Linux Kernel up to 4.16 XFS File System fs/xfs/libxfs/xfs_attr.c Attribute data processing

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

Summaryinfo

A vulnerability described as problematic has been identified in Linux Kernel up to 4.16. The impacted element is an unknown function in the library fs/xfs/libxfs/xfs_attr.c of the component XFS File System. The manipulation as part of Attribute results in data processing. This vulnerability is reported as CVE-2018-18690. The attack requires a local approach. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 4.16 (Operating System). Affected is an unknown code block in the library fs/xfs/libxfs/xfs_attr.c of the component XFS File System. The manipulation as part of a Attribute leads to a data processing vulnerability. CWE is classifying the issue as CWE-19. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel before 4.17, a local attacker able to set attributes on an xfs filesystem could make this filesystem non-operational until the next mount by triggering an unchecked error condition during an xfs attribute change, because xfs_attr_shortform_addname in fs/xfs/libxfs/xfs_attr.c mishandles ATTR_REPLACE operations with conversion of an attr from short to long form.

The bug was discovered 04/17/2018. The weakness was disclosed 10/26/2018 (Website). The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2018-18690 since 10/26/2018. The attack needs to be approached locally. The requirement for exploitation is a authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 192 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 118770 (Oracle Linux 7 : kernel (ELSA-2018-3083)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171708 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2018:3689-1)).

Upgrading to version 4.17 eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (118770) and SecurityFocus (BID 105753†). Once again VulDB remains the best source 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: Data processing
CWE: CWE-19
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: 118770
Nessus Name: Oracle Linux 7 : kernel (ELSA-2018-3083)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

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 4.17
Patch: git.kernel.org

Timelineinfo

04/17/2018 🔍
10/26/2018 +191 days 🔍
10/26/2018 +0 days 🔍
10/26/2018 +0 days 🔍
10/26/2018 +0 days 🔍
10/29/2018 +3 days 🔍
11/06/2018 +8 days 🔍
11/07/2018 +1 days 🔍
06/03/2023 +1669 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2018:3083
Status: Confirmed

CVE: CVE-2018-18690 (🔍)
GCVE (CVE): GCVE-0-2018-18690
GCVE (VulDB): GCVE-100-126012
SecurityFocus: 105753 - Linux Kernel 'xfs_attr.c' Local Denial of Service Vulnerability

Entryinfo

Created: 10/29/2018 13:39
Updated: 06/03/2023 09:56
Changes: 10/29/2018 13:39 (77), 04/07/2020 06:32 (4), 06/03/2023 09:51 (5), 06/03/2023 09:53 (1), 06/03/2023 09:56 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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