Linux Kernel up to 4.11.3 skb Structure net/ipv6/ip6_output.c _ip6_append_data System Calls input validation

CVSS Meta Temp Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 4.11.3. This vulnerability affects the function _ip6_append_data of the file net/ipv6/ip6_output.c of the component skb Structure Handler. The manipulation as part of System Calls leads to input validation. This vulnerability is traded as CVE-2017-9242. An attack has to be approached locally. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 4.11.3 (Operating System). This issue affects the function _ip6_append_data of the file net/ipv6/ip6_output.c of the component skb Structure Handler. The manipulation as part of a System Calls 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 __ip6_append_data function in net/ipv6/ip6_output.c in the Linux kernel through 4.11.3 is too late in checking whether an overwrite of an skb data structure may occur, which allows local users to cause a denial of service (system crash) via crafted system calls.

The bug was discovered 06/21/2017. The weakness was shared 05/27/2017 by FiSh as confirmed git commit (GIT Repository). It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2017-9242 since 05/26/2017. Attacking locally is a requirement. A simple authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 100999 (Amazon Linux AMI : kernel (ALAS-2017-846)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176063 (Debian Security Update for Linux Kernel (DSA 3886-1) (Stack Clash)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100999) and SecurityFocus (BID 98731†). The entries VDB-101217, VDB-101218 and VDB-101233 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100999
Nessus Name: Amazon Linux AMI : kernel (ALAS-2017-846)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703886
OpenVAS Name: Debian Security Advisory DSA 3886-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍

Patch: git.kernel.org

Timelineinfo

05/26/2017 🔍
05/26/2017 +0 days 🔍
05/26/2017 +0 days 🔍
05/27/2017 +1 days 🔍
05/27/2017 +0 days 🔍
06/21/2017 +25 days 🔍
06/22/2017 +1 days 🔍
06/23/2017 +1 days 🔍
12/07/2022 +1993 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2017:1842
Researcher: idaifish (FiSh)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-9242 (🔍)
GCVE (CVE): GCVE-0-2017-9242
GCVE (VulDB): GCVE-100-101819

OVAL: 🔍

SecurityFocus: 98731 - Linux kernel CVE-2017-9242 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 05/27/2017 09:44
Updated: 12/07/2022 12:34
Changes: 05/27/2017 09:44 (83), 10/12/2019 21:00 (6), 12/25/2020 17:30 (3), 12/07/2022 12:34 (3)
Complete: 🔍
Cache ID: 216::103

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