CVE-2018-1095

MEDIUM
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Description

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

http://openwall.com/lists/oss-security/2018/03/29/1

https://access.redhat.com/errata/RHSA-2018:2948

https://bugzilla.kernel.org/show_bug.cgi?id=199185

https://bugzilla.redhat.com/show_bug.cgi?id=1560793

https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401

https://usn.ubuntu.com/3695-1/

https://usn.ubuntu.com/3695-2/

Details

Source: MITRE

Published: 2018-04-02

Updated: 2018-10-31

Type: CWE-476

Risk Information

CVSS v2

Base Score: 7.1

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

Impact Score: 6.9

Exploitability Score: 8.6

Severity: HIGH

CVSS v3

Base Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to 4.15.15 (inclusive)

Tenable Plugins

View all (6 total)

IDNameProductFamilySeverity
124984EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1531)NessusHuawei Local Security Checks
high
118513RHEL 7 : kernel-alt (RHSA-2018:2948) (Spectre)NessusRed Hat Local Security Checks
high
111267Ubuntu 16.04 LTS : Linux kernel (HWE) regression (USN-3718-2)NessusUbuntu Local Security Checks
medium
111266Ubuntu 18.04 LTS : Linux kernel regression (USN-3718-1)NessusUbuntu Local Security Checks
medium
110895Ubuntu 16.04 LTS : linux-hwe, linux-azure vulnerabilities (USN-3695-2)NessusUbuntu Local Security Checks
medium
110894Ubuntu 18.04 LTS : linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities (USN-3695-1)NessusUbuntu Local Security Checks
medium