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AUSCERT External Security Bulletin Redistribution
ESB-2010.0190.2
A Security Vulnerability in the ntp Daemon (xntpd(1M)) May Lead to a Denial
of the Solaris Network Time Protocol(NTP) Service
2 July 2010
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AusCERT Security Bulletin Summary
---------------------------------
Product: xntpd(1M)
Publisher: Sun Microsystems
Operating System: Solaris 8 Operating System
Solaris 9 Operating System
Solaris 10 Operating System
OpenSolaris
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2009-3563
Reference: ESB-2009.1613
Original Bulletin:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-275590-1
Revision History: July 2 2010: Patches have been released resolving
this issue
February 24 2010: Initial Release
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Article ID : 1021781.1
Article Type : Sun Alerts (SURE)
Last reviewed : 2010-06-30
Audience : PUBLIC
Copyright Notice: Copyright © 2010, Oracle Corporation and/or its
affiliates.
A Security Vulnerability in the ntp Daemon (xntpd(1M)) May Lead to a
Denial of the Solaris Network Time Protocol (NTP) Service
_________________________________________________________________
Category: Security
Release Phase: Resolved
Bug Id: SUNBUG: 6902029
Product: Solaris 8 Operating System
Solaris 9 Operating System
Solaris 10 Operating System
OpenSolaris
Date of Workaround Release: 13-Jan-2010
Date of Resolved Release: 30-Jun-2010
1. Impact
A security vulnerability in the ntp Daemon (xntpd(1M)) associated with
the handling of NTP mode 7 (MODE_PRIVATE), may lead to consumption of
CPU and excessive logging, resulting in a denial of the Solaris
Network Time Protocol (NTP) service.
This issue is also described in the following documents:
CVE-2009-3563 at:
[1]http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3563
US-CERT Vulnerability Note VU#568372 at
[2]http://www.kb.cert.org/vuls/id/568372
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 8 without patch [3]109667-08
* Solaris 9 without patch [4]117143-02
* Solaris 10 xntpd (SUNWntpu) without patch [5]127724-02
* Solaris 10 ntpd (SUNWntp4u) without patch [6]143725-01
* OpenSolaris based upon builds snv_01 through snv_132
x86 Platform
* Solaris 8 without patch [7]109668-08
* Solaris 9 without patch [8]117144-02
* Solaris 10 xntpd (SUNWntpu) without patch 127725-02
* Solaris 10 ntpd (SUNWntp4u) without patch [9]143726-01
* OpenSolaris based upon builds snv_01 through snv_132
Note: Only systems running as an NTP server are impacted by this
issue. To determine if a system is acting as an NTP server, execute
the following command:
$ netstat -an | grep 123
*.123 Idle
127.0.0.1.123 Idle
If the output of the command contains the above two lines, then the
system is running as an NTP server.
Note: OpenSolaris distributions may include additional bug fixes above
and beyond the build from which it was derived. The base build can be
derived as follows:
$ uname -v
snv_101
Note: Solaris 8 entered EOSL Phase 2 on 1 April 2009. Entitlement to
patches developed on or after 1 April 2009 requires the purchase of
the [10]Solaris 8 Vintage Patch Service. See Note in section 5 for
more details.
3. Symptoms
If this issue occurs, then the ntpd(1M) or xntpd(1M) process will use
an abnormal amount of system cycles. Also, an excessive number of MODE
7 NTP packets will be seen on the network.
4. Workaround
To avoid being vulnerable to this issue until patches can be
installed, add the following line to the '/etc/inet/ntp.conf' file if
you are using xntpd(1M):
restrict default noquery
And then restart the xntpd process. If you are using ntpd rather than
xntpd, please add the following two lines:
restrict default noquery
restrict :: noquery
And then restart the ntpd process.
For OpenSolaris and Solaris 10 prior to Update 8, do the following:
$ svcadm restart svc:/network/ntp:default
For Solaris 10 update 8 and later, do the following:
$ svcs -a | grep ntp
The above command will show one NTP service enabled. Use the FMRI from
the enabled service to restart. This will be either
svc:/network/ntp:default or svc:/network/ntp4:default
$ svcadm restart svc:/network/ntp:default
or
$ svcadm restart svc:/network/ntp4:default
For Solaris 9 and earlier, do the following:
$ cd /etc/init.d
$ sh xntpd stop
$ sh xntpd start
This workaround will prevent the NTP server from responding to any
mode 6 or mode 7 packets. These are the types of packets used by the
ntpq(1M), ntpq4(1M), ntptrace4(1M), xntpdc(1M) and ntpdc(1M) programs,
so these programs will no longer be able to contact the NTP server.
