Linux Kernel up to 5.1-rc4 RAM fs/fuse/dev.c Request use after free

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.1-rc4. It has been classified as critical. This affects an unknown function of the file fs/fuse/dev.c of the component RAM. This manipulation as part of Request causes use after free. The identification of this vulnerability is CVE-2019-11487. The attack can only be executed locally. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.1-rc4 (Operating System). It has been declared as critical. Affected by this vulnerability is an unknown code block of the file fs/fuse/dev.c of the component RAM. The manipulation as part of a Request leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The Linux kernel before 5.1-rc5 allows page->_refcount reference count overflow, with resultant use-after-free issues, if about 140 GiB of RAM exists. This is related to fs/fuse/dev.c, fs/pipe.c, fs/splice.c, include/linux/mm.h, include/linux/pipe_fs_i.h, kernel/trace/trace.c, mm/gup.c, and mm/hugetlb.c. It can occur with FUSE requests.

The bug was discovered 01/09/2019. The weakness was shared 04/23/2019 (Website). It is possible to read the advisory at securityfocus.com. This vulnerability is known as CVE-2019-11487 since 04/23/2019. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. 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 104 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 208598 (CentOS 7 : kernel (RHSA-2020:0834)), which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172478 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2019:1536-1) (Sad SACK)).

Upgrading to version 5.1-rc5 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (208598) and SecurityFocus (BID 108488†). The entries VDB-132474, VDB-133998, VDB-135204 and VDB-135656 are related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
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: 208598
Nessus Name: CentOS 7 : kernel (RHSA-2020:0834)

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.1-rc5
Patch: git.kernel.org

Timelineinfo

01/09/2019 🔍
04/23/2019 +104 days 🔍
04/23/2019 +0 days 🔍
04/24/2019 +1 days 🔍
05/14/2019 +20 days 🔍
10/14/2024 +1980 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2019:2703⛔
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-11487 (🔍)
GCVE (CVE): GCVE-0-2019-11487
GCVE (VulDB): GCVE-100-133999
SecurityFocus: 108488 - Linux Kernel CVE-2019-11085 Local Privilege Escalation Vulnerability

See also: 🔍

Entryinfo

Created: 04/24/2019 11:30
Updated: 10/14/2024 15:17
Changes: 04/24/2019 11:30 (65), 06/01/2020 16:36 (5), 09/06/2023 17:14 (5), 10/14/2024 15:17 (16)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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