Linux Kernel up to 4.17.1 net/socket.c race condition

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.17.1. It has been rated as problematic. This affects an unknown part of the file net/socket.c. Performing a manipulation results in race condition. This vulnerability is known as CVE-2018-12232. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 4.17.1 (Operating System). This affects an unknown function of the file net/socket.c. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on availability. The summary by CVE is:

In net/socket.c in the Linux kernel through 4.17.1, there is a race condition between fchownat and close in cases where they target the same socket file descriptor, related to the sock_close and sockfs_setattr functions. fchownat does not increment the file descriptor reference count, which allows close to set the socket to NULL during fchownat's execution, leading to a NULL pointer dereference and system crash.

The bug was discovered 06/07/2018. The weakness was published 06/12/2018 (Website). The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2018-12232 since 06/12/2018. It is possible to initiate the attack remotely. 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 5 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 110671 (Fedora 27 : kernel (2018-c449dc1c9c)), 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 171998 (OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2019:0065-1)).

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 (110671) and SecurityFocus (BID 104453†). Similar entries are available at VDB-63774, VDB-127475, VDB-127693 and VDB-127910. 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: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 110671
Nessus Name: Fedora 27 : kernel (2018-c449dc1c9c)
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

06/04/2018 🔍
06/07/2018 +3 days 🔍
06/12/2018 +4 days 🔍
06/12/2018 +0 days 🔍
06/12/2018 +0 days 🔍
06/12/2018 +0 days 🔍
06/22/2018 +10 days 🔍
06/25/2018 +3 days 🔍
03/22/2023 +1731 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2018-c449dc1c9c
Status: Confirmed

CVE: CVE-2018-12232 (🔍)
GCVE (CVE): GCVE-0-2018-12232
GCVE (VulDB): GCVE-100-119385
SecurityFocus: 104453 - Linux Kernel CVE-2018-12232 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 06/12/2018 21:45
Updated: 03/22/2023 15:30
Changes: 06/12/2018 21:45 (75), 02/18/2020 11:44 (5), 03/22/2023 15:24 (5), 03/22/2023 15:30 (1)
Complete: 🔍
Cache ID: 216:43A:103

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

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