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OpenSSL Spoofing and Denial of Service Vulnerabilities
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Secunia Advisory:
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SA33338
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Release Date:
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2009-01-07
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Last Update:
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2009-06-05
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Popularity:
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5,351 views
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Critical:
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Moderately critical
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Impact:
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Spoofing
DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | OpenSSL 0.9.x
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Secunia CVSS-2 Score:
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| Advisory Content (Page 1 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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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.
Change Page:
[ 1 ] [ 2 ] [ 3 ]
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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