Bug 1468495 (CVE-2017-10981)

Summary: CVE-2017-10981 freeradius: Memory leak in fr_dhcp_decode()
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: dkholia, dpal, jdennis, lemenkov, nikolai.kondrashov, pkis, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: freeradius 2.2.10 Doc Type: If docs needed, set a value
Doc Text:
A memory leak flaw was found in the way FreeRADIUS server handles decoding of DHCP packets. A remote attacker could use this flaw to cause the FreeRADIUS server to consume an increasing amount of memory resources over time, possibly leading to a crash due to memory exhaustion, by sending specially crafted DHCP packets.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2017-08-02 09:38:42 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: 1469122, 1469123, 1471853    
Bug Blocks: 1468570    
Attachments:
Description Flags
Proposed patch none

Description Adam Mariš 2017-07-07 09:07:02 UTC 
It was discovered that if option decoding fails, the fr_dhcp_decode() function would leak memory.

The security impact is denial of service via memory exhaustion by any network device capable of sending DHCP packets to FreeRADIUS, which sends packets with malformed options.

Affected versions: 2.0.0 through 2.2.9, inclusive.
Comment 1 Adam Mariš 2017-07-07 09:07:09 UTC 
Acknowledgments:

Name: the FreeRADIUS project
Upstream: Guido Vranken
Comment 2 Adam Mariš 2017-07-07 12:13:23 UTC 
Created attachment 1295278 [details]
Proposed patch
Comment 6 Dhiru Kholia 2017-07-17 14:33:45 UTC 
Created freeradius tracking bugs for this issue:

Affects: fedora-all [bug 1471853]
Comment 7 errata-xmlrpc 2017-07-18 03:42:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:1759 https://access.redhat.com/errata/RHSA-2017:1759
Comment 8 Dhiru Kholia 2017-08-02 09:47:04 UTC 
External References:

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