Linux Kernel up to 5.0.5 fs/proc/proc_sysctl.c drop_sysctl_table null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Kernel up to 5.0.5. Affected by this vulnerability is the function drop_sysctl_table of the file fs/proc/proc_sysctl.c. The manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2019-20054. The attack needs to be performed locally. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.0.5 (Operating System). It has been rated as problematic. This issue affects the function drop_sysctl_table of the file fs/proc/proc_sysctl.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 availability. The summary by CVE is:

In the Linux kernel before 5.0.6, there is a NULL pointer dereference in drop_sysctl_table() in fs/proc/proc_sysctl.c, related to put_links, aka CID-23da9588037e.

The weakness was released 12/28/2019. The identification of this vulnerability is CVE-2019-20054 since 12/28/2019. The exploitation is known to be easy. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 208557 (CentOS 7 : kernel-alt (RHSA-2020:1493)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.0.6 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (208557). 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: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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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: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 208557
Nessus Name: CentOS 7 : kernel-alt (RHSA-2020:1493)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.0.6
Patch: git.kernel.org

Timelineinfo

12/28/2019 🔍
12/28/2019 +0 days 🔍
12/28/2019 +0 days 🔍
10/15/2024 +1753 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: cdn.kernel.org
Status: Not defined

CVE: CVE-2019-20054 (🔍)
GCVE (CVE): GCVE-0-2019-20054
GCVE (VulDB): GCVE-100-147851

Entryinfo

Created: 12/28/2019 12:08
Updated: 10/15/2024 19:18
Changes: 12/28/2019 12:08 (39), 12/28/2019 12:13 (18), 03/18/2024 09:11 (19), 10/15/2024 19:18 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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