Bug 856766 (CVE-2012-3955) - CVE-2012-3955 dhcp: reduced expiration time of an IPv6 lease may cause dhcpd to crash
Summary: CVE-2012-3955 dhcp: reduced expiration time of an IPv6 lease may cause dhcpd ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2012-3955
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 856770 858130
Blocks: 855229 856776
TreeView+ depends on / blocked
 
Reported: 2012-09-12 18:46 UTC by Vincent Danen
Modified: 2021-02-23 13:52 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2013-02-22 04:45:31 UTC
Embargoed:

Attachments (Terms of Use)
fix derived from upstream dhcp-4.2.4-P2 (7.34 KB, patch)
2012-09-12 18:53 UTC, Vincent Danen 		no flags Details | Diff
patch for dhcp-4.1.1-P1 in RHEL-6 (4.39 KB, patch)
2012-09-17 10:14 UTC, Jiri Popelka 		no flags Details | Diff
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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0504 0 normal SHIPPED_LIVE Low: dhcp security and bug fix update 2013-02-20 21:30:36 UTC

Description Vincent Danen 2012-09-12 18:46:07 UTC 
A flaw was reported in ISC DHCP [1] where it was found that reducing the expiration time for an active IPv6 lease could possible cause the dhcpd server to crash, resulting in a denial of service condition for clients.

ISC has recommended that when setting a value for the default-least-time option, that it be done in the configuration file and not reduced once set.

This has been corrected in upstream versions 4.1-ESV-R7 and 4.2.4-P2.

[1] https://kb.isc.org/article/AA-00779/75
Comment 1 Vincent Danen 2012-09-12 18:53:37 UTC 
Created attachment 612210 [details]
fix derived from upstream dhcp-4.2.4-P2
Comment 2 Vincent Danen 2012-09-12 18:54:34 UTC 
Created dhcp tracking bugs for this issue

Affects: fedora-all [bug 856770]
Comment 4 Jiri Popelka 2012-09-17 10:14:17 UTC 
Created attachment 613622 [details]
patch for dhcp-4.1.1-P1 in RHEL-6

extracted from diff of dhcp-4.1-ESV-R6 and dhcp-4.1-ESV-R7
Comment 7 Fedora Update System 2012-09-17 23:12:53 UTC 
dhcp-4.2.4-15.P2.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 19 Huzaifa S. Sidhpurwala 2012-09-25 08:35:24 UTC 
Upstream recommends that this issue can be mitigated by setting a value for the "default-lease-time" option in the configuration file and should not reduced once it is set.

Statement:

This issue does not affect the version of dhcp as shipped with Red Hat Enterprise Linux 5.
Comment 20 Fedora Update System 2012-09-26 08:52:52 UTC 
dhcp-4.2.4-13.P2.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 21 Fedora Update System 2012-10-03 03:20:44 UTC 
dhcp-4.2.4-1.P2.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 22 errata-xmlrpc 2013-02-21 08:23:50 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0504 https://rhn.redhat.com/errata/RHSA-2013-0504.html
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