Bug 1468490 (CVE-2017-10979) - CVE-2017-10979 freeradius: Out-of-bounds write in rad_coalesce()
Summary: CVE-2017-10979 freeradius: Out-of-bounds write in rad_coalesce()
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-10979
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1469115 1469116 1471850
Blocks: 1468570
TreeView+ depends on / blocked
 
Reported: 2017-07-07 08:56 UTC by Adam Mariš
Modified: 2021-02-17 01:58 UTC (History)
6 users (show)

Fixed In Version: freeradius 2.2.10
Doc Type: If docs needed, set a value
Doc Text:
An out-of-bounds write flaw was found in the way FreeRADIUS server handled certain attributes in request packets. A remote attacker could use this flaw to crash the FreeRADIUS server or to execute arbitrary code in the context of the FreeRADIUS server process by sending a specially crafted request packet.
Clone Of:
Environment:
Last Closed: 2017-08-02 09:37:04 UTC


Attachments (Terms of Use)
Proposed patch (2.40 KB, patch)
2017-07-07 12:15 UTC, Adam Mariš
no flags Details | Diff


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1759 0 normal SHIPPED_LIVE Important: freeradius security update 2017-07-18 07:41:08 UTC

Description Adam Mariš 2017-07-07 08:56:37 UTC
The rad_coalesce() function checks for WiMAX attributes which are too small, but it does not check for WiMAX attributes which are too large. As a result, the server can be convinced to read past the end of an attribute, and to write past the end of memory allocated via malloc().

The data being copied is taken from the attributes following the malformed WiMAX attribute, and is under the control of the attacker. While the packet has to be a "well formed" RADIUS packet, that requirement limits only the two octets which immediately follow the malformed WiMAX attribute. After that, there are up to 245 octets copied which are the complete control of the attacker.

The issue happens when the server receives any packet containing malformed WiMAX attributes, potentially leading to remote code execution.

Affected versions: 2.0.0 through 2.2.9, inclusive.

Comment 1 Adam Mariš 2017-07-07 08:56:45 UTC
Acknowledgments:

Name: the FreeRADIUS project
Upstream: Guido Vranken

Comment 2 Adam Mariš 2017-07-07 12:15:33 UTC
Created attachment 1295281 [details]
Proposed patch

Comment 6 Dhiru Kholia 2017-07-17 14:31:14 UTC
Created freeradius tracking bugs for this issue:

Affects: fedora-all [bug 1471850]

Comment 7 errata-xmlrpc 2017-07-18 03:42:01 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 09:43:07 UTC
External References:

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


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