Resource management error in ISC BIND - CVE-2019-6477

Vulnerability identifier: #VU22894

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-2019-6477

CWE-ID: CWE-399

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 incorrect implementation of TCP-pipelining feature in ISC BIND, aimed to limit the number of concurrent connections and protect the server from denial of service attacks. A remote attacker can initiate a TCP-pipelined connection with multiple queries that consume more resources than the server has been provisioned to handle and crash the server, when closing the connection.

ISC BIND
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Oracle Solaris
Slackware Linux
Opensuse
Fedora
bind9 (Debian package)
bind9 (Ubuntu package)
bind (Red Hat package) main
bind (Alpine package)
dnsperf
dhcp
bind
bind-dyndb-ldap
Data Computing Appliance (DCA)

Install updates from vendor's website.

ISC BIND - addressed in versions 9.11.13, 9.11.13-S1, 9.14.8, 9.15.6
bind9 (Debian package) - addressed in versions 1:9.10.3.dfsg.P4-12.3+deb9u6, 1:9.11.5.P4+dfsg-5.1+deb10u1
bind9 (Ubuntu package) - addressed in versions 1:9.11.3+dfsg-1ubuntu1.11, 1:9.11.5.P1+dfsg-1ubuntu2.6, 1:9.11.5.P4+dfsg-5.1ubuntu2.1
bind (Red Hat package) main - addressed in versions 9.11.4-16.P2.el7, 9.11.13-3.el8
bind (Alpine package) - update to 9.14.8-r0
dnsperf - addressed in versions 2.3.2-2.fc30, 2.3.2-2.fc31
Data Computing Appliance (DCA) - update to 4.3.0.0
dhcp - update to 4.3.6-38.fc30
bind - addressed in versions 9.11.13-2.fc30, 9.11.13-2.fc31
bind-dyndb-ldap - addressed in versions 11.1-20.fc30, 11.2-2.fc31

• https://kb.isc.org/docs/cve-2019-6477

• Denial of service in ISC BIND
• Slackware Linux update for bind
• Ubuntu update for Bind
• Oracle Solaris update for third party packages
• Red Hat Enterprise Linux 8 update for bind
• Debian update for bind9
• Resource management error in bind (Alpine package)
• OpenSUSE Linux update for bind
• OpenSUSE Linux update for bind
• Multiple vulnerabilities in Dell EMC Data Computing Appliance (DCA)
• Red Hat Enterprise Linux 7 update for bind
• Fedora 30 update for bind, bind-dyndb-ldap, dhcp, dnsperf
• Fedora 31 update for bind, bind-dyndb-ldap, dnsperf