Security restrictions bypass in Linux kernel - CVE-2017-17450

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Main Vulnerability Database Vulnerabilities #VU9770

Security restrictions bypass in Linux kernel - CVE-2017-17450

Published: December 26, 2017


Vulnerability identifier: #VU9770
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-2017-17450
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/xt_osf.c in the Linux kernel through does not require the CAP_NET_ADMIN capability for add_callback and remove_callback operations. A local attacker can bypass intended access restrictions because the xt_osf_fingers data structure is shared across all net namespaces.

Affected software

Linux kernel
Debian Linux
Amazon Linux AMI
SUSE Linux
Ubuntu
Fedora
kernel

How to mitigate CVE-2017-17450

Update to version 4.14.4.

kernel - addressed in versions 4.14.6-200.fc26, 4.14.6-300.fc27

External References

Related Security Bulletins