Linux Kernel up to 4.14.4 Access Restriction nfnetlink_cthelper.c 7pk security

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.
6.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 4.14.4. Affected is an unknown function of the file net/netfilter/nfnetlink_cthelper.c of the component Access Restriction. Performing a manipulation results in 7pk security. This vulnerability is reported as CVE-2017-17448. The attack requires a local approach. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 4.14.4 (Operating System). This affects an unknown functionality of the file net/netfilter/nfnetlink_cthelper.c of the component Access Restriction. The manipulation with an unknown input leads to a 7pk security vulnerability. CWE is classifying the issue as CWE-254. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

net/netfilter/nfnetlink_cthelper.c in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN capability for new, get, and del operations, which allows local users to bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.

The bug was discovered 12/03/2017. The weakness was disclosed 12/07/2017 by ERNE (Website). It is possible to read the advisory at securityfocus.com. This vulnerability is uniquely identified as CVE-2017-17448 since 12/06/2017. Attacking locally is a requirement. The successful exploitation needs a authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1211 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 105383 (Fedora 26 : kernel (2017-ba6b6e71f7)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 236708 (Red Hat Update for kernel-alt (RHSA-2018:0654)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (105383) and SecurityFocus (BID 102117†). The entries VDB-104316, VDB-110308, VDB-110309 and VDB-110520 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: 7pk security
CWE: CWE-254
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 105383
Nessus Name: Fedora 26 : kernel (2017-ba6b6e71f7)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 831051
OpenVAS Name: Fedora Update for kernel FEDORA-2017-129969aa8a
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

12/03/2017 🔍
12/06/2017 +3 days 🔍
12/06/2017 +0 days 🔍
12/06/2017 +0 days 🔍
12/07/2017 +1 days 🔍
12/07/2017 +0 days 🔍
12/19/2017 +12 days 🔍
12/20/2017 +1 days 🔍
01/17/2023 +1854 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2017-ba6b6e71f7⛔
Researcher: Kevin Cernekee (ERNE)
Status: Confirmed

CVE: CVE-2017-17448 (🔍)
GCVE (CVE): GCVE-0-2017-17448
GCVE (VulDB): GCVE-100-110307

OVAL: 🔍

SecurityFocus: 102117 - Linux Kernel 'net/netfilter/nfnetlink_cthelper.c' Local Security Bypass Vulnerability

See also: 🔍

Entryinfo

Created: 12/07/2017 08:07
Updated: 01/17/2023 09:10
Changes: 12/07/2017 08:07 (78), 12/12/2019 16:01 (6), 01/26/2021 06:19 (2), 01/17/2023 09:05 (3), 01/17/2023 09:10 (1)
Complete: 🔍
Cache ID: 216:5FE:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!