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 5.5 MEDIUM
CVSS v2.0 7.1 HIGH

5.5^/10

CVSS v3 : 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
http://openwall.com/lists/oss-security/2018/03/29/1	Mailing List
https://access.redhat.com/errata/RHSA-2018:2948
https://bugzilla.kernel.org/show_bug.cgi?id=199185	Exploit Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1560793	Issue Tracking
https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401	Patch
https://usn.ubuntu.com/3695-1/
https://usn.ubuntu.com/3695-2/

Configurations

Configuration 1 (hide)

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

History

No history.

Information

Published : 2018-04-02 03:29

Updated : 2023-02-13 04:53

NVD link : CVE-2018-1095

Mitre link : CVE-2018-1095

CVE.ORG link : CVE-2018-1095

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-476

NULL Pointer Dereference

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