Bug 1468550 (CVE-2017-10985)

Summary: CVE-2017-10985 freeradius: Infinite loop and memory exhaustion with 'concat' attributes
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dpal, jdennis, lemenkov, nikolai.kondrashov, pkis, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: freeradius 3.0.15 Doc Type: If docs needed, set a value
Doc Text:
A denial of service flaw was found in the way FreeRADIUS server handled certain attributes in request packets. A remote attacker could use this flaw to cause the FreeRADIUS server to enter an infinite loop, consume increasing amounts of memory resources, and ultimately crash by sending a specially crafted request packet.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2017-08-02 09:41:17 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1469416, 1469417, 1471863    
Bug Blocks: 1468570    
Attachments:
Description Flags
Proposed patch none

Description Adam Mariš 2017-07-07 11:48:21 UTC 
When the server receives zero-length attributes marked 'concat' in the dictionaries, it could go into an infinite loop and exhaust memory. The issue happens when the server receives a packet containing the following attribute data: 4f 02, 89 02, 90 02, or b4 02.

The security impact is denial of service by anyone who can send packets which are accepted by the server.

Affected versions: 3.0.0 through 3.0.14, inclusive.
Comment 1 Adam Mariš 2017-07-07 11:48:26 UTC 
Acknowledgments:

Name: the FreeRADIUS project
Upstream: Guido Vranken
Comment 2 Adam Mariš 2017-07-07 12:06:16 UTC 
Created attachment 1295269 [details]
Proposed patch
Comment 5 Dhiru Kholia 2017-07-17 14:37:56 UTC 
Created freeradius tracking bugs for this issue:

Affects: fedora-all [bug 1471863]
Comment 6 errata-xmlrpc 2017-08-01 23:25:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2389 https://access.redhat.com/errata/RHSA-2017:2389
Comment 7 Dhiru Kholia 2017-08-02 09:42:05 UTC 
External References:

http://freeradius.org/security/fuzzer-2017.html