ntpd up to 4.2.8p7 Autokey race condition

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in ntpd up to 4.2.8p7. Impacted is an unknown function of the component Autokey Handler. Such manipulation leads to race condition. This vulnerability is uniquely identified as CVE-2016-4955. The attack can be launched remotely. No exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in ntpd up to 4.2.8p7 (Network Management Software). Affected by this issue is an unknown function of the component Autokey Handler. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is availability.

The weakness was disclosed 06/02/2016 by Miroslav Lichvar with Red Hat as confirmed release notes (Website). The advisory is shared for download at support.ntp.org. The public release has been coordinated in cooperation with the vendor. This vulnerability is handled as CVE-2016-4955 since 05/23/2016. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 91662 (SUSE SLED12 / SLES12 Security Update : ntp (SUSE-SU-2016:1563-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371401 (Cisco UCS 6200 Series Fabric Interconnects Multiple Vulnerabilities in Network Time Protocol Daemon (CSCuz92668)).

Applying the patch 4.2.8p8 is able to eliminate this problem. A possible mitigation has been published before and not just after the disclosure of the vulnerability. The release notes contains the following remark:

NTP Consortium members at the Partner and Premier levels received pre-release patch access.

The vulnerability is also documented in the databases at Tenable (91662), SecurityFocus (BID 91007†) and SecurityTracker (ID 1036037†). kb.cert.org is providing further details. The entries VDB-87750, VDB-87751, VDB-87753 and VDB-87754 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

VulDB Base Score: 8.6
VulDB Temp Score: 8.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.0
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 91662
Nessus Name: SUSE SLED12 / SLES12 Security Update : ntp (SUSE-SU-2016:1563-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 862576
OpenVAS Name: SuSE Update for ntp SUSE-SU-2016:1568-1 (ntp)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 4.2.8p8

Timelineinfo

05/23/2016 🔍
05/24/2016 +1 days 🔍
05/24/2016 +0 days 🔍
06/02/2016 +9 days 🔍
06/02/2016 +0 days 🔍
06/06/2016 +4 days 🔍
06/06/2016 +0 days 🔍
06/17/2016 +11 days 🔍
07/04/2016 +17 days 🔍
01/27/2025 +3129 days 🔍

Sourcesinfo

Advisory: USN-3096-1
Researcher: Miroslav Lichvar
Organization: Red Hat
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2016-4955 (🔍)
GCVE (CVE): GCVE-0-2016-4955
GCVE (VulDB): GCVE-100-87752

OVAL: 🔍

CERT: 🔍
SecurityFocus: 91007 - NTP CVE-2016-4955 Denial of Service Vulnerability
SecurityTracker: 1036037

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 06/06/2016 16:09
Updated: 01/27/2025 02:04
Changes: 06/06/2016 16:09 (76), 01/06/2019 10:27 (14), 08/23/2022 08:05 (5), 01/27/2025 02:04 (15)
Complete: 🔍
Cache ID: 216::103

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