Race condition in ISC BIND - CVE-2019-6471

Vulnerability identifier: #VU21568

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-6471

CWE-ID: CWE-362

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a race condition when processing DNS requests in dispatch.c. A remote attacker can send specially crafted DNS packets to the affected daemon, trigger a REQUIRE assertion failure and crash the DNS server.

ISC BIND
Anolis OS
Red Hat Enterprise Linux for x86_64
Slackware Linux
Opensuse
Fedora
bind (Alpine package)
dnsperf
dhcp
bind
bind-pkcs11
bind-libs-lite
bind-chroot
bind-devel
bind-export-devel
bind-export-libs
bind-libs
python3-bind
bind-license
bind-utils
bind-sdb-chroot
bind-sdb
bind-pkcs11-utils
bind-pkcs11-libs
bind-pkcs11-devel
bind-lite-devel
bind-dyndb-ldap

Install updates from vendor's website.

ISC BIND - addressed in versions 9.11.8, 9.11.8-S1, 9.12.4-P2, 9.14.3, 9.15.1
bind (Alpine package) - update to 9.11.8-r0
dnsperf - addressed in versions 2.3.0-1.fc29, 2.3.0-1.fc30, 2.3.2-1.fc29
dhcp - addressed in versions 4.3.6-32.fc29, 4.3.6-34.fc29, 4.3.6-35.fc30
bind - addressed in versions 9.11.8-1.fc29, 9.11.8-1.fc30, 9.11.10-1.fc29
bind-pkcs11 - update to 9.11.36-3
bind-libs-lite - update to 9.11.36-3
bind - update to 9.11.36-3
bind-chroot - update to 9.11.36-3
bind-devel - update to 9.11.36-3
bind-export-devel - update to 9.11.36-3
bind-export-libs - update to 9.11.36-3
bind-libs - update to 9.11.36-3
python3-bind - update to 9.11.36-3
bind-license - update to 9.11.36-3
bind-utils - update to 9.11.36-3
bind-sdb-chroot - update to 9.11.36-3
bind-sdb - update to 9.11.36-3
bind-pkcs11-utils - update to 9.11.36-3
bind-pkcs11-libs - update to 9.11.36-3
bind-pkcs11-devel - update to 9.11.36-3
bind-lite-devel - update to 9.11.36-3
bind-dyndb-ldap - addressed in versions 11.1-17.fc29, 11.1-17.fc30, 11.1-19.fc29

• https://kb.isc.org/docs/cve-2019-6471

• OpenSUSE Linux update for bind
• OpenSUSE Linux update for bind
• Denial of service in ISC Bind
• Slackware Linux update for bind
• Red Hat update for bind
• Race condition in bind (Alpine package)
• Anolis OS update for bind (Anolis OS 8.6)
• Fedora 29 update for bind, bind-dyndb-ldap, dhcp, dnsperf
• Fedora 30 update for bind, bind-dyndb-ldap, dhcp, dnsperf
• Fedora 29 update for bind, bind-dyndb-ldap, dhcp, dnsperf