Access Restriction Bypass Affecting perf package, versions <0:2.6.32-220.13.1.el6


Severity

Recommended
medium

Based on CentOS security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-CENTOS6-PERF-2056104
  • published26 Jul 2021
  • disclosed23 Mar 2011

Introduced: 23 Mar 2011

CVE-2011-4080  (opens in a new tab)
CWE-264  (opens in a new tab)

How to fix?

Upgrade Centos:6 perf to version 0:2.6.32-220.13.1.el6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by Centos. See How to fix? for Centos:6 relevant fixed versions and status.

The sysrq_sysctl_handler function in kernel/sysctl.c in the Linux kernel before 2.6.39 does not require the CAP_SYS_ADMIN capability to modify the dmesg_restrict value, which allows local users to bypass intended access restrictions and read the kernel ring buffer by leveraging root privileges, as demonstrated by a root user in a Linux Containers (aka LXC) environment.

CVSS Scores

version 3.1