CVE-2018-12232

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.

CVSS v3.0 5.9 MEDIUM
CVSS v2.0 7.1 HIGH

5.9^/10

CVSS v3.0 : MEDIUM

Vector : AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

7.1^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:M/Au:N/C:N/I:N/A:C

Exploitability : 8.6 / Impact : 6.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact COMPLETE

References

Link	Resource
https://patchwork.ozlabs.org/patch/926519/	Patch Third Party Advisory
https://lkml.org/lkml/2018/6/5/14	Third Party Advisory
https://github.com/torvalds/linux/commit/6d8c50dcb029872b298eea68cc6209c866fd3e14	Patch Third Party Advisory
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6d8c50dcb029872b298eea68cc6209c866fd3e14	Patch Third Party Advisory
http://www.securityfocus.com/bid/104453	Third Party Advisory VDB Entry
https://usn.ubuntu.com/3752-2/
https://usn.ubuntu.com/3752-1/
https://usn.ubuntu.com/3752-3/
https://access.redhat.com/errata/RHSA-2018:2948

Advertisement

Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Information

Published : 2018-06-12 05:29

Updated : 2018-10-31 03:30

NVD link : CVE-2018-12232

Mitre link : CVE-2018-12232

JSON object : View

CWE

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Advertisement

Products Affected

linux

linux_kernel

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://patchwork.ozlabs.org/patch/926519/", "name": "https://patchwork.ozlabs.org/patch/926519/", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "https://lkml.org/lkml/2018/6/5/14", "name": "https://lkml.org/lkml/2018/6/5/14", "tags": ["Third Party Advisory"], "refsource": "MISC"}, {"url": "https://github.com/torvalds/linux/commit/6d8c50dcb029872b298eea68cc6209c866fd3e14", "name": "https://github.com/torvalds/linux/commit/6d8c50dcb029872b298eea68cc6209c866fd3e14", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6d8c50dcb029872b298eea68cc6209c866fd3e14", "name": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6d8c50dcb029872b298eea68cc6209c866fd3e14", "tags": ["Patch", "Third Party Advisory"], "refsource": "MISC"}, {"url": "http://www.securityfocus.com/bid/104453", "name": "104453", "tags": ["Third Party Advisory", "VDB Entry"], "refsource": "BID"}, {"url": "https://usn.ubuntu.com/3752-2/", "name": "USN-3752-2", "tags": [], "refsource": "UBUNTU"}, {"url": "https://usn.ubuntu.com/3752-1/", "name": "USN-3752-1", "tags": [], "refsource": "UBUNTU"}, {"url": "https://usn.ubuntu.com/3752-3/", "name": "USN-3752-3", "tags": [], "refsource": "UBUNTU"}, {"url": "https://access.redhat.com/errata/RHSA-2018:2948", "name": "RHSA-2018:2948", "tags": [], "refsource": "REDHAT"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-362"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2018-12232", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 7.1, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "MEDIUM", "availabilityImpact": "COMPLETE", "confidentialityImpact": "NONE"}, "severity": "HIGH", "impactScore": 6.9, "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.2}}, "publishedDate": "2018-06-12T12:29Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "4.17.1"}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2018-10-31T10:30Z"}