PT-2019-4770 · Linux+2 · Linux Kernel+2

Published 2019-04-16 · Updated 2023-01-17 · CVE-2019-15918

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.0.10

Description The issue is related to the SMB2 negotiate function in the Linux kernel, specifically in the fs/cifs/smb2pdu.c file. It involves an out-of-bounds read due to incompletely updated data structures after a change from smb30 to smb21. This can potentially allow an attacker to execute arbitrary code.

Recommendations For Linux kernel versions prior to 5.0.10, update to version 5.0.10 or later to resolve the issue. As a temporary workaround, consider restricting access to the SMB2 negotiate function until a patch is available.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

ALT-PU-2019-1762

ALT-PU-2019-1767

ALT-PU-2019-2701

ALT-PU-2019-2890

ALT-PU-2020-1024

ALT-PU-2020-2410

ALT-PU-2020-2433

BDU:2020-01342

CVE-2019-15918

USN-4162-1

USN-4162-2

Affected Products

Alt Linux

Linux Kernel

Ubuntu

References · 34

• https://github.com/torvalds/linux/commit/b57a55e2200ede754e4dc9cce4ba9402544b9365 · Patch
• https://security-tracker.debian.org/tracker/CVE-2019-15918 · Vendor Advisory
• https://usn.ubuntu.com/4162-2 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4162-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-14821 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-15918 · Security Note
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.10 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-15117 · Vendor Advisory
• https://osv.dev/vulnerability/USN-4162-2 · Vendor Advisory
• https://osv.dev/vulnerability/USN-4162-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-15918 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-15902 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-15118 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-14814 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-14816 · Vendor Advisory