PT-2016-4068 · Red Hat+4 · Ceph+6

Laurent Guerby · Published 2016-06-22 · Updated 2018-03-16 · CVE-2015-8952

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 4.6

Description The issue is related to the mbcache feature in the ext2 and ext4 filesystem implementations. It mishandles xattr block caching, allowing local users to cause a denial of service (soft lockup) via filesystem operations in environments that use many attributes. This is demonstrated by systems using Ceph and Samba.

Recommendations For Linux kernel versions prior to 4.6, update to version 4.6 or later to resolve the issue. As a temporary workaround, consider restricting the use of many attributes in filesystem operations to minimize the risk of exploitation.

Exploit

Fix

DoS

Weakness Enumeration

CWE-19

Related Identifiers

ALT-PU-2016-1634

ALT-PU-2017-1330

CVE-2015-8952

USN-3582-1

USN-3582-2

Affected Products

Alt Linux

Ceph

Linux Kernel

Samba

Ubuntu

Ext2

Ext4

References · 35

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/netfilter_priv_esc_ipv4.rb · Exploit
• 🔥 https://github.com/qazbnm456/awesome-cve-poc/blob/master/CVE-2017-5715.md · Exploit
• 🔥 https://github.com/opsxcq/exploit-cve-2017-5715 · Exploit
• 🔥 https://github.com/wpengfei/CVE-2016-6516-exploit · Exploit
• https://github.com/torvalds/linux/commit/82939d7999dfc1f1998c4b1c12e2f19edbdff272 · Vendor Advisory
• https://github.com/torvalds/linux/commit/be0726d33cb8f411945884664924bed3cb8c70ee · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2015-8952 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3582-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-17712 · Vendor Advisory
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=82939d7999dfc1f1998c4b1c12e2f19edbdff272 · Patch
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=be0726d33cb8f411945884664924bed3cb8c70ee · Patch
• https://usn.ubuntu.com/3582-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-8824 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-15115 · Vendor Advisory
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f9a61eb4e2471c56a63cd804c7474128138c38ac · Patch