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Debian: DSA-3904-1 Critical: BIND9 Authentication Bypass Issues

Clément Berthaux from Synaktiv discovered two vulnerabilities in BIND, a DNS server implementation. They allow an attacker to bypass TSIG authentication by sending crafted DNS packets to a server. . - ------------------------------------------------------------------------- Debian Security Advisory DSA-3904-1 This email address is being protected from spambots. You need JavaScript enabled to view it. https://www.debian.org/security/ Yves-Alexis Perez July 08, 2017 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : bind9 CVE ID : CVE-2017-3142 CVE-2017-3143 Debian Bug : 866564 Clément Berthaux from Synaktiv discovered two vulnerabilities in BIND, a DNS server implementation. They allow an attacker to bypass TSIG authentication by sending crafted DNS packets to a server. CVE-2017-3142 An attacker who is able to send and receive messages to an authoritative DNS server and who has knowledge of a valid TSIG key name may be able to circumvent TSIG authentication of AXFR requests via a carefully constructed request packet. A server that relies solely on TSIG keys for protection with no other ACL protection could be manipulated into: - providing an AXFR of a zone to an unauthorized recipient - accepting bogus NOTIFY packets CVE-2017-3143 An attacker who is able to send and receive messages to an authoritative DNS server and who has knowledge of a valid TSIG key name for the zone and service being targeted may be able to manipulate BIND into accepting an unauthorized dynamic update. For the oldstable distribution (jessie), these problems have been fixed in version 1:9.9.5.dfsg-9+deb8u12. For the stable distribution (stretch), these problems have been fixed in version 1:9.10.3.dfsg.P4-12.4. We recommend that you upgrade your bind9 packages. Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be foundat: https://www.debian.org/security/ Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it. . Important advisory DSA-3904-1 concerning vulnerabilities found in BIND9 that risk DNS authentication integrity. Update is strongly advised.. BIND9 Update,DNS Issues,Debian Advisory. . Severity: Critical. LinuxSecurity.com Team

Jul 08, 2017 •Critical Debian