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Netsikker nu! 2008
 
OpenSSL Two Denial of Service Vulnerabilities
Secunia Advisory: SA30405
Release Date: 2008-05-28
Last Update: 2008-06-02
Popularity: 6,469 views

Critical:
Moderately critical
Impact: DoS
Where: From remote
Solution Status: Vendor Patch

Software:OpenSSL 0.9.x

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CVE reference:CVE-2008-0891
CVE-2008-1672


Description:
Two vulnerabilities have been reported in OpenSSL, which can be exploited by malicious people to cause a DoS (Denial of Service).

1) A double-free error in the handling of server name extension data if "server_name" set to 0x00 can be exploited to crash a server application using OpenSSL by sending a specially crafted TLS 1.0 Client Hello packet.

Successful exploitation requires that OpenSSL is compiled using the TLS server name extensions.

2) A NULL pointer dereference error can be exploited by a malicious server to crash a client application when the "Server Key exchange message" is omitted from a TLS handshake and anonymous Diffie-Hellman key exchange is used.

The vulnerabilities are reported in versions 0.9.8f and 0.9.8g.

Solution:
Update to version 0.9.8h.

Provided and/or discovered by:
Ossi Herrala and Jukka Taimisto, Codenomicon Ltd.

Changelog:
2008-05-29: Updated "Description" and "Provided and/or discovered by" sections with additional information from CERT-FI. Added link to "Original Advisory" section.
2008-06-02: Added link to US-CERT.

Original Advisory:
OpenSSL:
http://www.openssl.org/news/secadv_20080528.txt

CERT-FI:
http://cert.fi/haavoittuvuudet/2008/advisory-openssl.html

Other References:
US-CERT VU#520586:
http://www.kb.cert.org/vuls/id/520586

US-CERT VU#661475:
http://www.kb.cert.org/vuls/id/661475


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