Security restrictions bypass in Linux kernel - CVE-2017-17448

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Main Vulnerability Database Vulnerabilities #VU9768

Security restrictions bypass in Linux kernel - CVE-2017-17448

Published: December 26, 2017


Vulnerability identifier: #VU9768
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-17448
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local attacker to bypass security restrictions on the target system.

The weakness exists due to net/netfilter/nfnetlink_cthelper.c in the Linux kernel does not require the CAP_NET_ADMIN capability for new, get, and del operations. A local attacker can bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.

Affected software

Linux kernel
Debian Linux
Amazon Linux AMI
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux for Real Time
SUSE Linux
Fedora

kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-alt (Red Hat package)
kernel
Red Hat Virtualization Host

How to mitigate CVE-2017-17448

Update to version 4.14.4.

kernel (Red Hat package) - update to 3.10.0-862.el7
kernel-rt (Red Hat package) - update to 3.10.0-862.rt56.804.el7
kernel-alt (Red Hat package) - update to 4.14.0-49.el7a
kernel - addressed in versions 4.14.6-200.fc26, 4.14.6-300.fc27

External References

Related Security Bulletins