Linux Kernel up to 4.11.9 Netlink Socket mq_notify use after free

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 4.11.9 and classified as critical. The impacted element is the function mq_notify of the component Netlink Socket Handler. Performing a manipulation results in use after free. This vulnerability is reported as CVE-2017-11176. The attack requires a local approach. Moreover, an exploit is present. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.11.9 (Operating System). It has been classified as critical. This affects the function mq_notify of the component Netlink Socket Handler. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The mq_notify function in the Linux kernel through 4.11.9 does not set the sock pointer to NULL upon entry into the retry logic. During a user-space close of a Netlink socket, it allows attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact.

The bug was discovered 07/09/2017. The weakness was disclosed 07/11/2017 as confirmed git commit (GIT Repository). It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2017-11176 since 07/11/2017. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 101994 (Fedora 24 : kernel (2017-544eef948f)), 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 276758 (Fedora Security Update for kernel (FEDORA-2017-544eef948f)).

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 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (45553), Tenable (101994) and SecurityFocus (BID 99919†). The entry VDB-104380 is pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

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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: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
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: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101994
Nessus Name: Fedora 24 : kernel (2017-544eef948f)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703926
OpenVAS Name: Debian Security Advisory DSA 3927-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: git.kernel.org

Timelineinfo

07/09/2017 🔍
07/09/2017 +0 days 🔍
07/11/2017 +2 days 🔍
07/11/2017 +0 days 🔍
07/11/2017 +0 days 🔍
07/12/2017 +1 days 🔍
07/26/2017 +14 days 🔍
07/27/2017 +1 days 🔍
12/28/2024 +2711 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2017-544eef948f
Researcher: GeneBlue
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-11176 (🔍)
GCVE (CVE): GCVE-0-2017-11176
GCVE (VulDB): GCVE-100-103407

OVAL: 🔍

SecurityFocus: 99919 - Linux kernel CVE-2017-11176 Local Denial of Service Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 07/12/2017 10:32
Updated: 12/28/2024 05:39
Changes: 07/12/2017 10:32 (82), 10/24/2019 17:57 (9), 12/31/2020 15:53 (2), 12/12/2022 09:51 (3), 12/12/2022 09:54 (1), 12/28/2024 05:39 (14)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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