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Bug 1549960 - (CVE-2018-5732) CVE-2018-5732 dhcp: Buffer overflow in dhclient possibly allowing code execution triggered by malicious server
CVE-2018-5732 dhcp: Buffer overflow in dhclient possibly allowing code execut...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20180228,repo...
: Security
Depends On: 1549978 1549979 1549998 1550082 1550083 1550246 1550248
Blocks: 1549964
  Show dependency tree / graph
 
Reported: 2018-02-28 02:28 EST by Adam Mariš
Modified: 2018-03-19 06:17 EDT (History)
9 users (show)

See Also:
Fixed In Version: dhcp 4.1-ESV-R15-P1, dhcp 4.3.6-P1, dhcp 4.4.1
Doc Type: If docs needed, set a value
Doc Text:
An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to crash dhclient processes running on DHCP client machines via a crafted DHCP response packet.
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Clone Of:
Environment:
Last Closed: 2018-03-13 05:03:31 EDT
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:0469 normal SHIPPED_LIVE Important: dhcp security update 2018-03-09 10:09:18 EST
Red Hat Product Errata RHSA-2018:0483 normal SHIPPED_LIVE Important: dhcp security update 2018-03-12 19:03:59 EDT

  None (edit)
Description Adam Mariš 2018-02-28 02:28:02 EST 
Failure to properly bounds check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section.

Versions of DHCP affected: 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0
Comment 2 Adam Mariš 2018-02-28 02:45:00 EST 
Acknowledgments:

Name: ISC
Upstream: Felix Wilhelm (Google)
Comment 8 Tomas Hoger 2018-02-28 15:30:32 EST 
Public now via upstream advisory.

External References:

https://kb.isc.org/article/AA-01565
Comment 9 Tomas Hoger 2018-02-28 15:32:06 EST 
Created dhcp tracking bugs for this issue:

Affects: fedora-all [bug 1550246]
Comment 12 errata-xmlrpc 2018-03-09 05:06:01 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:0469 https://access.redhat.com/errata/RHSA-2018:0469
Comment 13 errata-xmlrpc 2018-03-12 14:46:28 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0483 https://access.redhat.com/errata/RHSA-2018:0483
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