Crypt::CBC: Insecure initialization vector

Crypt::CBC: Insecure initialization vector Crypt::CBC uses an insecure initialization vector, potentially resulting in a weaker encryption. crypt-cbc 2006-03-17 2006-03-17 126048 remote 2.17 2.17

Crypt::CBC is a Perl module to encrypt data using cipher block chaining (CBC).

Lincoln Stein discovered that Crypt::CBC fails to handle 16 bytes long initializiation vectors correctly when running in the RandomIV mode, resulting in a weaker encryption because the second part of every block will always be encrypted with zeros if the blocksize of the cipher is greater than 8 bytes.

An attacker could exploit weak ciphertext produced by Crypt::CBC to bypass certain security restrictions or to gain access to sensitive data.

There is no known workaround at this time.

All Crypt::CBC users should upgrade to the latest available version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-perl/crypt-cbc-2.17"

CVE-2006-0898 koon koon DerCorny