Anyone can help me how can we get and apply security patch for this?
IMPORTANT: The security issue described below has been confirmed by ISC
to be 'in the wild' as of 18:00UTC July 26, and exploitation of this
vulnerability against production servers has been reported by multiple
organizations. Please be advised that immediate action is recommended.
A specially crafted query can cause BIND to terminate
Document Version: 2.0
Posting date: 26 July 2013
Program Impacted: BIND
Versions affected: Open source: 9.7.0->9.7.7, 9.8.0->9.8.5-P1,
9.9.0->9.9.3-P1, 9.8.6b1 and 9.9.4b1;
Subscription: 9.9.3-S1 and 9.9.4-S1b1
A specially crafted query that includes malformed rdata can cause
named to terminate with an assertion failure while rejecting the
BIND 9.6 and BIND 9.6-ESV are unaffected by this problem. Earlier
branches of BIND 9 are believed to be unaffected but have not
been tested. BIND 10 is also unaffected by this issue.
Please Note: All versions of BIND 9.7 are known to be affected,
but these branches are beyond their "end of life" (EOL) and no
longer receive testing or security fixes from ISC. For current
information on which versions are actively supported, please see
Internet Systems Consortium | BIND Software Status.
Authoritative and recursive servers are equally vulnerable.
Intentional exploitation of this condition can cause a denial
of service in all nameservers running affected versions of BIND
9. Access Control Lists do not provide any protection from
In addition to the named server, applications built using libraries
from the affected source distributions may crash with assertion
failures triggered in the same fashion.
CVSS Score: 7.8
CVSS Equation: (AV:N/AC:L/Au:N/C:N/I:N/A:C)
For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
National Vulnerability Database CVSS Scoring
No known workarounds at this time.
Crashes have been reported by multiple ISC customers. First
observed in the wild on 26 July 2013, 18:00 UTC.
Upgrade to the patched release most closely related to your
current version of BIND. Open source versions can all be
downloaded from Internet Systems Consortium | Downloads. Subscription
version customers will be contacted directly by ISC Support
BIND 9 version 9.8.5-P2
BIND 9 version 9.9.3-P2
BIND 9 version 9.9.3-S1-P1 (Subscription version available via DNSco)
ISC would like to thank Maxim Shudrak and the HP Zero Day
Initiative for reporting this issue.
Document Revision History:
1.0 Phase One Advance Notification, 18 July 2013
1.1 Phases Two and Three Advance Notification, 26 July 2013
2.0 Notification to public (Phase Four), 26 July 2013