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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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Popularity:
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20,524 views
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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
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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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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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