Bug 437830 – <net-wireless/hostapd-1.0-r4 : EAP-TLS Message Handling Denial of Service Vulnerability (CVE-2012-4445)

• Status: RESOLVED FIXED
• Product: Gentoo Security

[Description Agostino Sarubbo 2012-10-10 12:27:07 UTC]

From secunia advisory at $URL:

Description
A vulnerability has been reported in hostapd, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a boundary error within the "eap_server_tls_process_fragment()" function (eap_server/eap_server_tls_common.c) when handling fragment data within TLS messages. This can be exploited to cause a buffer overflow and crash the service via a specially crafted EAP-TLS message.

Successful exploitation requires that hostapd is configured to use the internal EAP authentication server.

The vulnerability is reported in versions 0.6 through 1.0.


Solution
Fixed in the GIT repository.
http://w1.fi/gitweb/gitweb.cgi?p=hostap.git;a=commitdiff;h=586c446e0ff42ae00315b014924ec669023bd8de

[Comment 1 Bjarke Istrup Pedersen (RETIRED) 2012-10-10 13:14:42 UTC]

Patch included in hostapd-1.0-r4 - the rest is up to you :-)

[Comment 2 Agostino Sarubbo 2012-10-10 13:36:08 UTC]

(In reply to comment #1)
> Patch included in hostapd-1.0-r4 - the rest is up to you :-)

Thanks.

Arches, please test and mark stable:
=net-wireless/hostapd-1.0-r4
Target KEYWORDS: "amd64 ppc x86"

[Comment 3 Bjarke Istrup Pedersen (RETIRED) 2012-10-10 15:26:08 UTC]

Once marked stable, please remove every other version than 1.0-r4.

Thanks

[Comment 4 Andreas Schürch 2012-10-11 14:13:08 UTC]

x86 done

[Comment 5 Agostino Sarubbo 2012-10-11 14:23:58 UTC]

amd64 stable

[Comment 6 Anthony Basile 2012-10-12 00:53:14 UTC]

stable ppc

[Comment 7 Agostino Sarubbo 2012-10-12 06:47:19 UTC]

(In reply to comment #3)
> Once marked stable, please remove every other version than 1.0-r4.
> 
> Thanks

Cleanup done, security please vote.

[Comment 8 GLSAMaker/CVETool Bot 2012-10-13 20:39:26 UTC]

CVE-2012-4445 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-4445):
  Heap-based buffer overflow in the eap_server_tls_process_fragment function
  in eap_server_tls_common.c in the EAP authentication server in hostapd 0.6
  through 1.0 allows remote attackers to cause a denial of service (crash or
  abort) via a small "TLS Message Length" value in an EAP-TLS message with the
  "More Fragments" flag set.

[Comment 9 Stefan Behte (RETIRED) 2012-12-16 22:10:33 UTC]

Vote: no.

[Comment 10 Sean Amoss (RETIRED) 2012-12-16 22:25:38 UTC]

GLSA vote: no.

Closing noglsa.