Stack-based buffer overflow in Linux kernel

#VU14920 Stack-based buffer overflow in Linux kernel

Published: 2018-09-29 | Updated: 2018-10-23

Vulnerability identifier: #VU14920

Vulnerability risk: Medium

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-14633

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing client digest packets in chap_server_compute_md5() function when processing authentication request from an ISCSI initiator. A remote attacker can send an overly long value (longer than 32 bytes), trigger stack-based buffer overflow and execute arbitrary code on the target system.

Mitigation
Install updated from vendor's repository.

Vulnerable software versions

Linux kernel: 4.14 - 4.14.72, 4.18 - 4.18.15, 4.4.0 - 4.4.158, 4.9.1 - 4.9.129

External links
http://seclists.org/oss-sec/2018/q3/270
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.73
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.11
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.159
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.130
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Latest bulletins with this vulnerability

Multiple vulnerabilities in Dell EMC Search

Red Hat update for kernel

OpenSUSE Linux update for the Linux Kernel

Amazon Linux AMI update for kernel