Linux Kernel up to 4.8.6 security/keys/big_key.c null pointer dereference

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.
7.6$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Linux Kernel up to 4.8.6. Affected is an unknown function of the file security/keys/big_key.c. The manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2016-9313. The attack needs to be performed locally. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.8.6 (Operating System). It has been rated as critical. This issue affects some unknown functionality of the file security/keys/big_key.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

security/keys/big_key.c in the Linux kernel before 4.8.7 mishandles unsuccessful crypto registration in conjunction with successful key-type registration, which allows local users to cause a denial of service (NULL pointer dereference and panic) or possibly have unspecified other impact via a crafted application that uses the big_key data type.

The bug was discovered 07/22/2016. The weakness was released 11/28/2016 by LINUX (Website). It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2016-9313 since 11/14/2016. Attacking locally is a requirement. A simple authentication is required for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 128 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 96000 (Ubuntu 16.10 : linux-raspi2 vulnerabilities (USN-3162-2)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196659 (Ubuntu Security Notification for Linux Vulnerabilities (USN-3162-1)).

Upgrading to version 4.8.7 eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (96000) and SecurityFocus (BID 94546†). Entry connected to this vulnerability is available at VDB-93614. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 96000
Nessus Name: Ubuntu 16.10 : linux-raspi2 vulnerabilities (USN-3162-2)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 841810
OpenVAS Name: Ubuntu Update for linux-raspi2 USN-3162-2
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Kernel 4.8.7
Patch: git.kernel.org

Timelineinfo

07/22/2016 🔍
11/14/2016 +115 days 🔍
11/27/2016 +13 days 🔍
11/27/2016 +0 days 🔍
11/28/2016 +1 days 🔍
11/28/2016 +0 days 🔍
12/20/2016 +22 days 🔍
12/21/2016 +1 days 🔍
10/04/2022 +2113 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-3162-2
Researcher: LINUX
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-9313 (🔍)
GCVE (CVE): GCVE-0-2016-9313
GCVE (VulDB): GCVE-100-93851
SecurityFocus: 94546 - Linux Kernel CVE-2016-9313 Null Pointer Deference Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 11/28/2016 09:32
Updated: 10/04/2022 15:21
Changes: 11/28/2016 09:32 (69), 06/11/2019 10:40 (15), 10/04/2022 15:15 (4), 10/04/2022 15:21 (1)
Complete: 🔍
Cache ID: 216:024:103

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!