Vulnerability Note VU#198355

ISC BIND 8.2.2-P6 vulnerable to DoS when processing SRV records, aka the "srv bug"

Original Release date: 11 May 2001 | Last revised: 25 Jan 2002


There is a denial-of-service vulnerability in several versions of the Internet Software Consortium's (ISC) BIND software. This vulnerability is referred to by the ISC as the "srv bug" and affects ISC BIND versions 8.2 through 8.2.2-P6.


This vulnerability can cause affected DNS servers running named to go into an infinite loop, thus preventing further name requests to be handled. This can happen if an SRV record (defined in RFC2782) is sent to the vulnerable server.

Microsoft's Windows 2000 Active Directory service makes extensive use of SRV records and is reportedly capable of triggering this bug in the course of normal operations. This is not, however, a vulnerability in Microsoft Active Directory. Any network client capable of sending SRV records to vulnerable name server systems can exercise this vulnerability.


A remote attacker can use malicious SRV records to crash vulnerable BIND servers, resulting in a denial-of-service condition that disables name resolution service.


Apply a patch from your vendor

To address this vulnerability, the CERT/CC recommends that all users of ISC BIND upgrade to version 8.2.2-P7, which patches both VU#198355 and VU#715973. For information regarding vendor-specific versions of DNS software, please consult the Systems Affected section of this document.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Compaq Computer CorporationAffected12 Nov 200016 May 2001
DebianAffected-16 May 2001
Hewlett PackardAffected12 Nov 200025 Jan 2002
IBMAffected12 Nov 200011 May 2001
ISCAffected-11 May 2001
SuSEAffected16 Nov 200011 May 2001
TrustixAffected16 Nov 200011 May 2001
FreeBSDNot Affected12 Nov 200011 May 2001
FujitsuNot Affected12 Nov 200011 May 2001
CalderaUnknown12 Nov 200016 May 2001
ConectivaUnknown-11 May 2001
ImmunixUnknown-11 May 2001
MandrakeSoftUnknown-11 May 2001
MicrosoftUnknown-11 May 2001
NetBSDUnknown-11 May 2001
If you are a vendor and your product is affected, let us know.View More »

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



The CERT Coordination Center thanks Mark Andrews, David Conrad, and Paul Vixie of the ISC for developing a solution and assisting in the preparation of this document.

This document was written by Jeffrey S. Havrilla and Jeffrey P. Lanza.

Other Information

  • CVE IDs: CVE-2000-0888
  • CERT Advisory: CA-2000-20
  • Date Public: 07 Nov 2000
  • Date First Published: 11 May 2001
  • Date Last Updated: 25 Jan 2002
  • Severity Metric: 16.71
  • Document Revision: 10


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