CVE-2018-1095

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. 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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

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

V2 Legend

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

13 Feb 2023, 04:53

Type Values Removed Values Added
Summary The Linux kernel is vulnerable to an out-of-bound access bug in the fs/posix_acl.c:get_acl() function. An attacker could trick a legitimate user or a privileged attacker could exploit this to cause a system crash or other unspecified impact with a crafted ext4 image. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely. 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.
References
  • {'url': 'https://access.redhat.com/security/cve/CVE-2018-1095', 'name': 'https://access.redhat.com/security/cve/CVE-2018-1095', 'tags': [], 'refsource': 'MISC'}

02 Feb 2023, 21:18

Type Values Removed Values Added
References
  • (MISC) https://access.redhat.com/security/cve/CVE-2018-1095 -
Summary 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. The Linux kernel is vulnerable to an out-of-bound access bug in the fs/posix_acl.c:get_acl() function. An attacker could trick a legitimate user or a privileged attacker could exploit this to cause a system crash or other unspecified impact with a crafted ext4 image. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.
Information

Published : 2018-04-02 03:29

Updated : 2023-12-10 12:30

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