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OpenSSL RSA Signature Forgery Vulnerability
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Secunia Advisory:
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SA21709
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Release Date:
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2006-09-05
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Last Update:
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2006-09-12
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Critical:
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Less critical
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Impact:
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Security Bypass
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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-2006-4339 (Secunia mirror)
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Description:
A vulnerability has been reported in OpenSSL, which potentially can be exploited by malicious people to bypass certain security restrictions.
The vulnerability is caused due to an error within the verification of certain signatures. If an RSA key with exponent 3 is used, it may be possible to forge a PKCS #1 v1.5 signature signed by that key.
The vulnerability is reported in versions 0.9.7j and 0.9.8b. Prior versions may also be affected.
Solution:
OpenSSL 0.9.7 branch:
Update to version 0.9.7k or later.
OpenSSL 0.9.8 branch:
Update to version 0.9.8c or later.
Provided and/or discovered by:
Daniel Bleichenbacher
Changelog:
2006-09-12: Added link to US-CERT.
Original Advisory:
http://www.openssl.org/news/secadv_20060905.txt
Other References:
US-CERT VU#845620:
http://www.kb.cert.org/vuls/id/845620
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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