Crypt::CBC uses an insecure initialization vector, potentially resulting in a weaker encryption.
|Package||dev-perl/crypt-cbc on all architectures|
|Affected versions||< 2.17|
|Unaffected versions||>= 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"
March 17, 2006
March 17, 2006: 01