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nCipher CHIL Random Cache Inheritance Security Issue
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Secunia Advisory:
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SA16323
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Release Date:
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2005-08-03
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Critical:
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Moderately critical
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Impact:
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Unknown
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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: | nCipher Cryptographic Hardware Interface Library (CHIL) 1.x
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Description:
A security issue has been reported in nCipher CHIL (Cryptographic Hardware Interface Library), which may result in a program generating the same random bytes in all child processes for a certain period of time.
The security issue is caused due to the "HWCryptoHook_RandomBytes()" function not clearing its cache of random bytes when a process calling the function forks. This causes each child process to use the same sequence of random bytes until they exhaust this cache.
Successful exploitation requires that the application forks child processes and is dependent on how CHIL is used in the application (e.g. child processes of a vulnerable application may generate the same session keys).
The security issue affects versions prior to 1.9.7.
Solution:
Update to version 1.9.7 or later and re-link affected applications to the fixed library.
Provided and/or discovered by:
Reported by vendor.
Original Advisory:
nCipher:
http://www.ncipher.com/support/advisories/keysigs/advisory11.txt.asc
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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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1 Related Secunia Security Advisories
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1. nCipher Products Multiple Vulnerabilities
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