ntpd 4.2.8 Password Management Key File use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

A vulnerability classified as critical was found in ntpd 4.2.8 (Network Management Software). This vulnerability affects some unknown functionality of the component Password Management. The manipulation as part of a Key File leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Use-after-free vulnerability in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to possibly execute arbitrary code or cause a denial of service (crash) via crafted packets.

The weakness was published 10/21/2015 as cisco-sa-20151021-ntp as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability was named CVE-2015-7849 since 10/16/2015. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 86519 (FreeBSD : ntp -- 13 low- and medium-severity vulnerabilities (c4a18a12-77fc-11e5-a687-206a8a720317)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38684 (Network Time Protocol Multiple Security Vulnerabilities (ntp-4.2.8p4)).

Upgrading to version 4.2.8p4 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (107442) and Tenable (86519). Additional details are provided at talosintel.com.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
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Nessus ID: 86519
Nessus Name: FreeBSD : ntp -- 13 low- and medium-severity vulnerabilities (c4a18a12-77fc-11e5-a687-206a8a720317)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 103403
OpenVAS Name: Multiple Vulnerabilities in ntpd Affecting Cisco Products - October 2015
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: ntpd 4.2.8p4

Timelineinfo

10/16/2015 🔍
10/21/2015 +5 days 🔍
10/21/2015 +0 days 🔍
10/21/2015 +0 days 🔍
10/23/2015 +2 days 🔍
10/23/2015 +0 days 🔍
08/07/2017 +654 days 🔍
06/24/2022 +1782 days 🔍

Sourcesinfo

Advisory: cisco-sa-20151021-ntp
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7849 (🔍)
X-Force: 107442 - Network Time Protocol password management functionality buffer overflow
SecurityTracker: 1033951
Vulnerability Center: 53944 - NTP before 4.2.8p4 Remote Unspecified Vulnerability due to Use-After-Free in Trusted Key - CVE-2015-7849, High
SecurityFocus: 77276

Misc.: 🔍

Entryinfo

Created: 10/23/2015 10:04
Updated: 06/24/2022 23:35
Changes: 10/23/2015 10:04 (85), 02/20/2018 10:24 (1), 06/24/2022 23:24 (4), 06/24/2022 23:35 (1)
Complete: 🔍
Cache ID: 3:19A:103

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