Bug 1468552 (CVE-2017-10987)

Summary: CVE-2017-10987 freeradius: Buffer over-read in fr_dhcp_decode_suboptions()
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:
An out-of-bounds read flaw was found in the way FreeRADIUS server handled decoding of DHCP packets. A remote attacker could use this flaw to crash the FreeRADIUS server by sending a specially crafted DHCP request.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2017-08-02 09:42:27 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: 1469421, 1469422, 1471865    
Bug Blocks: 1468570    
Attachments:
Description Flags
Proposed patch none

Description Adam Mariš 2017-07-07 11:52:58 UTC 
The fr_dhcp_decode_suboptions() function does not properly check if sub-options overflow the packet. The server can read up to a small number of octets more data than it should. Depending on memory layout, this read may initiate a page fault, and cause the server to crash.

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

Affected versions: 3.0.0 through 3.0.14, inclusive.
Comment 1 Adam Mariš 2017-07-07 11:53:05 UTC 
Acknowledgments:

Name: the FreeRADIUS project
Upstream: Guido Vranken
Comment 2 Adam Mariš 2017-07-07 12:03:43 UTC 
Created attachment 1295267 [details]
Proposed patch
Comment 5 Dhiru Kholia 2017-07-17 14:40:38 UTC 
Created freeradius tracking bugs for this issue:

Affects: fedora-all [bug 1471865]
Comment 6 errata-xmlrpc 2017-08-01 23:25:25 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 09:42:36 UTC 
External References:

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