CVE-2015-1853
Published: 9 December 2019
chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP associations, which allows remote attackers with knowledge of NTP peering to cause a denial of service (inability to synchronize) via random timestamps in crafted NTP data packets.
From the Ubuntu Security Team
Miroslav Lichvár discovered a head-based buffer overflow in chrony. A remote attacker could use this vulnerability to cause a denial of service (crash) or execute arbitrary code.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
chrony Launchpad, Ubuntu, Debian |
artful |
Not vulnerable
(3.1-5)
|
| bionic |
Not vulnerable
(3.2-4ubuntu1)
|
|
| cosmic |
Not vulnerable
(3.2-4ubuntu1)
|
|
| lucid |
Ignored
(reached end-of-life)
|
|
| precise |
Does not exist
(precise was needed)
|
|
| trusty |
Released
(1.29-1ubuntu0.1)
|
|
| upstream |
Released
(1.31.1)
|
|
| utopic |
Ignored
(reached end-of-life)
|
|
| vivid |
Ignored
(reached end-of-life)
|
|
| wily |
Ignored
(reached end-of-life)
|
|
| xenial |
Not vulnerable
(2.1.1-1)
|
|
| yakkety |
Ignored
(reached end-of-life)
|
|
| zesty |
Ignored
(reached end-of-life)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |