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AUSCERT External Security Bulletin Redistribution
ESB-2015.3213
CVE-2015-8373 - ISC Kea: unexpected termination while
handling a malformed packet
23 December 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: ISC Kea
Publisher: ISC
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-8373
Original Bulletin:
https://kb.isc.org/article/AA-01318
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CVE-2015-8373 - ISC Kea: unexpected termination while handling a malformed
packet
Author: ISC
Support Reference Number: AA-01318
Views: 234
Created: 2015-11-30 17:17
Last Updated: 2015-12-22 22:16
0 Rating/ Voters
ISC Kea may terminate unexpectedly (crash) while handling a malformed
client packet.
CVE: CVE-2015-8373
Document Version: 2.0
Posting date: 22 December 2015
Program Impacted: ISC Kea
Versions affected: 0.9.2, 1.0.0-beta
Severity: Critical
Exploitable: Remotely
Description:
Related defects in the kea-dhcp4 and kea-dhcp6 servers can cause the server
to crash during option processing if a client sends a malformed packet.
The kea-dhcp4 server is vulnerable only in versions 0.9.2 and 1.0.0-beta,
and furthermore only when logging at debug level 40 or higher. Servers
running kea-dhcp4 versions 0.9.1 or lower, and servers which are not
logging or are logging at debug level 39 or below are not vulnerable.
The kea-dhcp6 server is vulnerable only in versions 0.9.2 and 1.0.0-beta,
and furthermore only when logging at debug level 45 or higher. Servers
running kea-dhcp6 versions 0.9.1 or lower, and servers which are not
logging or are logging at debug level 44 or below are not vulnerable.
Impact:
An attacker sending a crafted malformed packet can cause an ISC Kea server
providing DHCP services to IPv4 or IPv6 clients to exit unexpectedly.
CVSS Score: 7.1
CVSS Vector: (AV:N/AC:M/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:
http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2&vector=(AV:N/AC:M/Au:N/C:N/I:N/A:C)
Workarounds:
For DHCPv4 services, disabling debug logging or logging at debug levels
of 39 or lower will protect ISC Kea against this vulnerability.
For DHCPv6 services, disabling debug logging or logging at debug levels
of 44 or lower will protect ISC Kea against this vulnerability.
Active exploits:
No known active exploits exist; this vulnerability was found during
internal testing.
Solution: Upgrade to the patched release most closely related to
your current version of ISC Kea. These can all be downloaded from
http://www.isc.org/downloads.
ISC Kea version 0.9.2-P1
ISC Kea version 1.0.0-beta2
Document Revision History:
1.0 Advance Notification 15 December 2015
1.1 Revised 18 December 2015 (limiting vulnerable versions to 0.9.2 and
1.0.0-beta)
1.2 Revised 21 December 2015 (DHCPv4 workarounds determined and added)
2.0 Public Disclosure, 22 December 2015
Related Documents:
If you'd like more information on ISC Subscription Support and Advance
Security Notifications, please visit http://www.isc.org/support/.
Do you still have questions? Questions regarding this advisory should
go to security-officer@isc.org. To report a new issue, please encrypt
your message using security-officer@isc.org's PGP key which can be found
here: https://www.isc.org/downloads/software-support-policy/openpgp-key/.
If you are unable to use encrypted email, you may also report new issues
at: https://www.isc.org/community/report-bug/.
Note: ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on which versions
are actively supported, please see http://www.isc.org/downloads/).
ISC Security Vulnerability Disclosure Policy: Details of our
current security advisory policy and practice can be found here:
https://kb.isc.org/article/AA-00861/164/ISC-Software-Defect-and-Security-Vulnerability-Disclosure-Policy.html
This Knowledge Base article https://kb.isc.org/article/AA-01318 is the
complete and official security advisory document.
Legal Disclaimer:
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basis. No warranty or guarantee of any kind is expressed in this notice and
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without limitation, any implied warranty of merchantability, fitness for a
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