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Bug 1370493 - (CVE-2016-7030) CVE-2016-7030 ipa: DoS attack against kerberized services by abusing password policy
CVE-2016-7030 ipa: DoS attack against kerberized services by abusing password...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20161214,repor...
: Security
Depends On: 1374638 1402810 1402811 1404690
Blocks: 1370497 1395316
  Show dependency tree / graph
 
Reported: 2016-08-26 09:22 EDT by Adam Mariš
Modified: 2017-01-02 06:48 EST (History)
8 users (show)

See Also:
Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
It was discovered that the default IdM password policies that lock out accounts after a certain number of failed login attempts were also applied to host and service accounts. A remote unauthenticated user could use this flaw to cause a denial of service attack against kerberized services.
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Clone Of:
Environment:
Last Closed: 2017-01-02 06:48:58 EST
Type: ---
Regression: ---
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Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Patch (7.66 KB, patch)
2016-12-12 05:42 EST, Cedric Buissart 		no flags Details | Diff
Show Obsolete (1) Add an attachment (proposed patch, testcase, etc.)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:0001 normal SHIPPED_LIVE Moderate: ipa security update 2017-01-02 10:54:30 EST

  None (edit)
Description Adam Mariš 2016-08-26 09:22:25 EDT 
A flaw was found that allows any unauthenticated party to easily run DoS attack against kerberized services in FreeIPA/IdM realm.

FreeIPA contains MIT KDC as its main component + FreeIPA is using custom database driver for the KDC. As a side-effect of implementation, FreeIPA is enforcing password policies for all principals, including services which do not use "password" but keytab with randomly-generated/strong key.

Default password policy locks an account after 5 unsuccessful authentication attempts for 10 minutes. An attacker can use this to simply lock-out any principal, including system services.

Upstream patch : 
https://git.fedorahosted.org/cgit/freeipa.git/commit/?id=6f1d927467e7907fd1991f88388d96c67c9bff61

Additional dependency :
https://git.fedorahosted.org/cgit/freeipa.git/commit/?id=73f33569c8893610e246b2f44a7aeaec872b37e6
Comment 1 Adam Mariš 2016-08-26 09:22:31 EDT 
Acknowledgments:

Name: Petr Spacek (Red Hat)
Comment 12 Cedric Buissart 2016-12-14 07:36:06 EST 
Created freeipa tracking bugs for this issue:

Affects: fedora-all [bug 1404690]
Comment 13 Cedric Buissart 2016-12-20 04:38:36 EST 
Comment on attachment 1230758 [details]
Patch

obsoleting patch : see description for list of upstream patches
Comment 14 errata-xmlrpc 2017-01-02 05:54:42 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:0001 https://rhn.redhat.com/errata/RHSA-2017-0001.html
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