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Vulnerability Note VU#572183
ISC BIND 4 contains buffer overflow in nslookupComplain()
OverviewThe Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) by the Internet Software Consortium (ISC). There is a buffer overflow vulnerability in BIND 4.9.x, which may allow remote intruders to gain access to systems running BIND. Although BIND 4.9.x is no longer officially maintained by ISC, various versions are still widely deployed on the Internet.
This vulnerability has been successfully exploited in a laboratory environment and presents a serious threat to the Internet infrastructure.
I. DescriptionA buffer overflow exists in the nslookupComplain() routine of several versions of ISC BIND. This vulnerability is reported to exist in all versions prior to BIND 4.9.8.
The vulnerable buffer is a locally defined character array used to build an error message intended for syslog. Attackers attempting to exploit this vulnerability could do so by sending a specially formatted DNS query to affected BIND servers. If properly constructed, this query could be used to disrupt the normal operation of the DNS server process, resulting in either denial of service or the execution of arbitrary code. If an attacker were able to execute code or commands, they would do so with the same privileges as the BIND process, which are typically superuser privileges.
It is important to note that other vendors of DNS software may be vulnerable to this problem as well. Please contact your vendor or check the vendor section of this document for further details.
II. ImpactThis vulnerability can disrupt the proper operation of the BIND server and may allow an attacker to execute privileged commands or code with the same permissions as the BIND server. Because BIND is typically run by a superuser account, the execution would occur with superuser privileges.
III. SolutionThe ISC has released BIND version 4.9.8 to address this security issue as well as others. The CERT/CC strongly recommends that all users of BIND 4.9.x upgrade to 4.9.8 immediately.
The BIND 4.9.8 distribution can be downloaded from:
The BIND 9.1 distribution can be downloaded from:
Please note that upgrading to BIND 4.9.8 also addresses the vulnerabilities discussed in VU#325431 and VU#868916.
Systems Affected
References
VU#196945, VU#325431, VU#868916
http://www.isc.org/products/BIND/bind-security.html
http://www.pgp.com/research/covert/advisories/047.asp
http://www.cymru.com/~robt/Docs/Articles/secure-bind-template.html
http://www.isi.edu/~bmanning/in-addr-audit.html
http://www.securityfocus.com/news/144
http://www.redhat.com/support/errata/RHSA-2001-007.html
Credit
The CERT/CC thanks the COVERT Labs at PGP Security for discovering and analyzing this vulnerability and the Internet Software Consortium for providing a patch to fix it.
This document was written by Jeffrey P. Lanza
Other Information
| Date Public | 01/29/2001 |
| Date First Published | 04/27/2001 05:24:01 PM |
| Date Last Updated | 05/01/2002 |
| CERT Advisory | CA-2001-02 |
| CVE Name | CAN-2001-0011 |
| Metric | 38.90 |
| Document Revision | 60 |
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