Description
In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, the replay-cache protection mechanism is ineffective for v2 onion services, aka TROVE-2017-009. An attacker can send many INTRODUCE2 cells to trigger this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9 | Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9 | — |
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 | 0.3.1.9-1 | — |
| Debian 13 | tor | 0.3.1.9-1 | — |
| Debian 12 | tor | 0.3.1.9-1 | — |
| Debian 9 | tor | 0.2.9.14-1 | DSA-4054-1 |
| Debian 8 | tor | 0.2.5.16-1 | DSA-4054-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | tor | 0.2.9.14-1ubuntu1~16.04.2 | — |
| Ubuntu 14.04 LTS | tor | 0.2.4.27-1ubuntu0.1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | tor | 0.3.1.9-8.1 | openSUSE-SU-2017:3203-1, openSUSE-SU-2017:3201-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tor | 0.4.6.7-2.2 | openSUSE-SU-2024:11469-1 |
Advisories 4
- DSA-4054-1 tor - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2017:3203-1 Security update for tor SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11469-1 tor-0.4.6.7-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2017:3201-1 Security update for tor SUSE / openSUSE Security Updates · Feb 4, 2026