Bug 1468551 (CVE-2017-10986)

Summary: CVE-2017-10986 freeradius: Infinite read in dhcp_attr2vp()
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 09:41:18 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: 1469418, 1469419, 1471864    
Bug Blocks: 1468570    
Attachments:
Description Flags
Proposed patch none

Description Adam Mariš 2017-07-07 11:50:54 UTC 
When decoding "string" options in an array, dhcp_attr2vp() could be convinced to call memchr() with a length argument of -1. This could result in an over-read until the first zero octet was found, or a page fault occured.

The security impact is denial of service by any network device capable of sending DHCP packets to FreeRADIUS, which sends string options to the server in an option array.

Affected versions: 3.0.0 through 3.0.14, inclusive.
Comment 1 Adam Mariš 2017-07-07 11:51:00 UTC 
Acknowledgments:

Name: the FreeRADIUS project
Upstream: Guido Vranken
Comment 2 Adam Mariš 2017-07-07 12:04:35 UTC 
Created attachment 1295268 [details]
Proposed patch
Comment 5 Dhiru Kholia 2017-07-17 14:39:12 UTC 
Created freeradius tracking bugs for this issue:

Affects: fedora-all [bug 1471864]
Comment 6 errata-xmlrpc 2017-08-01 23:25:20 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 09:42:13 UTC 
External References:

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