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Insecure Library Loading
Moderately critical

OpenSSL Multiple Vulnerabilities

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Release Date:  2008-05-28    Last Update:  2011-12-01    Views:  12,880

Secunia Advisory SA30405

Where:

From remote

Impact:

Exposure of sensitive information, DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Some vulnerabilities have been reported in OpenSSL, which can be exploited by malicious people to disclose sensitive information or 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.

3) An error when performing certain computational operations for NIST elliptic curves P-256 or P-384 can be exploited to e.g. recover the private key of a TLS server.

Successful exploitation of this vulnerability requires that a 32bit version and that ECDHE family ciphers (without the SSL_OP_SINGLE_ECDH_USE ECDH option) or ECDH family ciphers are used.


Solution:
Update to version 0.9.8h.

Provided and/or discovered by:
1, 2) Ossi Herrala and Jukka Taimisto, Codenomicon Ltd.
3) B. B. Brumley, M. Barbosa, D. Page, and F. Vercauteren

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

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

B. B. Brumley, M. Barbosa, D. Page, and F. Vercauteren:
http://users.ics.tkk.fi/bbrumley/src/ecc_bug_attack.pdf

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: OpenSSL Multiple Vulnerabilities

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