Linux Kernel up to 4.20.13 Capability Check mm/mmap.c null pointer dereference

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5.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 4.20.13. Affected by this issue is some unknown functionality of the file mm/mmap.c of the component Capability Check. The manipulation leads to null pointer dereference. This vulnerability is listed as CVE-2019-9213. The attack must be carried out locally. In addition, an exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.20.13 (Operating System). It has been rated as problematic. This issue affects an unknown functionality of the file mm/mmap.c of the component Capability Check. 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:

In the Linux kernel before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum address, which makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task.

The bug was discovered 03/06/2019. The weakness was presented 03/05/2019 as openSUSE-SU-2019:1085-1 (Website). It is possible to read the advisory at securityfocus.com. The identification of this vulnerability is CVE-2019-9213 since 02/27/2019. The exploitation is known to be easy. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277738 (Fedora Security Update for kernel kernel-headers (FEDORA-2019-196ab64d65)).

Upgrading to version 4.20.14 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 107296†). See VDB-136769 for similar entry. 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: 5.4
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.20.14
Patch: git.kernel.org

Timelineinfo

02/27/2019 🔍
03/05/2019 +6 days 🔍
03/06/2019 +1 days 🔍
03/06/2019 +0 days 🔍
03/06/2019 +0 days 🔍
12/22/2024 +2118 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: openSUSE-SU-2019:1085-1⛔
Status: Confirmed

CVE: CVE-2019-9213 (🔍)
GCVE (CVE): GCVE-0-2019-9213
GCVE (VulDB): GCVE-100-131363
SecurityFocus: 107296 - Linux kernel CVE-2019-9213 Local Denial of Service Vulnerability

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

Entryinfo

Created: 03/06/2019 08:51
Updated: 12/22/2024 07:38
Changes: 03/06/2019 08:51 (65), 06/27/2020 12:28 (4), 07/26/2023 17:06 (5), 12/22/2024 07:38 (23)
Complete: 🔍
Cache ID: 216::103

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