PT-2017-3589 · Linux+5 · Linux Kernel+5

Dan Aloni · Published 2017-02-01 · Updated 2019-04-23 · CVE-2018-1066

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 prior to 4.11

Description: The issue is related to a NULL pointer dereference in the setup ntlmv2 rsp() function, located in fs/cifs/cifsencrypt.c. This occurs when an empty TargetInfo field in an NTLMSSP setup negotiation response is mishandled during session recovery. An attacker controlling a CIFS server can exploit this to cause a kernel panic on a client system that has the server mounted. The vulnerability allows a remote attacker to trigger a kernel panic on a vulnerable system when it connects to a controlled CIFS resource.

Recommendations: For Linux kernel versions prior to 4.11, update to version 4.11 or later to resolve the issue. As a temporary workaround, consider restricting access to CIFS servers to minimize the risk of exploitation. Avoid using the setup ntlmv2 rsp() function until a patch is available.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2017-1617

ALT-PU-2018-1991

BDU:2018-00526

CESA-2018_1062

CVE-2018-1066

DLA-1422-1

DLA-1422-2

DSA-4187-1

DSA-4188-1

RHSA-2018:1062

RHSA-2018_1062

SUSE-SU-2018:0834-1

SUSE-SU-2018:0848-1

USN-3880-1

USN-3880-2

Affected Products

Alt Linux

Centos

Linux Kernel

Red Hat

Suse

Ubuntu

References · 96

• https://github.com/torvalds/linux/commit/cabfb3680f78981d26c078a26e5c748531257ebb · Patch
• https://usn.ubuntu.com/3880-1 · Vendor Advisory
• https://patchwork.kernel.org/patch/10187633 · Patch
• https://debian.org/security/2018/dsa-4187 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2018-1066 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3880-1 · Vendor Advisory
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cabfb3680f78981d26c078a26e5c748531257ebb · Vendor Advisory
• https://bdu.fstec.ru/vul/2018-00526 · Security Note
• https://usn.ubuntu.com/3880-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-17972 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-18281 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-1066 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2019-4596.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-9568 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4188-1 · Vendor Advisory