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-$5k	0.00

A vulnerability was found in Linux Kernel up to 4.12.9 (Operating System). It has been rated as critical. Affected by this issue is the function mm_init of the file kernel/fork.c of the component Crafted Program. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The mm_init function in kernel/fork.c in the Linux kernel before 4.12.10 does not clear the ->exe_file member of a new process's mm_struct, allowing a local attacker to achieve a use-after-free or possibly have unspecified other impact by running a specially crafted program.

The bug was discovered 08/25/2017. The weakness was disclosed 11/29/2017 as confirmed git commit (GIT Repository). The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2017-17052 since 11/28/2017. Local access is required to approach this attack. A simple authentication is required for exploitation. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 95 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 109008 (Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4062)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157673 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2018-4062)).

Upgrading to version 4.12.10 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. A possible mitigation has been published 5 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (109008) and SecurityFocus (BID 102009†). The entry VDB-102802 is pretty similar.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.12.0
• 4.12.1
• 4.12.2
• 4.12.3
• 4.12.4
• 4.12.5
• 4.12.6
• 4.12.7
• 4.12.8
• 4.12.9

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 109008
Nessus Name: Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4062)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Kernel 4.12.10
Patch: git.kernel.org

Timelineinfo

08/25/2017 🔍
11/28/2017 +95 days 🔍
11/28/2017 +0 days 🔍
11/28/2017 +0 days 🔍
11/29/2017 +1 days 🔍
11/29/2017 +0 days 🔍
04/11/2018 +133 days 🔍
04/12/2018 +1 days 🔍
01/16/2023 +1740 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 2b7e8665b4ff51c034c55df3cff76518d1a9ee3a
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-17052 (🔍)
SecurityFocus: 102009 - Linux Kernel 'kernel/fork.c' Local Use After Free Memory Corruption Vulnerability

See also: 🔍

Entryinfo

Created: 11/29/2017 07:24 PM
Updated: 01/16/2023 02:25 PM
Changes: 11/29/2017 07:24 PM (74), 12/11/2019 08:48 AM (10), 01/16/2023 02:25 PM (4)
Complete: 🔍
Cache ID: 18:D1C:40

Discussion

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