TITLE:
Crypt::CBC RandomIV Header IV Handling Security Issue

SECUNIA ADVISORY ID:
SA18755

VERIFY ADVISORY:
http://secunia.com/advisories/18755/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
Crypt::CBC 2.x (PERL module)
http://secunia.com/product/8353/

DESCRIPTION:
Lincoln Stein has reported a security issue in Crypt::CBC, which can
be exploited by malicious people to bypass certain security
restrictions.

The security issue is caused due to an error within the handling of
16-byte IV (Initialisation Vector) when the RandomIV-style header is
used. This can cause the latter 8 bytes of each block to be CBC
encrypted with a constant IV of 0's when the Rijndael cipher (or
other ciphers with 16-byte block size) is used.

The security issue has been reported in version 2.16 and prior.

SOLUTION:
Update to version 2.17.
http://search.cpan.org/dist/Crypt-CBC/

PROVIDED AND/OR DISCOVERED BY:
Lincoln Stein

ORIGINAL ADVISORY:
http://search.cpan.org/src/LDS/Crypt-CBC-2.17/Changes

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