what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New

FreeRADIUS 2.1.12 Remote Code Execution

FreeRADIUS 2.1.12 Remote Code Execution
Posted Sep 10, 2012
Authored by Timo Warns | Site pre-cert.de

PRE-CERT Security Advisory - A stack overflow vulnerability has been identified in FreeRADIUS that allows to remotely execute arbitrary code via specially crafted client certificates (before authentication). The vulnerability affects setups using TLS-based EAP methods (including EAP-TLS, EAP-TTLS, and PEAP).

tags | advisory, overflow, arbitrary
advisories | CVE-2012-3547
SHA-256 | b0d9e9f1f6322b919a73e21f48b721bb95437b973a72a0475504746bc07adab7

FreeRADIUS 2.1.12 Remote Code Execution

Change Mirror Download
PRE-CERT Security Advisory
==========================

* Advisory: PRE-SA-2012-06
* Released on: 10 September 2012
* Affected product: FreeRADIUS 2.1.10 - 2.1.12
* Impact: remote code execution
* Origin: specially crafted client certificates
* CVSS Base Score: 10
Impact Subscore: 10
Exploitability Subscore: 10
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)
* Credit: Timo Warns (PRESENSE Technologies GmbH)
* CVE Identifier: CVE-2012-3547


Summary
-------

A stack overflow vulnerability has been identified in FreeRADIUS that allows to
remotely execute arbitrary code via specially crafted client certificates
(before authentication). The vulnerability affects setups using TLS-based EAP
methods (including EAP-TLS, EAP-TTLS, and PEAP).

FreeRADIUS defines a callback function cbtls_verify() for certificate
verification. The function has a local buf array with a size of 64
bytes. It copies the validity timestamp "not after" of a client
certificate to the buf array:

asn_time = X509_get_notAfter(client_cert);
if ((lookup <= 1) && asn_time && (asn_time->length < MAX_STRING_LEN)) {
memcpy(buf, (char*) asn_time->data, asn_time->length);
buf[asn_time->length] = '\0';

The MAX_STRING_LEN constant is defined to be 254. If asn_time->length is
greater than 64 bytes, but less than 254 bytes, buf overflows via the memcpy.

Depending on the stack layout chosen by the compiler, the vulnerability allows
to overflow the return address on the stack, which can be exploited for code
execution.


Solution
--------

The issue has been fixed in FreeRADIUS 2.2.0. Updates should be installed as
soon as possible.


References
----------

When further information becomes available, this advisory will be
updated. The most recent version of this advisory is available at:

http://www.pre-cert.de/advisories/PRE-SA-2012-06.txt


Contact
--------

PRE-CERT can be reached under precert@pre-secure.de. For PGP key
information, refer to http://www.pre-cert.de/.
Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    32 Files
  • 20
    Mar 20th
    46 Files
  • 21
    Mar 21st
    16 Files
  • 22
    Mar 22nd
    13 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    12 Files
  • 26
    Mar 26th
    31 Files
  • 27
    Mar 27th
    19 Files
  • 28
    Mar 28th
    42 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close