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CVE-2016-8860

Published: 4 January 2017

Tor before 0.2.8.9 and 0.2.9.x before 0.2.9.4-alpha had internal functions that were entitled to expect that buf_t data had NUL termination, but the implementation of or/buffers.c did not ensure that NUL termination was present, which allows remote attackers to cause a denial of service (client, hidden service, relay, or authority crash) via crafted data.

From the Ubuntu Security Team

It was discovered that Tor improperly NUL terminated data. An attacker could possibly use this to cause a crash and denial of service.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
tor
Launchpad, Ubuntu, Debian
cosmic Not vulnerable
(0.2.8.9-1ubuntu1)
precise Ignored
(end of life)
trusty
Released (0.2.4.27-1ubuntu0.1)
upstream
Released (0.2.8.9-1)
xenial Not vulnerable
(0.2.8.9-1ubuntu1)
yakkety Ignored
(end of life)
zesty Not vulnerable
(0.2.8.9-1ubuntu1)
artful Not vulnerable
(0.2.8.9-1ubuntu1)
bionic Not vulnerable
(0.2.8.9-1ubuntu1)

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