Vulnerability Name:

CVE-2015-1853 (CCN-172844)

Assigned:2015-04-07
Published:2015-04-07
Updated:2023-02-13
Summary: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.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
4.3 Medium (REDHAT CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-345
Vulnerability Consequences:Denial of Service
References:Source: secalert@redhat.com
Type: Release Notes, Vendor Advisory
secalert@redhat.com

Source: MITRE
Type: CNA
CVE-2015-1853

Source: XF
Type: UNKNOWN
chrony-cve20151853-dos(172844)

Source: CCN
Type: gentoo linux GLSA 201507-01
chrony: Multiple vulnerabilities

Source: secalert@redhat.com
Type: Third Party Advisory
secalert@redhat.com

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2015-1853

Vulnerable Configuration:Configuration RedHat 1:
  • cpe:/o:redhat:enterprise_linux:7:*:*:*:*:*:*:*
    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:7::client:*:*:*:*:*
    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:7::computenode:*:*:*:*:*
    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:7::server:*:*:*:*:*
    • Configuration RedHat 5:
  • cpe:/o:redhat:enterprise_linux:7::workstation:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.bionic:def:201518530000000
    V
    		CVE-2015-1853 on Ubuntu 18.04 LTS (bionic) - medium.
    2019-12-09
    oval:com.ubuntu.xenial:def:201518530000000
    V
    		CVE-2015-1853 on Ubuntu 16.04 LTS (xenial) - medium.
    2019-12-09
    oval:org.cisecurity:def:141
    P
    		DSA-3222-1 -- chrony -- security update
    2016-02-08
    oval:com.redhat.rhsa:def:20152241
    P
    		RHSA-2015:2241: chrony security, bug fix, and enhancement update (Moderate)
    2015-11-19
    oval:com.ubuntu.precise:def:20151853000
    V
    		CVE-2015-1853 on Ubuntu 12.04 LTS (precise) - medium.
    2015-04-07
    oval:com.ubuntu.cosmic:def:201518530000000
    V
    		CVE-2015-1853 on Ubuntu 18.10 (cosmic) - medium.
    2015-04-07
    oval:com.ubuntu.artful:def:20151853000
    V
    		CVE-2015-1853 on Ubuntu 17.10 (artful) - medium.
    2015-04-07
    oval:com.ubuntu.trusty:def:20151853000
    V
    		CVE-2015-1853 on Ubuntu 14.04 LTS (trusty) - medium.
    2015-04-07
    oval:com.ubuntu.bionic:def:20151853000
    V
    		CVE-2015-1853 on Ubuntu 18.04 LTS (bionic) - medium.
    2015-04-07
    oval:com.ubuntu.xenial:def:20151853000
    V
    		CVE-2015-1853 on Ubuntu 16.04 LTS (xenial) - medium.
    2015-04-07
    oval:com.ubuntu.cosmic:def:20151853000
    V
    		CVE-2015-1853 on Ubuntu 18.10 (cosmic) - medium.
    2015-04-07
    BACK