Technical Description

Two vulnerabilities have been identified in OpenSSL, which could be exploited by attackers to cause a denial of service.

The first issue is caused by a double-free error within the handling of server name extension data when the application has been compiled using the non-default TLS server name extensions, which could be exploited by remote attackers to crash an affected application via a specially crafted Client Hello packet.

The second vulnerability is caused by a NULL pointer dereference error when the Server Key exchange message is omitted from a TLS handshake, which could be exploited to crash a vulnerable client when connected to a malicious server with particular cipher suites.

Affected Products

OpenSSL version 0.9.8f
OpenSSL version 0.9.8g

Solution

Upgrade to OpenSSL version 0.9.8h :
http://www.openssl.org/source/

References

http://www.vupen.com/english/advisories/2008/1680
http://www.openssl.org/news/secadv_20080528.txt
http://cert.fi/haavoittuvuudet/2008/advisory-openssl.html

Credits

Vulnerabilities reported by Ossi Herrala and Jukka Taimisto (CROSS project / Codenomicon).

ChangeLog

2008-05-28 : Initial release

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