Stack-based buffer overflow in Linux kernel - CVE-2018-14633

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Main Vulnerability Database Vulnerabilities #VU14920

Stack-based buffer overflow in Linux kernel - CVE-2018-14633

Published: September 29, 2018 / Updated: October 23, 2018


Vulnerability identifier: #VU14920
CSH Severity: Medium
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-14633
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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.

Affected software

Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
Fedora
Opensuse

kernel (Red Hat package)
kernel-rt (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel
kernel-headers
kernel-tools
Dell EMC Data Protection Search

How to mitigate CVE-2018-14633

Install updated from vendor's repository.

Linux kernel - addressed in versions 4.4.159, 4.9.130, 4.14.73, 4.18.11, 4.19
kernel (Red Hat package) - update to 3.10.0-693.55.1.el7
kernel-rt (Red Hat package) - update to 3.10.0-957.1.3.rt56.913.el7
kernel - addressed in versions 4.18.10-100.fc27, 4.18.10-200.fc28, 4.18.10-300.fc29
kernel-headers - addressed in versions 4.18.10-100.fc27, 4.18.10-200.fc28, 4.18.10-300.fc29
kernel-tools - addressed in versions 4.18.10-100.fc27, 4.18.10-200.fc28, 4.18.10-300.fc29
Dell EMC Data Protection Search - update to 18.2.1

External References

Related Security Bulletins