Linux Kernel up to 4.17.3 xfs_inode_buf.c null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 4.17.3. Impacted is an unknown function in the library fs/xfs/libxfs/xfs_inode_buf.c. Executing a manipulation can lead to null pointer dereference. This vulnerability is tracked as CVE-2018-13095. The attack is restricted to local execution. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.17.3 (Operating System). It has been declared as critical. This vulnerability affects an unknown code block in the library fs/xfs/libxfs/xfs_inode_buf.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in fs/xfs/libxfs/xfs_inode_buf.c in the Linux kernel through 4.17.3. A denial of service (memory corruption and BUG) can occur for a corrupted xfs image upon encountering an inode that is in extent format, but has more extents than fit in the inode fork.

The bug was discovered 06/21/2018. The weakness was disclosed 07/03/2018 (Website). The advisory is available at bugzilla.kernel.org. This vulnerability was named CVE-2018-13095 since 07/03/2018. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 12 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 111243 (Fedora 27 : kernel (2018-8484550fff)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171490 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2018:2776-1)).

Upgrading 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 (111243) and SecurityFocus (BID 105154†). The entries VDB-120148, VDB-120200, VDB-120201 and VDB-121903 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

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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: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 111243
Nessus Name: Fedora 27 : kernel (2018-8484550fff)
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: 🔍

Patch: git.kernel.org

Timelineinfo

06/21/2018 🔍
07/03/2018 +11 days 🔍
07/03/2018 +0 days 🔍
07/03/2018 +0 days 🔍
07/03/2018 +0 days 🔍
07/13/2018 +10 days 🔍
07/24/2018 +11 days 🔍
08/27/2018 +34 days 🔍
03/29/2023 +1675 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2018-8484550fff
Status: Confirmed

CVE: CVE-2018-13095 (🔍)
GCVE (CVE): GCVE-0-2018-13095
GCVE (VulDB): GCVE-100-120202
SecurityFocus: 105154 - Linux Kernel 'net/ipv4/cipso_ipv4.c' Remote Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 07/03/2018 17:47
Updated: 03/29/2023 18:13
Changes: 07/03/2018 17:47 (75), 02/24/2020 10:01 (5), 03/29/2023 18:05 (5), 03/29/2023 18:13 (1)
Complete: 🔍
Cache ID: 216:88D:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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