Joined: 12 May 2004
|Posted: Fri Mar 17, 2006 7:26 pm Post subject: [ GLSA 200603-15 ] Crypt::CBC: Insecure initialization vecto
|Gentoo Linux Security Advisory
Title: Crypt::CBC: Insecure initialization vector (GLSA 200603-15)
Date: March 17, 2006
Crypt::CBC uses an insecure initialization vector, potentially resulting in a weaker encryption.
Crypt::CBC is a Perl module to encrypt data using cipher block chaining (CBC).
Vulnerable: < 2.17
Unaffected: >= 2.17
Architectures: All supported architectures
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"
Last edited by GLSA on Sun May 07, 2006 5:00 pm; edited 1 time in total