CVE-2017-8821
Publication date 3 December 2017
Last updated 24 July 2024
Ubuntu priority
Cvss 3 Severity Score
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, an attacker can cause a denial of service (application hang) via crafted PEM input that signifies a public key requiring a password, which triggers an attempt by the OpenSSL library to ask the user for the password, aka TROVE-2017-011.
From the Ubuntu Security Team
It was discovered that Tor incorrectly handled PEM input. An attacker could possibly use this to cause a denial of service.
Status
Package | Ubuntu Release | Status |
---|---|---|
tor | ||
18.04 LTS bionic |
Not affected
|
|
16.04 LTS xenial |
Fixed 0.2.9.14-1ubuntu1~16.04.2
|
|
14.04 LTS trusty |
Fixed 0.2.4.27-1ubuntu0.1
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.5 · High |
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 |