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Debian DSA-3222-1 : chrony - security update

medium Nessus Plugin ID 82744

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Synopsis

The remote Debian host is missing a security-related update.

Description

Miroslav Lichvar of Red Hat discovered multiple vulnerabilities in chrony, an alternative NTP client and server :

 - CVE-2015-1821 Using particular address/subnet pairs when configuring access control would cause an invalid memory write. This could allow attackers to cause a denial of service (crash) or execute arbitrary code.

 - CVE-2015-1822 When allocating memory to save unacknowledged replies to authenticated command requests, a pointer would be left uninitialized, which could trigger an invalid memory write. This could allow attackers to cause a denial of service (crash) or execute arbitrary code.

 - CVE-2015-1853 When peering with other NTP hosts using authenticated symmetric association, the internal state variables would be updated before the MAC of the NTP messages was validated. This could allow a remote attacker to cause a denial of service by impeding synchronization between NTP peers.

Solution

Upgrade the chrony packages.

For the stable distribution (wheezy), these problems have been fixed in version 1.24-3.1+deb7u3.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=782160

https://security-tracker.debian.org/tracker/CVE-2015-1821

https://security-tracker.debian.org/tracker/CVE-2015-1822

https://security-tracker.debian.org/tracker/CVE-2015-1853

https://packages.debian.org/source/wheezy/chrony

https://www.debian.org/security/2015/dsa-3222

Plugin Details

Severity: Medium

ID: 82744

File Name: debian_DSA-3222.nasl

Version: 1.9

Type: local

Agent: unix

Published: 4/14/2015

Updated: 1/11/2021

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:chrony, cpe:/o:debian:debian_linux:7.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 4/12/2015

Vulnerability Publication Date: 4/16/2015

Reference Information

CVE: CVE-2015-1821, CVE-2015-1822, CVE-2015-1853

BID: 73948, 73955, 73956

DSA: 3222