Buffer overflow vulnerabilities exists in the DNS stub resolver library used by BSD, ISC BIND, and GNU glibc. Other systems that use DNS resolver code derived from ISC BIND may also be affected. An attacker who is able to control DNS responses could exploit arbitrary code or cause a denial of service on vulnerable systems.
The Domain Name System (DNS) provides name, address, and other information about Internet Protocol (IP) networks and devices. By issuing queries to and interpreting responses from DNS servers, IP-enabled network operating systems can access DNS information. When an IP network application needs to access or process DNS information, it calls functions in the stub resolver library, which may be part of the underlying network operating system. On BSD-based systems, DNS stub resolver functions are implemented in the system library libc. In ISC BIND, they are implemented in libbind, and on GNU/Linux-based systems, they are implemented in glibc.
The DNS resolver libraries on BSD-based systems (libc), ISC BIND (libbind), GNU/Linux (glibc), and possibly other systems that use code derived from ISC BIND contain buffer overflow vulnerabilities in the way the resolvers handle DNS responses. Quoting from FreeBSD Security Advisory FreeBSD-SA-02:28.resolv:
An attacker who is able to control DNS responses could exploit arbitrary code or cause a denial of service on vulnerable systems. The attacker would need to be able to spoof DNS responses or control a DNS server that provides responses to a vulnerable system. Any code executed by the attacker would run with the privileges of the process that called the vulnerable resolver function, potentially root.
The CERT/CC thanks PINE-CERT for reporting this vulnerability and The FreeBSD Project, the NetBSD Project, and David Conrad of Nominum for information used in this document.