CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0	$0-$5k	0.00

Summaryinfo

A vulnerability was found in chrony up to 1.31.0. It has been classified as critical. This affects an unknown part. This manipulation causes memory corruption. The identification of this vulnerability is CVE-2015-1821. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in chrony up to 1.31.0. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Heap-based buffer overflow in chrony before 1.31.1 allows remote authenticated users to cause a denial of service (chronyd crash) or possibly execute arbitrary code by configuring the (1) NTP or (2) cmdmon access with a subnet size that is indivisible by four and an address with a nonzero bit in the subnet remainder.

The weakness was shared 04/16/2015 by Miroslav Lichvar (Website). The advisory is shared at listengine.tuxfamily.org. This vulnerability is known as CVE-2015-1821 since 02/17/2015. The attack can be launched remotely. The requirement for exploitation is a single authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 82716 (Debian DLA-193-1 : chrony security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350163 (Amazon Linux Security Advisory for chrony: ALAS-2015-539).

Upgrading to version 1.31.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (82716), SecurityFocus (BID 73948†) and Vulnerability Center (SBV-49961†). The entries VDB-68347, VDB-72083, VDB-74129 and VDB-74990 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• chrony

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31.0

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 82716
Nessus Name: Debian DLA-193-1 : chrony security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 103435
OpenVAS Name: RedHat Update for chrony RHSA-2015:2241-03
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: chrony 1.31.1

Timelineinfo

02/17/2015 🔍
04/07/2015 +49 days 🔍
04/12/2015 +5 days 🔍
04/13/2015 +1 days 🔍
04/16/2015 +3 days 🔍
04/16/2015 +0 days 🔍
04/17/2015 +1 days 🔍
05/04/2015 +17 days 🔍
05/09/2022 +2562 days 🔍

Sourcesinfo

Advisory: listengine.tuxfamily.org
Researcher: Miroslav Lichvar
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-1821 (🔍)
GCVE (CVE): GCVE-0-2015-1821
GCVE (VulDB): GCVE-100-74989

OVAL: 🔍

SecurityFocus: 73948 - Chrony CVE-2015-1853 Remote Denial of Service Vulnerability
Vulnerability Center: 49961 - Chrony before 1.31.1 Remote DoS or Code Execution due to a Heap-Based Buffer Overflow, Medium

See also: 🔍

Entryinfo

Created: 04/17/2015 10:25
Updated: 05/09/2022 08:38
Changes: 04/17/2015 10:25 (62), 06/28/2017 06:18 (10), 05/09/2022 08:38 (3)
Complete: 🔍
Cache ID: 216:892:103

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