1. Gentoo Linux Security Advisory
| Advisory Reference | GLSA 200603-15 / crypt-cbc |
| Release Date | March 17, 2006 |
| Latest Revision | March 17, 2006: 01 |
| Impact | low |
| Exploitable | remote |
| Package | Vulnerable versions | Unaffected versions | Architecture(s) |
| dev-perl/crypt-cbc | < 2.17 | >= 2.17 | All supported architectures |
Related bugreports: #126048
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).
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:
Code Listing 3.1: Resolution |
# emerge --sync # emerge --ask --oneshot --verbose ">=dev-perl/crypt-cbc-2.17" |