De-referencing null pointer for certain signature expire values.
CVE:
[CVE-2002-1221](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1221)
CERT:
[VU#581682](http://www.kb.cert.org/vuls/id/581682)
Posting date:
12 Nov 2002
Program Impacted:
[BIND](https://www.isc.org/software/bind)
Versions affected:
8.3.0 - 8.3.3
Severity:
Serious
Exploitable:
Remotely
Description:
Remote attackers can cause a denial of service
(crash) via SIG RR elements with invalid expiry times, which are removed
from the internal BIND database and later cause a null dereference.
Workarounds:
Disable recursion, if possible.
Active exploits:
None known at this time.
Solution:
Upgrade to BIND 8.3.4 or later
**Acknowledgements:**
ISC would like to thank Internet Security Systems for bringing this to our attention.
© 2001-2018 Internet Systems Consortium
For assistance with problems and questions for which you have not been able to find an answer in our Knowledge Base, we recommend searching our community mailing list archives and/or posting your question there (you will need to register there first for your posts to be accepted). The bind-users and the dhcp-users lists particularly have a long-standing and active membership.
ISC relies on the financial support of the community to fund the development of its open source software products. If you would like to support future product evolution and maintenance as well having peace of mind knowing that our team of experts are poised to provide you with individual technical assistance whenever you call upon them, then please consider our Professional Subscription Support services - details can be found on our main website.