CVE-2018-1095

The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl NULL pointer dereference and system crash) via a crafted ext4 image.

CVSS v3.0 5.5 MEDIUM
CVSS v2.0 7.1 HIGH

5.5^/10

CVSS v3.0 : MEDIUM

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

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

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://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401	Patch
https://bugzilla.redhat.com/show_bug.cgi?id=1560793	Issue Tracking
https://bugzilla.kernel.org/show_bug.cgi?id=199185	Exploit Issue Tracking
http://openwall.com/lists/oss-security/2018/03/29/1	Mailing List
https://usn.ubuntu.com/3695-2/
https://usn.ubuntu.com/3695-1/
https://access.redhat.com/errata/RHSA-2018:2948

Advertisement

Configurations

Configuration 1 (hide)

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

Information

Published : 2018-04-01 20:29

Updated : 2023-02-12 20:53

NVD link : CVE-2018-1095

Mitre link : CVE-2018-1095

JSON object : View

CWE

CWE-476

NULL Pointer Dereference

Advertisement

Products Affected

linux

linux_kernel

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401", "name": "https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401", "tags": ["Patch"], "refsource": "MISC"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1560793", "name": "https://bugzilla.redhat.com/show_bug.cgi?id=1560793", "tags": ["Issue Tracking"], "refsource": "MISC"}, {"url": "https://bugzilla.kernel.org/show_bug.cgi?id=199185", "name": "https://bugzilla.kernel.org/show_bug.cgi?id=199185", "tags": ["Exploit", "Issue Tracking"], "refsource": "MISC"}, {"url": "http://openwall.com/lists/oss-security/2018/03/29/1", "name": "http://openwall.com/lists/oss-security/2018/03/29/1", "tags": ["Mailing List"], "refsource": "MISC"}, {"url": "https://usn.ubuntu.com/3695-2/", "name": "USN-3695-2", "tags": [], "refsource": "UBUNTU"}, {"url": "https://usn.ubuntu.com/3695-1/", "name": "USN-3695-1", "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": "The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl NULL pointer dereference and system crash) via a crafted ext4 image."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-476"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2018-1095", "ASSIGNER": "secalert@redhat.com"}}, "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": true}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}}, "publishedDate": "2018-04-02T03:29Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "4.15.15"}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2023-02-13T04:53Z"}