issues. For instance, if bind is used in a namserver forwarder chain, the forwarding DNS servers must support DNSSEC.

Fixing security issues :

CVE-2020-8616: Further limit the number of queries that can be triggered from a request. Root and TLD servers are no longer exempt from max-recursion-queries. Fetches for missing name server.
(bsc#1171740) Address records are limited to 4 for any domain.

CVE-2020-8617: Replaying a TSIG BADTIME response as a request could trigger an assertion failure. (bsc#1171740)

CVE-2019-6477: Fixed an issue where TCP-pipelined queries could bypass the tcp-clients limit (bsc#1157051).

CVE-2018-5741: Fixed the documentation (bsc#1109160).

CVE-2020-8618: It was possible to trigger an INSIST when determining whether a record would fit into a TCP message buffer (bsc#1172958).

CVE-2020-8619: It was possible to trigger an INSIST in lib/dns/rbtdb.c:new_reference() with a particular zone content and query patterns (bsc#1172958).

CVE-2020-8624: 'update-policy' rules of type 'subdomain' were incorrectly treated as 'zonesub' rules, which allowed keys used in 'subdomain' rules to update names outside of the specified subdomains.
The problem was fixed by making sure 'subdomain' rules are again processed as described in the ARM (bsc#1175443).

CVE-2020-8623: When BIND 9 was compiled with native PKCS#11 support, it was possible to trigger an assertion failure in code determining the number of bits in the PKCS#11 RSA public key with a specially crafted packet (bsc#1175443).

CVE-2020-8621: named could crash in certain query resolution scenarios where QNAME minimization and forwarding were both enabled (bsc#1175443).

CVE-2020-8620: It was possible to trigger an assertion failure by sending a specially crafted large TCP DNS message (bsc#1175443).

CVE-2020-8622: It was possible to trigger an assertion failure when verifying the response to a TSIG-signed request (bsc#1175443).

Other issues fixed :

Add engine support to OpenSSL EdDSA implementation.

Add engine support to OpenSSL ECDSA implementation.

Update PKCS#11 EdDSA implementation to PKCS#11 v3.0.

Warn about AXFR streams with inconsistent message IDs.

Make ISC rwlock implementation the default again.

Fixed issues when using cookie-secrets for AES and SHA2 (bsc#1161168)

Installed the default files in /var/lib/named and created chroot environment on systems using transactional-updates (bsc#1100369, fate#325524)

Fixed an issue where bind was not working in FIPS mode (bsc#906079).

Fixed dependency issues (bsc#1118367 and bsc#1118368).

GeoIP support is now discontinued, now GeoIP2 is used(bsc#1156205).

Fixed an issue with FIPS (bsc#1128220).

The liblwres library is discontinued upstream and is no longer included.

Added service dependency on NTP to make sure the clock is accurate when bind is starts (bsc#1170667, bsc#1170713).

Reject DS records at the zone apex when loading master files. Log but otherwise ignore attempts to add DS records at the zone apex via UPDATE.

The default value of 'max-stale-ttl' has been changed from 1 week to 12 hours.

Zone timers are now exported via statistics channel.

The 'primary' and 'secondary' keywords, when used as parameters for 'check-names', were not processed correctly and were being ignored.

'rndc dnstap -roll <value>' did not limit the number of saved files to <value>.

Add 'rndc dnssec -status' command.

Addressed a couple of situations where named could crash.

Changed /var/lib/named to owner root:named and perms rwxrwxr-t so that named, being a/the only member of the 'named' group has full r/w access yet cannot change directories owned by root in the case of a compromized named. [bsc#1173307, bind-chrootenv.conf]

Added '/etc/bind.keys' to NAMED_CONF_INCLUDE_FILES in /etc/sysconfig/named to suppress warning message re missing file (bsc#1173983).

Removed '-r /dev/urandom' from all invocations of rndc-confgen (init/named system/lwresd.init system/named.init in vendor-files) as this option is deprecated and causes rndc-confgen to fail.
(bsc#1173311, bsc#1176674, bsc#1170713)

/usr/bin/genDDNSkey: Removing the use of the -r option in the call of /usr/sbin/dnssec-keygen as BIND now uses the random number functions provided by the crypto library (i.e., OpenSSL or a PKCS#11 provider) as a source of randomness rather than /dev/random. Therefore the -r command line option no longer has any effect on dnssec-keygen. Leaving the option in genDDNSkey as to not break compatibility. Patch provided by Stefan Eisenwiener. [bsc#1171313]

Put libns into a separate subpackage to avoid file conflicts in the libisc subpackage due to different sonums (bsc#1176092).

Require /sbin/start_daemon: both init scripts, the one used in systemd context as well as legacy sysv, make use of start_daemon.

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

ID	Name	Product	Family	Published	Updated	Severity
139916	ISC BIND 9.14.x < 9.16.6, 9.17.x < 9.17.4 DoS	Nessus	DNS	8/27/2020	6/3/2021	high
141560	openSUSE Security Update : bind (openSUSE-2020-1699)	Nessus	SuSE Local Security Checks	10/20/2020	2/15/2024	medium
139770	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Bind vulnerabilities (USN-4468-1)	Nessus	Ubuntu Local Security Checks	8/24/2020	8/27/2024	medium
141839	openSUSE Security Update : bind (openSUSE-2020-1701)	Nessus	SuSE Local Security Checks	10/23/2020	2/14/2024	medium
140067	GLSA-202008-19 : BIND: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	8/31/2020	6/3/2021	medium
143842	SUSE SLED15 / SLES15 Security Update : bind (SUSE-SU-2020:2914-1)	Nessus	SuSE Local Security Checks	12/9/2020	5/11/2022	medium

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