VDB-105857 · CVE-2017-13715 · BID 100517

Linux Kernel up to 4.2 flow_dissector.c __skb_flow_dissect n_proto/ip_proto/thoff input validation

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.
8.5	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 4.2 and classified as critical. This issue affects the function __skb_flow_dissect of the file net/core/flow_dissector.c. The manipulation of the argument n_proto/ip_proto/thoff as part of MPLS Packet leads to input validation. This vulnerability is uniquely identified as CVE-2017-13715. The attack is possible to be carried out remotely. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.2 (Operating System). It has been rated as critical. This issue affects the function __skb_flow_dissect of the file net/core/flow_dissector.c. The manipulation of the argument n_proto/ip_proto/thoff as part of a MPLS Packet leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

The __skb_flow_dissect function in net/core/flow_dissector.c in the Linux kernel before 4.3 does not ensure that n_proto, ip_proto, and thoff are initialized, which allows remote attackers to cause a denial of service (system crash) or possibly execute arbitrary code via a single crafted MPLS packet.

The bug was discovered 08/24/2017. The weakness was disclosed 08/29/2017 as confirmed git commit (GIT Repository). The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2017-13715 since 08/28/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $5k-$25k.

Upgrading to version 4.3 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be patching the affected component.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 100517†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.6
VulDB Meta Temp Score: 8.5

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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
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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.3
Patch: git.kernel.org

Timelineinfo

08/24/2017 🔍
08/28/2017 +4 days 🔍
08/28/2017 +0 days 🔍
08/28/2017 +0 days 🔍
08/29/2017 +1 days 🔍
08/29/2017 +0 days 🔍
12/27/2022 +1946 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: a6e544b0a88b53114bfa5a57e21b7be7a8dfc9d0
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-13715 (🔍)
GCVE (CVE): GCVE-0-2017-13715
GCVE (VulDB): GCVE-100-105857
SecurityFocus: 100517 - Linux Kernel CVE-2017-13715 Denial of Service Vulnerability

Entryinfo

Created: 08/29/2017 11:47
Updated: 12/27/2022 07:24
Changes: 08/29/2017 11:47 (61), 11/11/2019 09:07 (10), 12/27/2022 07:24 (4)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.