Description
Crypt::CBC Perl module 2.16 and earlier, when running in RandomIV mode, uses an initialization vector (IV) of 8 bytes, which results in weaker encryption when used with a cipher that requires a larger block size than 8 bytes, such as Rijndael.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libcrypt-cbc-perl | 2.17-1 | — |
| Debian 13 | libcrypt-cbc-perl | 2.17-1 | — |
| Debian 12 | libcrypt-cbc-perl | 2.17-1 | — |
| Debian 3.1 | libcrypt-cbc-perl | 2.12-1sarge1 | DSA-996-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Network Satellite 5 | jabberd | 2.0s10-3.38.rhn | RHSA-2008:0261 |
| Red Hat Network Satellite 5 | java-1.4.2-ibm +1 | 1.4.2.10-1jpp.2.el4 | RHSA-2008:0261 |
| Red Hat Network Satellite 5 | jfreechart | 0.9.20-3.rhn | RHSA-2008:0630, RHSA-2008:0261 |
| Red Hat Network Satellite 5 | mod_perl | 2.0.2-12.el4 | RHSA-2008:0630 |
| Red Hat Network Satellite 5 | openmotif21 | 2.1.30-11.RHEL4.6 | RHSA-2008:0261 |
| Red Hat Network Satellite 5 | perl-Crypt-CBC | 2.24-1.el4 | RHSA-2008:0630, RHSA-2008:0261 |
| Red Hat Network Satellite 5 | rhn-apache | 1.3.27-36.rhn.rhel4 | RHSA-2008:0261 |
| Red Hat Network Satellite 5 | rhn-html | 5.1.1-7 | RHSA-2008:0630 |
| Red Hat Network Satellite 5 | rhn-modjk-ap13 | 1.2.23-2rhn.rhel4 | RHSA-2008:0261 |
| Red Hat Network Satellite 5 | rhn-modperl | 1.29-16.rhel4 | RHSA-2008:0261 |
| Red Hat Network Satellite 5 | rhn-modssl | 2.8.12-8.rhn.10.rhel4 | RHSA-2008:0261 |
| Red Hat Network Satellite 5 | tomcat5 | 5.0.30-0jpp_10rh | RHSA-2008:0630, RHSA-2008:0261 |
| Red Hat Network Satellite 4 | jabberd | 2.0s10-3.37.rhn | RHSA-2008:0524 |
| Red Hat Network Satellite 4 | java-1.4.2-ibm +1 | 1.4.2.10-1jpp.2.el3 | RHSA-2008:0524 |
| Red Hat Network Satellite 4 | jfreechart | 0.9.20-3.rhn | RHSA-2008:0524 |
| Red Hat Network Satellite 4 | openmotif21 | 2.1.30-9.RHEL3.8 | RHSA-2008:0524 |
| Red Hat Network Satellite 4 | perl-Crypt-CBC | 2.24-1.el3 | RHSA-2008:0524 |
| Red Hat Network Satellite 4 | rhn-apache | 1.3.27-36.rhn.rhel3 | RHSA-2008:0524 |
| Red Hat Network Satellite 4 | rhn-modjk-ap13 | 1.2.23-2rhn.rhel3 | RHSA-2008:0524 |
| Red Hat Network Satellite 4 | rhn-modperl | 1.29-16.rhel3 | RHSA-2008:0524 |
| Red Hat Network Satellite 4 | rhn-modssl | 2.8.12-8.rhn.10.rhel3 | RHSA-2008:0524 |
| Red Hat Network Satellite 4 | tomcat5 | 5.0.30-0jpp_10rh | RHSA-2008:0524 |
Advisories 4
- RHSA-2008:0524 Red Hat Security Advisory: Red Hat Network Satellite Server security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2008:0261 Red Hat Security Advisory: Red Hat Network Satellite Server security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DSA-996-1 libcrypt-cbc-perl - programming error Debian Security (DSA / DLA) · Mar 9, 2026
- RHSA-2008:0630 Red Hat Security Advisory: Red Hat Network Satellite Server security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
References
- 20899 third-party-advisory
- RHSA-2008:0630 vendor-advisory
- 31493 third-party-advisory
- GLSA-200603-15 vendor-advisory
- 19187 third-party-advisory
- 488 third-party-advisory
- DSA-996 vendor-advisory
- 20060223 Vulnerability in Crypt::CBC Perl module, versions <= 2.16 mailing-list
- SUSE-SR:2006:015 vendor-advisory
- 19303 third-party-advisory
- 18755 third-party-advisory
- 16802 vdb-entry
- RHSA-2008:0261 vendor-advisory
- crypt-cbc-header-weak-encryption(24954) vdb-entry