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OpenSSL Two Denial of Service Vulnerabilities
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Secunia Advisory:
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SA30405
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Release Date:
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2008-05-28
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Last Update:
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2008-06-02
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Popularity:
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6,469 views
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Critical:
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Moderately critical
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Impact:
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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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| CVE reference: | CVE-2008-0891
CVE-2008-1672
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Description:
Two vulnerabilities have been reported in OpenSSL, which can be exploited by malicious people to 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.
The vulnerabilities are reported in versions 0.9.8f and 0.9.8g.
Solution:
Update to version 0.9.8h.
Provided and/or discovered by:
Ossi Herrala and Jukka Taimisto, Codenomicon Ltd.
Changelog:
2008-05-29: Updated "Description" and "Provided and/or discovered by" sections with additional information from CERT-FI. Added link to "Original Advisory" section.
2008-06-02: Added link to US-CERT.
Original Advisory:
OpenSSL:
http://www.openssl.org/news/secadv_20080528.txt
CERT-FI:
http://cert.fi/haavoittuvuudet/2008/advisory-openssl.html
Other References:
US-CERT VU#520586:
http://www.kb.cert.org/vuls/id/520586
US-CERT VU#661475:
http://www.kb.cert.org/vuls/id/661475
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About this Secunia Advisory
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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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