You can allow these programs to work from individual systems by adding
a restrict line to the ntp.conf file that allows that system again.
Using its IP address, add a line similar to this:
restrict <ip-addr-of-system>
Then restart the NTP service as described above.
Be aware that if the system you are allowing is itself an NTP server,
you will disable the workaround and again be vulnerable.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 8 with patch [11]109667-08 or later
* Solaris 9 with patch [12]117143-02 or later
* Solaris 10 xntpd (SUNWntpu) with patch [13]127724-02 or later
* Solaris 10 ntpd (SUNWntp4u) with patch [14]143725-01 or later
* OpenSolaris based upon builds snv_133 or later
x86 Platform
* Solaris 8 with patch [15]109668-08 or later
* Solaris 9 with patch [16]117144-02 or later
* Solaris 10 xntp (SUNWntpu) with patch [17]127725-02 or later
* Solaris 10 ntpd (SUNWntp4u) with patch [18]143726-01 or later
* OpenSolaris based upon builds snv_133 or later
Notes: The package SUNWntp4u was first shipped in Solaris 10 10/09.
The READMEs of Solaris 8 patches developed on or after 1 April 2009
are available to all customers. However, Solaris 8 entered EOSL Phase
2 on April 1, 2009, and thus entitlement for these patches, including
those that fix security vulnerabilities, requires the purchase of the
Solaris 8 Vintage Patch Service. More information about the Solaris 8
Vintage Patch Service is available at:
[19]http://www.sun.com/service/eosl/Solaris8.html
Modification History
08-Feb-2010: Updated Workaround section.
16-Feb-2010: Updated Contributing Factors and Resolution sections
10-Mar-2010: Updated Contributing Factors, Workaround and Resolution
sections.
17-Mar-2010: Updated Contributing Factors, Workaround and Resolution
sections.
12-Apr-2010: Updated Contributing Factors, Workaround and Resolution
sections.
30-Jun-2010: Updated Contributing Factors, Resolution sections for
patch release, now Resolved.
References
SUNPATCH [20]143725-01
SUNPATCH [21]143726-01
SUNPATCH [22]117143-02
SUNPATCH [23]117144-02
SUNPATCH [24]127724-02
SUNPATCH [25]127725-02
SUNPATCH [26]109667-08
SUNPATCH [27]109668-08
SUNBUG 6902029
[28]109667-08, [29]109668-08
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References
1. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3563
2. http://www.kb.cert.org/vuls/id/568372
3. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109667-08-1
4. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117143-02-1
5. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-127724-02-1
6. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-143725-01-1
7. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109668-08-1
8. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117144-02-1
9. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-143726-01-1
10. http://www.sun.com/service/eosl/Solaris8.html
11. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109667-08-1
12. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117143-02-1
13. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-127724-02-1
14. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-143725-01-1
15. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109668-08-1
16. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117144-02-1
17. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-127725-02-1
18. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-143726-01-1
19. http://www.sun.com/service/eosl/Solaris8.html
20. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-143725-01-1
21. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-143726-01-1
22. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117143-02-1
23. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-117144-02-1
24. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-127724-02-1
25. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-127725-02-1
26. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109667-08-1
27. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109668-08-1
28. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109667-08-1
29. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109668-08-1
30. http://www.oracle.com/us/corporate/index.htm
31. http://www.oracle.com/sun/index.html
32. http://www.oracle.com/rss/index.html
33. http://www.oracle.com/subscribe/index.html
34. http://www.oracle.com/corporate/employment/index.html
35. http://www.sun.com/contact/support.jsp
36. http://www.oracle.com/sitemaps/sitemaps.html
37. http://www.oracle.com/html/copyright.html
38. http://www.oracle.com/html/terms.html
39. file://localhost/sunsolveTermsOfUse.do
40. http://www.oracle.com/html/privacy.html
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