CVE-2017-8819
Published: 3 December 2017
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.
From the Ubuntu Security Team
It was discovered that the replay-cache protection mechanism used by Tor is ineffective for v2 onion services. An attacker could possible use this to facilitate a traffic confirmation attack.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
tor Launchpad, Ubuntu, Debian |
artful |
Released
(0.3.0.13-0ubuntu1~17.10.2)
|
| bionic |
Not vulnerable
(0.3.1.9-1)
|
|
| cosmic |
Not vulnerable
(0.3.1.9-1)
|
|
| trusty |
Released
(0.2.4.27-1ubuntu0.1)
|
|
| upstream |
Released
(0.2.9.14-1, 0.3.1.9-1)
|
|
| xenial |
Released
(0.2.9.14-1ubuntu1~16.04.2)
|
|
| zesty |
Ignored
(end of life)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |