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Insecure Library Loading
Moderately critical

OpenSSL Spoofing and Denial of Service Vulnerabilities

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Release Date:  2009-01-07    Last Update:  2009-06-05    Views:  11,208

Secunia Advisory SA33338

Where:

From remote

Impact:

Spoofing, DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


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

1) Certain OpenSSL functions fail to correctly verify the return value of the "EVP_VerifyFinal()" function when validating the signature of DSA and ECDSA keys. This can be exploited to bypass the signature check by e.g. sending a specially crafted signature of a certificate chain to a client.

Successful exploitation requires that the server uses a certificate containing a DSA or ECDSA key.

The vulnerability is reported in versions prior to 0.9.8j.

2) An error in the DTLS implementation can be exploited to crash a DTLS server via a "ChangeCipherSpec" record sent before "ClientHello".

The vulnerability is reported in versions prior to 0.9.8i.


Solution:
Update to version 0.9.8j.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) The vendor credits the Google Security Team.
2) Alex Lam

Original Advisory:
OpenSSL:
http://www.openssl.org/news/secadv_20090107.txt
http://rt.openssl.org/Ticket/Display.html?id=1679&user=guest&pass=guest

oCERT:
http://www.ocert.org/advisories/ocert-2008-016.html

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 Spoofing and Denial of Service Vulnerabilities

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