Technical Description

Multiple vulnerabilities have been identified in OpenSSL, which could be exploited by attackers to cause a denial of service or potentially execute arbitrary commands.

The first issue is due to an infinite loop when handling invalid ASN.1 structures, which could be exploited by attackers to exhaust all available resources, creating a denial of service condition.

The second flaw is due to an error when processing certain types of public keys, which could be exploited by attackers to cause a denial of service.

The third vulnerability is due to a buffer overflow in the "SSL_get_shared_ciphers()" function when handling a specially crafted list of ciphers, which could be exploited by attackers to cause a denial of service and potentially compromise a vulnerable system via applications that use the affected function (e.g. Exim or MySQL).

The fourth issue is due to an error in the SSLv2 client code when creating SSLv2 connections to a malicious server, which could be exploited by attackers to cause a denial of service.

Affected Products

OpenSSL versions prior to 0.9.7l
OpenSSL versions prior to 0.9.8d

Solution

Upgrade to OpenSSL version 0.9.7l or 0.9.8d :
http://www.openssl.org/source/

References

http://www.vupen.com/english/advisories/2006/3820
http://www.openssl.org/news/secadv_20060928.txt

Credits

Vulnerabilities reported by Dr. S. N. Henson (Open Network Security), Tavis Ormandy and Will Drewry (Google Security Team).

ChangeLog

2006-09-28 : Initial release

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