Improper privilege management in Linux kernel - CVE-2017-5551

Vulnerability identifier: #VU93742

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:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-5551

CWE-ID: CWE-269

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to read and manipulate data.

The vulnerability exists due to improperly imposed permissions within the simple_set_acl() function in fs/posix_acl.c. A local user can read and manipulate data.

Linux kernel
Ubuntu
Fedora
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gke (Ubuntu package)
linux-snapdragon (Ubuntu package)
kernel

Install update from vendor's website.

linux (Ubuntu package) - addressed in versions 4.4.0-67.88, 4.8.0-59.64
linux-aws (Ubuntu package) - update to 4.4.0-1009.18
linux-gke (Ubuntu package) - update to 4.4.0-1006.6
linux-snapdragon (Ubuntu package) - update to 4.4.0-1051.55
kernel - addressed in versions 4.9.6-100.fc24, 4.9.6-200.fc25

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=497de07d89c1410d76a15bec2bb41f24a2a89f31
• http://www.debian.org/security/2017/dsa-3791
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6
• http://www.openwall.com/lists/oss-security/2017/01/21/3
• http://www.securityfocus.com/bid/95717
• http://www.securitytracker.com/id/1038053
• https://bugzilla.redhat.com/show_bug.cgi?id=1416126
• https://github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f31

• Improper privilege management in Linux kernel fs
• Fedora 25 update for kernel
• Fedora 24 update for kernel
• Ubuntu update for linux, linux-aws, linux-gke and more
• Ubuntu update for linux, linux-raspi2