PT-2018-1240 · Linux+2 · Linux Kernel+2

Wen Xu · Published 2018-03-29 · Updated 2023-02-13 · CVE-2018-1095

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions through 4.15.15

Description The issue is related to the ext4 xattr check entries function in the Linux kernel, which does not properly validate xattr sizes. This causes misinterpretation of a size as an error code, allowing attackers to cause a denial of service via a crafted ext4 image, resulting in a system crash due to a NULL pointer dereference.

Recommendations For Linux kernel versions through 4.15.15, update to a version that includes the fix for the ext4 xattr check entries function issue to prevent denial of service attacks.

Exploit

Fix

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2018-1557

ALT-PU-2018-1621

ALT-PU-2019-1433

BDU:2018-00713

CVE-2018-1095

MGASA-2018-0249

MGASA-2018-0264

MGASA-2018-0265

RHSA-2018:2948

USN-3695-1

USN-3695-2

Affected Products

Alt Linux

Linux Kernel

Ubuntu

References · 63

• 🔥 https://bugzilla.kernel.org/show_bug.cgi?id=199185 · Exploit
• https://osv.dev/vulnerability/MGASA-2018-0265 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2018-0264 · Vendor Advisory
• https://usn.ubuntu.com/3695-2 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-1095 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2018-1095 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-10940 · Vendor Advisory
• https://bdu.fstec.ru/vul/2018-00713 · Security Note
• https://advisories.mageia.org/MGASA-2018-0264.html · Security Note
• https://ubuntu.com/security/CVE-2018-1094 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3695-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-7755 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2018-1095 · Security Note
• https://usn.ubuntu.com/3695-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-1095 · Security Note