CVE-2020-8622

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.

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.

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.

A flaw was found in bind. An assertion failure can occur when trying to verify a truncated response to a TSIG-signed request. The highest threat from this vulnerability is to system availability (CVE-2020-8622).

A flaw was found in bind. Updates to "Update-policy" rules of type "subdomain" are treated as if they were of type "zonesub" which allows updates to all parts of the zone along with the intended subdomain. The highest threat from this vulnerability is to data integrity (CVE-2020-8624).

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…

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…

These are all security issues fixed in the bind-9.16.20-1.4 package on the GA media of openSUSE Tumbleweed.

This update for bind fixes the following issues:

Bind was updated to version 9.11.22

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.

This upgrade also fixes the following security issues:

• 5481. [security] '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. (CVE-2020-8624 bsc#1175443)
• 5480. [security] 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. (CVE-2020-8623 bsc#1175443)
• 5476. [security] It was possible to trigger an assertion failure when verifying the response to a TSIG-signed request. (CVE-2020-8622 bsc#1175443)

• Suppress warning message about missing file. (bsc#1092283, bsc#1127583, bsc#1094236, bsc#1173983) Added /etc/bind.keys to NAMED_CONF_INCLUDE_FILES in /etc/sysconfig/named.

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…

This update for bind fixes the following issues:

• CVE-2020-8622: A truncated TSIG response can lead to an assertion failure (bsc#1175443).

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)

USN-4468-1 fixed a vulnerability in Bind. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

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)