Linux Kernel up to 4.8 Netfilter Subsystem nf_conntrack_reasm.c IPv6 Fragments out-of-bounds write

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6.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 4.8. Affected is an unknown function of the file net/ipv6/netfilter/nf_conntrack_reasm.c of the component Netfilter Subsystem. The manipulation as part of IPv6 Fragments results in out-of-bounds write. This vulnerability was named CVE-2016-9755. The attack needs to be approached locally. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 4.8 (Operating System). Affected is some unknown functionality of the file net/ipv6/netfilter/nf_conntrack_reasm.c of the component Netfilter Subsystem. The manipulation as part of a IPv6 Fragments leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The netfilter subsystem in the Linux kernel before 4.9 mishandles IPv6 reassembly, which allows local users to cause a denial of service (integer overflow, out-of-bounds write, and GPF) or possibly have unspecified other impact via a crafted application that makes socket, connect, and writev system calls, related to net/ipv6/netfilter/nf_conntrack_reasm.c and net/ipv6/netfilter/nf_defrag_ipv6_hooks.c.

The bug was discovered 12/28/2016. The weakness was presented 12/28/2016 (Website). The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2016-9755 since 12/01/2016. Local access is required to approach this attack. A authentication is required for exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 95685 (Fedora 25 : kernel (2016-bbe98c341c)), 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 276307 (Fedora Security Update for kernel (FEDORA-2016-bbe98c341c)).

Upgrading to version 4.9 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (95685) and SecurityFocus (BID 94626†). See VDB-94699 and VDB-94700 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

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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

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
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: 95685
Nessus Name: Fedora 25 : kernel (2016-bbe98c341c)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 55807
OpenVAS Name: Fedora Update for kernel FEDORA-2016-5ec2475e3f
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.9
Patch: git.kernel.org

Timelineinfo

12/01/2016 🔍
12/01/2016 +0 days 🔍
12/09/2016 +8 days 🔍
12/12/2016 +3 days 🔍
12/28/2016 +16 days 🔍
12/28/2016 +0 days 🔍
12/28/2016 +0 days 🔍
12/28/2016 +0 days 🔍
10/12/2022 +2114 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2016-bbe98c341c
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-9755 (🔍)
GCVE (CVE): GCVE-0-2016-9755
GCVE (VulDB): GCVE-100-94698
SecurityFocus: 94626 - Linux Kernel CVE-2016-9755 Out of Bounds Write Security Vulnerability

See also: 🔍

Entryinfo

Created: 12/28/2016 16:10
Updated: 10/12/2022 19:41
Changes: 12/28/2016 16:10 (77), 07/20/2019 09:20 (6), 10/12/2022 19:34 (4), 10/12/2022 19:41 (1)
Complete: 🔍
Cache ID: 216::103

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