Linux Kernel up to 4.17.3 xfs_attr_leaf.c xfs_da_shrink_inode null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Kernel up to 4.17.3. This issue affects the function xfs_da_shrink_inode in the library fs/xfs/libxfs/xfs_attr_leaf.c. Performing a manipulation results in null pointer dereference. This vulnerability is identified as CVE-2018-13094. The attack is only possible with local access. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.17.3 (Operating System). It has been classified as problematic. This affects the function xfs_da_shrink_inode in the library fs/xfs/libxfs/xfs_attr_leaf.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

An issue was discovered in fs/xfs/libxfs/xfs_attr_leaf.c in the Linux kernel through 4.17.3. An OOPS may occur for a corrupted xfs image after xfs_da_shrink_inode() is called with a NULL bp.

The bug was discovered 06/08/2018. The weakness was released 07/03/2018 (Website). The advisory is shared at bugzilla.kernel.org. This vulnerability is uniquely identified as CVE-2018-13094 since 07/03/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 25 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†). Entries connected to this vulnerability are available at VDB-120148, VDB-120200, VDB-120202 and VDB-121903. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
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: 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

06/08/2018 🔍
07/03/2018 +24 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-2018-13094 (🔍)
GCVE (CVE): GCVE-0-2018-13094
GCVE (VulDB): GCVE-100-120201
SecurityFocus: 105154 - Linux Kernel 'net/ipv4/cipso_ipv4.c' Remote Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 07/03/2018 17:46
Updated: 03/29/2023 17:57
Changes: 07/03/2018 17:46 (76), 02/24/2020 09:54 (5), 03/29/2023 17:49 (5), 03/29/2023 17:57 (1)
Complete: 🔍
Cache ID: 216:126:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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