Description
Tor before 0.1.1.20 uses OpenSSL pseudo-random bytes (RAND_pseudo_bytes) instead of cryptographically strong RAND_bytes, and seeds the entropy value at start-up with 160-bit chunks without reseeding, which makes it easier for attackers to conduct brute force guessing attacks.
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 | tor | 0.1.1.20-1 | — |
| Debian 13 | tor | 0.1.1.20-1 | — |
| Debian 12 | tor | 0.1.1.20-1 | — |
References
- 25880 vdb-entry
- 20514 third-party-advisory
- GLSA-200606-04 vendor-advisory
- http://tor.eff.org/cvs/tor/ChangeLog