Solaris root password is working with extra char/chars appended with it

Dear forum,
In our production server, I can login as root with extra char appended end of the actual password
Exmaple:
Suppose my password is `hello123`
But during login all below combinations are working and allowing to login
hello123*456*
hello123*4*
hello123*hello*
That is, login is not checking further chars after the exact macth with the actuall pass.
1) But why?
2) How to prevent this.... any file need to change /etc/default
NB:
Dear Nik if you are reading this post... please reply
Edited by: Myth on Jan 29, 2012 10:28 PM

It might be worth to note that you will get the crypto algorithm which is defined in /etc/security/crypto.conf
The default of the crypto.conf is:
1 crypt_bsdmd5.so.1
2a crypt_bsdbf.so.1
md5 crypt_sunmd5.so.1
5 crypt_sha256.so.1
6 crypt_sha512.so.1.. if you set CRYPT_DEFAULT in policy.conf to "md5", you will use the crypto algorithm crypto_sunmd5.so.1, if you set CRYPT_DEFAULT to "1" you will get crypt_bsdmd5.so.1.
Its also worth to notice that the default in Solaris 11 is
CRYPT_DEFAULT=5
i.e "crypt_sha256.so.1".
.7/M.

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Solstice DiskSuite[TM] Software: How to Delete and Reset a Lost Root Password on a System With a Mirrored Root Disk [ID 1010755.1]
Solution
Steps to Follow
How to delete and reset a lost root password on a system with a mirrored root disk.
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