Description
The blowfish mode in DAR before 2.3.4 uses weak Blowfish-CBC cryptography by (1) discarding random bits by the blowfish::make_ivec function in libdar/crypto.cpp that results in predictable and repeating IV values, and (2) direct use of a password for keying, which makes it easier for context-dependent attackers to decrypt files.
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 | dar | 2.3.3-1 | — |
| Debian 13 | dar | 2.3.3-1 | — |
| Debian 12 | dar | 2.3.3-1 | — |
References
- https://sourceforge.net/forum/forum.php?forum_id=711619
- 24930 vdb-entry
- https://sourceforge.net/tracker/index.php?func=detail&aid=1730439&group_id=65612&atid=511612
- 25953 third-party-advisory
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=425335
- 38189 vdb-entry
- https://sourceforge.net/forum/forum.php?forum_id=711620
- 38190 vdb-entry