Linux Kernel up to 4.11.3 mm/mlock.c __munlock_pagevec System Calls input validation

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

Summaryinfo

A vulnerability identified as problematic has been detected in Linux Kernel up to 4.11.3. The impacted element is the function __munlock_pagevec of the file mm/mlock.c. Performing a manipulation as part of System Calls results in input validation. This vulnerability is known as CVE-2017-18221. Attacking locally is a requirement. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 4.11.3 (Operating System). This affects the function __munlock_pagevec of the file mm/mlock.c. The manipulation as part of a System Calls leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. The summary by CVE is:

The __munlock_pagevec function in mm/mlock.c in the Linux kernel before 4.11.4 allows local users to cause a denial of service (NR_MLOCK accounting corruption) via crafted use of mlockall and munlockall system calls.

The bug was discovered 06/02/2017. The weakness was published 03/07/2018 (Website). The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2017-18221 since 03/07/2018. The exploitability is told to be easy. An attack has to be approached locally. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 278 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 108748 (SUSE SLES12 Security Update : kernel (SUSE-SU-2018:0848-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157889 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2019-4315)).

Upgrading to version 4.11.4 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 (108748) and SecurityFocus (BID 103321†). Similar entries are available at VDB-106966, VDB-112611, VDB-112680 and VDB-112681. 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: Input validation
CWE: CWE-20
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: 108748
Nessus Name: SUSE SLES12 Security Update : kernel (SUSE-SU-2018:0848-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53447
OpenVAS Name: Ubuntu Update for linux USN-3655-1
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 4.11.4
Patch: git.kernel.org

Timelineinfo

06/02/2017 🔍
03/07/2018 +278 days 🔍
03/07/2018 +0 days 🔍
03/07/2018 +0 days 🔍
03/07/2018 +0 days 🔍
03/07/2018 +0 days 🔍
03/29/2018 +22 days 🔍
03/30/2018 +1 days 🔍
02/17/2023 +1785 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 70feee0e1ef331b22cc51f383d532a0d043fbdcc
Status: Confirmed

CVE: CVE-2017-18221 (🔍)
GCVE (CVE): GCVE-0-2017-18221
GCVE (VulDB): GCVE-100-114165
SecurityFocus: 103321 - Linux Kernel 'mm/mlock.c' Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 03/07/2018 14:11
Updated: 02/17/2023 09:35
Changes: 03/07/2018 14:11 (80), 01/11/2020 08:51 (4), 02/17/2023 09:35 (6)
Complete: 🔍
Cache ID: 216:CAB:103

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